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Unmounted Longpass Colored Glass Filters


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Longpass Filter Selection
Ø25 mm2" x 2"6" x 6"Longpass Region
FGL280aFGL280S 280 - 1800 nm
FGL400aFGL400S 400 - 1800 nm
FGL420  420 - 2500 nm
FGL435aFGL435S 435 - 1800 nm
FGL455  460 - 2500 nm
FGL495aFGL495S 495 - 1800 nm
FGL515aFGL515S 515 - 1800 nm
FGL530  530 - 2500 nm
FGL550aFGL550S 550 - 1800 nm
FGL570  570 - 2500 nm
FGL590aFGL590S 590 - 1800 nm
FGL610aFGL610SFGL610H610 - 1800 nm
FGL630  630 - 2500 nm
FGL645  650 - 2500 nm
FGL665aFGL665S 665 - 1800 nm
FGL695  700 - 2500 nm
FGL715aFGL715S 715 - 1800 nm
FGL9  721 - 1035 nm
FGL780aFGL780SFGL780H780 - 1800 nm
FGL830  830 - 2500 nm
FGL850aFGL850SFGL850H850 - 1800 nm
FGL1000aFGL1000S 1000 - 1800 nm
  • These filters are also available in a mounted version.

Features

  • Longpass Region Cut-On Options Available from 280 to 1000 nm
  • Ø25 mm Rounds, 2" x 2" Squares, or 6" x 6" Squares
  • Kits Include Selected Longpass and Bandpass Filters
  • Edge Blackening of Unmounted Filters Available Upon Request

These longpass colored glass filters are manufactured from different colors of Schott glass and are intended for use in a wide variety of applications. In addition to the longpass filters offered here, Thorlabs also offers a series of bandpass colored glass filters. In either case, the filters are available in both round and square varieties. The 25 mm round filters will fit into our manual or motorized filter wheels; alternatively, they can be mounted in a lens tube. A selection of Ø25 mm filters is available premounted. To mount the 2" x 2" square filters, choose from our selection of fixed filter holders. For the 6" x 6" filter, we recommend the FP02 Plate Holder.

Several of the colored glasses used for our filters are fluorescent at certain wavelengths; for more details on how this may affect certain applications, contact Technical Support. For narrowband sources, we recommend our dielectric edgepass filters.

Colored Glass Filter Kits
Thorlabs also offers two filter kits containing our most popular bandpass and longpass filters. For specific product details, please see the bottom of the page.

Storage Boxes
If you purchase individual filters and would like to have a safe, convenient way to store them when not in use, consider our storage boxes. These are the same storage boxes that our kit filters arrive in. There is one box (KT01) designed for mounted Ø25 mm filters and a second (KT03) for the unmounted 2" x 2" filters.

 

Colored Glass Selection Guide
BandpassLongpass
MountedUnmountedAR CoatedMountedUnmounted
Colored Filter Dimensions
General Specifications
MaterialSchott Colored Glass
SizeØ25 mm2" x 2"6" x 6"
Thickness2 mm3 mm
Surface Quality40-20 Scratch-Dig
Surface Flatness<λ @ 632.8 nm<λ @ 632.8 nm
over 1"
<λ @ 632.8 nm
over 1"
Tolerance+0.0/-0.4 mm (Diameter)+0.0/-0.4 mm
(Length and Width of Square Filter)
Wedge<3 arcmin<5 arcmin
Damage Threshold 30 W/cm2 (Typical)
Clear Aperture80% of Diameter 80% of Length and Width
Item #
(Ø25 mm)
Item #
(2" Square)
Item #
(6" Square)
Schott
Glass
Description
FGL280aFGL280S N-WG280280 nm Longpass
FGL400aFGL400S GG400400 nm Longpass
FGL420  GG420420 nm Longpass
FGL435aFGL435S GG435435 nm Longpass
FGL455  GG455460 nm Longpass
FGL495aFGL495S GG495495 nm Longpass
FGL515aFGL515S OG515515 nm Longpass
FGL530  OG530530 nm Longpass
FGL550aFGL550S OG550550 nm Longpass
FGL570  OG570570 nm Longpass
FGL590aFGL590S OG590590 nm Longpass
FGL610aFGL610SFGL610HRG610610 nm Longpass
FGL630  RG630630 nm Longpass
FGL645  RG645650 nm Longpass
FGL665aFGL665S RG665665 nm Longpass
FGL695  RG695700 nm Longpass
FGL715aFGL715S RG715715 nm Longpass
FGL9  RG9721 nm Longpass
FGL780aFGL780SFGL780HRG780780 nm Longpass
FGL830  RG830830 nm Longpass
FGL850aFGL850SFGL850HRG850850 nm Longpass
FGL1000aFGL1000S RG10001000 nm Longpass
  • These filters are also available in a mounted version.

Below are transmission plots (including surface reflections) as a function of wavelength for each of the colored glass filters presented on this page. Data was obtained for normal incidence. In each case, the shaded region indicates the range for which the transmission was >50% of the maximum transmission for that particular filter. To enlarge the plot, simply click on the plot. Thorlabs also offers bandpass colored filters.

Click on Graphs to Enlarge:

Transmission of FGL400
Transmission for FGL280
Transmission of FGL435
Transmission of FGL420
Transmission for FGL495
Transmission of FGL455
Transmission of FGL530
Transmission of FGL515
Transmission of FGL570
Transmission of FGL550
FGL610 Transmission Graph
Transmission of FGL590
Transmission of FGL645
Transmission of FGL630
Transmission of FGL695
Transmission of FGL665
Transmission of FGL9
Transmission of FGL715
Transmission of FGL830
FGL780 Transmission
Transmission of FGL1000
FGL850 Transmission
Damage Threshold Specifications
Item # PrefixDamage Threshold
FGL 30 W/cm2

Damage Threshold Data for Thorlabs' Longpass Colored Glass Filters

The specifications to the right are measured data for Thorlabs' longpass colored glass filters. Damage threshold specifications are constant for all longpass colored glass filters, regardless of the center wavelength or shape of the filter.

 

Laser Induced Damage Threshold Tutorial

This following is a general overview of how laser induced damage thresholds are measured and how the values may be utilized in determining the appropriateness of an optic for a given application. When choosing optics, it is important to understand the Laser Induced Damage Threshold (LIDT) of the optics being used. The LIDT for an optic greatly depends on the type of laser you are using. Continuous wave (CW) lasers typically cause damage from thermal effects (absorption either in the coating or in the substrate). Pulsed lasers, on the other hand, often strip electrons from the lattice structure of an optic before causing thermal damage. Note that the guideline presented here assumes room temperature operation and optics in new condition (i.e., within scratch-dig spec, surface free of contamination, etc.). Because dust or other particles on the surface of an optic can cause damage at lower thresholds, we recommend keeping surfaces clean and free of debris. For more information on cleaning optics, please see our Optics Cleaning tutorial.

Testing Method

Thorlabs' LIDT testing is done in compliance with ISO/DIS11254 specifications. A standard 1-on-1 testing regime is performed to test the damage threshold.

First, a low-power/energy beam is directed to the optic under test. The optic is exposed in 10 locations to this laser beam for a set duration of time (CW) or number of pulses (prf specified). After exposure, the optic is examined by a microscope (~100X magnification) for any visible damage. The number of locations that are damaged at a particular power/energy level is recorded. Next, the power/energy is either increased or decreased and the optic is exposed at 10 new locations. This process is repeated until damage is observed. The damage threshold is then assigned to be the highest power/energy that the optic can withstand without causing damage. A histogram such as that below represents the testing of one BB1-E02 mirror.

LIDT metallic mirror
The photograph above is a protected aluminum-coated mirror after LIDT testing. In this particular test, it handled 0.43 J/cm2 (1064 nm, 10 ns pulse, 10 Hz, Ø1.000 mm) before damage.
LIDT BB1-E02
Example Test Data
Fluence# of Tested LocationsLocations with DamageLocations Without Damage
1.50 J/cm210010
1.75 J/cm210010
2.00 J/cm210010
2.25 J/cm21019
3.00 J/cm21019
5.00 J/cm21091

According to the test, the damage threshold of the mirror was 2.00 J/cm2 (532 nm, 10 ns pulse, 10 Hz, Ø0.803 mm). Please keep in mind that it is only representative of one coating run and that Thorlabs' specified damage thresholds account for coating variances.

Continuous Wave and Long-Pulse Lasers

When an optic is damaged by a continuous wave (CW) laser, it is usually due to the melting of the surface as a result of absorbing the laser's energy or damage to the optical coating (antireflection) [1]. Pulsed lasers with pulse lengths longer than 1 µs can be treated as CW lasers for LIDT discussions. Additionally, when pulse lengths are between 1 ns and 1 µs, LIDT can occur either because of absorption or a dielectric breakdown (must check both CW and pulsed LIDT). Absorption is either due to an intrinsic property of the optic or due to surface irregularities; thus LIDT values are only valid for optics meeting or exceeding the surface quality specifications given by a manufacturer. While many optics can handle high power CW lasers, cemented (e.g., achromatic doublets) or highly absorptive (e.g., ND filters) optics tend to have lower CW damage thresholds. These lower thresholds are due to absorption or scattering in the cement or metal coating.

Linear Power Density Scaling

LIDT in linear power density vs. pulse length and spot size. For long pulses to CW, linear power density becomes a constant with spot size. This graph was obtained from [1].

Intensity Distribution

Pulsed lasers with high pulse repetition frequencies (PRF) may behave similarly to CW beams. Unfortunately, this is highly dependent on factors such as absorption and thermal diffusivity, so there is no reliable method for determining when a high PRF laser will damage an optic due to thermal effects. For beams with a large PRF both the average and peak powers must be compared to the equivalent CW power. Additionally, for highly transparent materials, there is little to no drop in the LIDT with increasing PRF.

In order to use the specified CW damage threshold of an optic, it is necessary to know the following:

  1. Wavelength of your laser
  2. Linear power density of your beam (total power divided by 1/e2 spot size)
  3. Beam diameter of your beam (1/e2)
  4. Approximate intensity profile of your beam (e.g., Gaussian)

The power density of your beam should be calculated in terms of W/cm. The graph to the right shows why the linear power density provides the best metric for long pulse and CW sources. Under these conditions, linear power density scales independently of spot size; one does not need to compute an adjusted LIDT to adjust for changes in spot size. This calculation assumes a uniform beam intensity profile. You must now consider hotspots in the beam or other nonuniform intensity profiles and roughly calculate a maximum power density. For reference, a Gaussian beam typically has a maximum power density that is twice that of the uniform beam (see lower right).

Now compare the maximum power density to that which is specified as the LIDT for the optic. If the optic was tested at a wavelength other than your operating wavelength, the damage threshold must be scaled appropriately. A good rule of thumb is that the damage threshold has a linear relationship with wavelength such that as you move to shorter wavelengths, the damage threshold decreases (i.e., a LIDT of 10 W/cm at 1310 nm scales to 5 W/cm at 655 nm). While this rule of thumb provides a general trend, it is not a quantitative analysis of LIDT vs wavelength. In CW applications, for instance, damage scales more strongly with absorption in the coating and substrate, which does not necessarily scale well with wavelength. While the above procedure provides a good rule of thumb for LIDT values, please contact Tech Support if your wavelength is different from the specified LIDT wavelength. If your power density is less than the adjusted LIDT of the optic, then the optic should work for your application.

Please note that we have a buffer built in between the specified damage thresholds online and the tests which we have done, which accommodates variation between batches. Upon request, we can provide individual test information and a testing certificate. The damage analysis will be carried out on a similar optic (customer's optic will not be damaged). Testing may result in additional costs or lead times. Contact Tech Support for more information.

Pulsed Lasers

As previously stated, pulsed lasers typically induce a different type of damage to the optic than CW lasers. Pulsed lasers often do not heat the optic enough to damage it; instead, pulsed lasers produce strong electric fields capable of inducing dielectric breakdown in the material. Unfortunately, it can be very difficult to compare the LIDT specification of an optic to your laser. There are multiple regimes in which a pulsed laser can damage an optic and this is based on the laser's pulse length. The highlighted columns in the table below outline the pulse lengths that our specified LIDT values are relevant for.

Pulses shorter than 10-9 s cannot be compared to our specified LIDT values with much reliability. In this ultra-short-pulse regime various mechanics, such as multiphoton-avalanche ionization, take over as the predominate damage mechanism [2]. In contrast, pulses between 10-7 s and 10-4 s may cause damage to an optic either because of dielectric breakdown or thermal effects. This means that both CW and pulsed damage thresholds must be compared to the laser beam to determine whether the optic is suitable for your application.

Pulse Durationt < 10-9 s10-9 < t < 10-7 s10-7 < t < 10-4 st > 10-4 s
Damage MechanismAvalanche IonizationDielectric BreakdownDielectric Breakdown or ThermalThermal
Relevant Damage SpecificationN/APulsedPulsed and CWCW

When comparing an LIDT specified for a pulsed laser to your laser, it is essential to know the following:

Energy Density Scaling

LIDT in energy density vs. pulse length and spot size. For short pulses, energy density becomes a constant with spot size. This graph was obtained from [1].

  1. Wavelength of your laser
  2. Energy density of your beam (total energy divided by 1/e2 area)
  3. Pulse length of your laser
  4. Pulse repetition frequency (prf) of your laser
  5. Beam diameter of your laser (1/e2 )
  6. Approximate intensity profile of your beam (e.g., Gaussian)

The energy density of your beam should be calculated in terms of J/cm2. The graph to the right shows why the energy density provides the best metric for short pulse sources. Under these conditions, energy density scales independently of spot size, one does not need to compute an adjusted LIDT to adjust for changes in spot size. This calculation assumes a uniform beam intensity profile. You must now adjust this energy density to account for hotspots or other nonuniform intensity profiles and roughly calculate a maximum energy density. For reference a Gaussian beam typically has a maximum power density that is twice that of the 1/e2 beam.

Now compare the maximum energy density to that which is specified as the LIDT for the optic. If the optic was tested at a wavelength other than your operating wavelength, the damage threshold must be scaled appropriately [3]. A good rule of thumb is that the damage threshold has an inverse square root relationship with wavelength such that as you move to shorter wavelengths, the damage threshold decreases (i.e., a LIDT of 1 J/cm2 at 1064 nm scales to 0.7 J/cm2 at 532 nm):

Pulse Wavelength Scaling

You now have a wavelength-adjusted energy density, which you will use in the following step.

Beam diameter is also important to know when comparing damage thresholds. While the LIDT, when expressed in units of J/cm2, scales independently of spot size; large beam sizes are more likely to illuminate a larger number of defects which can lead to greater variances in the LIDT [4]. For data presented here, a <1 mm beam size was used to measure the LIDT. For beams sizes greater than 5 mm, the LIDT (J/cm2) will not scale independently of beam diameter due to the larger size beam exposing more defects.

The pulse length must now be compensated for. The longer the pulse duration, the more energy the optic can handle. For pulse widths between 1 - 100 ns, an approximation is as follows:

Pulse Length Scaling

Use this formula to calculate the Adjusted LIDT for an optic based on your pulse length. If your maximum energy density is less than this adjusted LIDT maximum energy density, then the optic should be suitable for your application. Keep in mind that this calculation is only used for pulses between 10-9 s and 10-7 s. For pulses between 10-7 s and 10-4 s, the CW LIDT must also be checked before deeming the optic appropriate for your application.

Please note that we have a buffer built in between the specified damage thresholds online and the tests which we have done, which accommodates variation between batches. Upon request, we can provide individual test information and a testing certificate. Contact Tech Support for more information.


[1] R. M. Wood, Optics and Laser Tech. 29, 517 (1997).
[2] Roger M. Wood, Laser-Induced Damage of Optical Materials (Institute of Physics Publishing, Philadelphia, PA, 2003).
[3] C. W. Carr et al., Phys. Rev. Lett. 91, 127402 (2003).
[4] N. Bloembergen, Appl. Opt. 12, 661 (1973).

Click the Support Documentation icon document icon or Part Number below to view the available support documentation
Part Number Product Description
FGK01 Support Documentation FGK01 : Ø25 mm Round Colored Glass Filter Kit, Mounted in SM1 Lens Tubes
FGK01S Support Documentation FGK01S : Colored Glass Filter Kit, Unmounted, Set of 10
FGL1000 Support Documentation FGL1000 : Ø25 mm RG1000 Colored Glass Filter, 1000 nm Longpass
FGL1000S Support Documentation FGL1000S : 2" Square RG1000 Colored Glass Filter, 1000 nm Longpass
FGL280 Support Documentation FGL280 : Ø25 mm N-WG280 Colored Glass Filter, 280 nm Longpass
FGL280S Support Documentation FGL280S : 2" Square N-WG280 Colored Glass Filter, 280 nm Longpass
FGL400 Support Documentation FGL400 : Ø25 mm GG400 Colored Glass Filter, 400 nm Longpass
FGL400S Support Documentation FGL400S : 2" Square GG400 Colored Glass Filter, 400 nm Longpass
FGL420 Support Documentation FGL420 : Ø25 mm GG420 Colored Glass Filter, 420 nm Longpass
FGL435 Support Documentation FGL435 : Ø25 mm GG435 Colored Glass Filter, 435 nm Longpass
FGL435S Support Documentation FGL435S : 2" Square GG435 Colored Glass Filter, 435 nm Longpass
FGL455 Support Documentation FGL455 : Ø25 mm GG455 Colored Glass Filter, 460 nm Longpass
FGL495 Support Documentation FGL495 : Ø25 mm GG495 Colored Glass Filter, 495 nm Longpass
FGL495S Support Documentation FGL495S : 2" Square GG495 Colored Glass Filter, 495 nm Longpass
FGL515 Support Documentation FGL515 : Ø25 mm OG515 Colored Glass Filter, 515 nm Longpass
FGL515S Support Documentation FGL515S : 2" Square OG515 Colored Glass Filter, 515 nm Longpass
FGL530 Support Documentation FGL530 : Ø25 mm OG530 Colored Glass Filter, 530 nm Longpass
FGL550 Support Documentation FGL550 : Ø25 mm OG550 Colored Glass Filter, 550 nm Longpass
FGL550S Support Documentation FGL550S : 2" Square OG550 Colored Glass Filter, 550 nm Longpass
FGL570 Support Documentation FGL570 : Ø25 mm OG570 Colored Glass Filter, 570 nm Longpass
FGL590 Support Documentation FGL590 : Ø25 mm OG590 Colored Glass Filter, 590 nm Longpass
Part Number Product Description
FGL590S Support Documentation FGL590S : 2" Square OG590 Colored Glass Filter, 590 nm Longpass
FGL610 Support Documentation FGL610 : Ø25 mm RG610 Colored Glass Filter, 610 nm Longpass
FGL610H Support Documentation FGL610H : 6" Square RG610 Colored Glass Filter, 610 nm Longpass
FGL610S Support Documentation FGL610S : 2" Square RG610 Colored Glass Filter, 610 nm Longpass
FGL630 Support Documentation FGL630 : Ø25 mm RG630 Colored Glass Filter, 630 nm Longpass
FGL645 Support Documentation FGL645 : Ø25 mm RG645 Colored Glass Filter, 650 nm Longpass
FGL665 Support Documentation FGL665 : Ø25 mm RG665 Colored Glass Filter, 665 nm Longpass
FGL665S Support Documentation FGL665S : 2" Square RG665 Colored Glass Filter, 665 nm Longpass
FGL695 Support Documentation FGL695 : Ø25 mm RG695 Colored Glass Filter, 695 nm Longpass
FGL715 Support Documentation FGL715 : Ø25 mm RG715 Colored Glass Filter, 715 nm Longpass
FGL715S Support Documentation FGL715S : 2" Square RG715 Colored Glass Filter, 715 nm Longpass
FGL780 Support Documentation FGL780 : Ø25 mm RG780 Colored Glass Filter, 780 nm Longpass
FGL780H Support Documentation FGL780H : 6" Square RG780 Colored Glass Filter, 780 nm Longpass
FGL780S Support Documentation FGL780S : 2" Square RG780 Colored Glass Filter, 780 nm Longpass
FGL830 Support Documentation FGL830 : Ø25 mm RG830 Colored Glass Filter, 830 nm Longpass
FGL850 Support Documentation FGL850 : Ø25 mm RG850 Colored Glass Filter, 850 nm Longpass
FGL850H Support Documentation FGL850H : 6" Square RG850 Colored Glass Filter, 850 nm Longpass
FGL850S Support Documentation FGL850S : 2" Square RG850 Colored Glass Filter, 850 nm Longpass
FGL9 Support Documentation FGL9 : Ø25 mm RG9 Colored Glass Filter, 721 nm Longpass
KT01 Support Documentation KT01 : Storage Box for Mounted Ø1" (25 mm) Round Optics (Max. Capacity: 10)
KT03 Support Documentation KT03 : Storage Box for Unmounted 2" Square Optics (Max. Capacity: 10)

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Posted Comments:
Poster: jlow
Posted Date: 2013-01-21 16:15:00.0
Response from Jeremy at Thorlabs: The long pass and bandpass filters can be used with Xenon lamp. The specs might differ slightly since the angle of incidence is not 0°.
Poster: l.costantini
Posted Date: 2013-01-11 16:23:22.247
Hi, I'm Luca Costantini from Strategie s.r.l. and i should to know if the filter long pass and bandpass operates with xenon lamp
Poster: tholste
Posted Date: 2012-07-27 17:49:00.0
A response from Tor at Thorlabs to nateb: Thank you very much for contacting us. We also observe fluorescence at 532 nm for this filter - we will update this page with respect to these findings. In the meantime, I will be contacting you to discuss your application.
Poster: nateb
Posted Date: 2012-07-23 11:30:48.0
Using information from the Schott website and the information contained on the Thorlabs website I chose the FGL590 longpass filter. Unfortunately, I found that the filter fluoresced strongly under 532 nm light. Using a 15-50 mW 532 DPSS laser I illuminated the backside of the filter and found that there is a visible orange glow emitting from the filter. I would expect an OD5 blocking at this wavelength (532 nm). This fluorescence effect should be listed.
Poster: tcohen
Posted Date: 2012-07-17 13:49:00.0
Response from Tim at Thorlabs: Thank you for contacting us! I will email you the spectral data.
Poster: mzlin
Posted Date: 2012-07-16 19:36:05.0
How do these compare to your edgepass filters in slope steepness? I had a difficult time figuring this out with only the graphs showing divisions 100 or 200 nm apart. Would it be possible to email me the spectra of the 715 and 721 longpass colored filters please? Thank you!
Poster: tcohen
Posted Date: 2012-06-28 14:44:00.0
Response from Tim at Thorlabs: Thank you for your feedback! We have introduced the new FGL570 filters with 25mm OD because of the popularity of the size. We also have a larger version of the CFH1, the CFH2, for 1” diameter filters. If you are interested in ½” filters to retrofit into your system, we should be able to quote this as a custom for you and I have contacted you to discuss this option.
Poster: cbrideau
Posted Date: 2012-06-27 18:52:41.0
Any chance of getting these in 1/2" round instead of 1"? I'm using the little 1/2" filter holders (CFH1) and I'd like to use these colored glass filters with them.
Poster: technicalmarketing
Posted Date: 2008-02-14 17:25:57.0
We have double checked and the graphs shown in V19 are incorrect. Please refer to the web for the most up-to-date graphs
Poster: ghegenbart
Posted Date: 2007-11-20 04:38:25.0
The graph for the BG40 glass in the "Graph" tab is different from the graph shown on the pdf copy of the catalog page in the "Drawings&Documents" tab.
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Unmounted 280 nm Longpass Colored Glass Filters

FGL280 Transmission Curve
Click Here for Raw Data
Click to Enlarge
  • Fabricated from 2 mm Thick N-WG280 Schott Glass
  • Choose from 25 mm Round or 2" x 2" Square

Transmission (including surface reflections) is plotted as a function of wavelength to the right. The region shaded in blue represents the range over which this filter is transmissive. At wavelengths shorter than the cut-on wavelength, the filter blocks the light.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
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FGL280 Support Documentation
FGL280 Ø25 mm N-WG280 Colored Glass Filter, 280 nm Longpass
$34.64
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FGL280S Support Documentation
FGL280S 2" Square N-WG280 Colored Glass Filter, 280 nm Longpass
$70.08
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Unmounted 400 nm Longpass Colored Glass Filters

FGL400 Transmission Curve
Click Here for Raw Data
Click to Enlarge
  • Fabricated from 2 mm Thick GG400 Schott Glass
  • Choose from 25 mm Round or 2" x 2" Square

Transmission (including surface reflections) is plotted as a function of wavelength to the right. The region shaded in blue represents the range over which this filter is transmissive. At wavelengths shorter than the cut-on wavelength, the filter blocks the light.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
FGL400 Support Documentation
FGL400 Ø25 mm GG400 Colored Glass Filter, 400 nm Longpass
$34.64
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FGL400S Support Documentation
FGL400S 2" Square GG400 Colored Glass Filter, 400 nm Longpass
$70.08
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Unmounted 420 nm Longpass Colored Glass Filter

FGL420 Transmission Curve
Click Here for Raw Data
Click to Enlarge
  • Fabricated from 2 mm Thick GG420 Schott Glass
  • 25 mm Round Filter

Transmission (including surface reflections) is plotted as a function of wavelength to the right. The region shaded in blue represents the range over which this filter is transmissive. At wavelengths shorter than the cut-on wavelength, the filter blocks the light.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
FGL420 Support Documentation
FGL420 Customer Inspired! Ø25 mm GG420 Colored Glass Filter, 420 nm Longpass
$25.00
Today

Unmounted 435 nm Longpass Colored Glass Filters

FGL435 Transmission Curve
Click Here for Raw Data
Click to Enlarge
  • Fabricated from 2 mm Thick GG435 Schott Glass
  • Choose from 25 mm Round or 2" x 2" Square

Transmission (including surface reflections) is plotted as a function of wavelength to the right. The region shaded in blue represents the range over which this filter is transmissive. At wavelengths shorter than the cut-on wavelength, the filter blocks the light.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
FGL435 Support Documentation
FGL435 Ø25 mm GG435 Colored Glass Filter, 435 nm Longpass
$34.64
Today
FGL435S Support Documentation
FGL435S 2" Square GG435 Colored Glass Filter, 435 nm Longpass
$70.08
Today

Unmounted 460 nm Longpass Colored Glass Filter

FGL455 Transmission Curve
Click Here for Raw Data
Click to Enlarge
  • Fabricated from 2 mm Thick GG455 Schott Glass
  • 25 mm Round Filter

Transmission (including surface reflections) is plotted as a function of wavelength to the right. The region shaded in blue represents the range over which this filter is transmissive. At wavelengths shorter than the cut-on wavelength, the filter blocks the light.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
FGL455 Support Documentation
FGL455 Customer Inspired! Ø25 mm GG455 Colored Glass Filter, 460 nm Longpass
$25.00
Today

Unmounted 495 nm Longpass Colored Glass Filters

FGL495 Transmission Curve
Click Here for Raw Data
Click to Enlarge
  • Fabricated from 2 mm Thick GG495 Schott Glass
  • Choose from 25 mm Round or 2" x 2" Square

Transmission (including surface reflections) is plotted as a function of wavelength to the right. The region shaded in blue represents the range over which this filter is transmissive. At wavelengths shorter than the cut-on wavelength, the filter blocks the light.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
FGL495 Support Documentation
FGL495 Ø25 mm GG495 Colored Glass Filter, 495 nm Longpass
$34.64
Today
FGL495S Support Documentation
FGL495S 2" Square GG495 Colored Glass Filter, 495 nm Longpass
$70.08
Today

Unmounted 515 nm Longpass Colored Glass Filters

FGL515 Transmission Curve
Click Here for Raw Data
Click to Enlarge
  • Fabricated from 2 mm Thick OG515 Schott Glass
  • Choose from 25 mm Round or 2" x 2" Square

Transmission (including surface reflections) is plotted as a function of wavelength to the right. The region shaded in blue represents the range over which this filter is transmissive. At wavelengths shorter than the cut-on wavelength, the filter blocks the light.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
FGL515 Support Documentation
FGL515 Ø25 mm OG515 Colored Glass Filter, 515 nm Longpass
$34.64
Today
FGL515S Support Documentation
FGL515S 2" Square OG515 Colored Glass Filter, 515 nm Longpass
$70.08
Today

Unmounted 530 nm Longpass Colored Glass Filter

FGL530 Transmission Curve
Click Here for Raw Data
Click to Enlarge
  • Fabricated from 2 mm Thick OG530 Schott Glass
  • 25 mm Round Filter

Transmission (including surface reflections) is plotted as a function of wavelength to the right. The region shaded in blue represents the range over which this filter is transmissive. At wavelengths shorter than the cut-on wavelength, the filter blocks the light.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
FGL530 Support Documentation
FGL530 Customer Inspired! Ø25 mm OG530 Colored Glass Filter, 530 nm Longpass
$25.00
Today

Unmounted 550 nm Longpass Colored Glass Filters

FGL550 Transmission Curve
Click Here for Raw Data
Click to Enlarge
  • Fabricated from 2 mm Thick OG550 Schott Glass
  • Choose from 25 mm Round or 2" x 2" Square

Transmission (including surface reflections) is plotted as a function of wavelength to the right. The region shaded in blue represents the range over which this filter is transmissive. At wavelengths shorter than the cut-on wavelength, the filter blocks the light.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
FGL550 Support Documentation
FGL550 Ø25 mm OG550 Colored Glass Filter, 550 nm Longpass
$34.64
Today
FGL550S Support Documentation
FGL550S 2" Square OG550 Colored Glass Filter, 550 nm Longpass
$70.08
Today

Unmounted 570 nm Longpass Colored Glass Filter

FGL570 Transmission Curve
Click Here for Raw Data
Click to Enlarge
  • Fabricated from 2 mm Thick OG570 Schott Glass
  • 25 mm Round Filter

Transmission (including surface reflections) is plotted as a function of wavelength to the right. The region shaded in blue represents the range over which this filter is transmissive. At wavelengths shorter than the cut-on wavelength, the filter blocks the light.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
FGL570 Support Documentation
FGL570 Customer Inspired! Ø25 mm OG570 Colored Glass Filter, 570 nm Longpass
$25.00
Today

Unmounted 590 nm Longpass Colored Glass Filters

FGL590 Transmission Curve
Click Here for Raw Data
Click to Enlarge
  • Fabricated from 2 mm Thick OG590 Schott Glass
  • Choose from 25 mm Round or 2" x 2" Square

Transmission (including surface reflections) is plotted as a function of wavelength to the right. The region shaded in blue represents the range over which this filter is transmissive. At wavelengths shorter than the cut-on wavelength, the filter blocks the light.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
FGL590 Support Documentation
FGL590 Ø25 mm OG590 Colored Glass Filter, 590 nm Longpass
$34.64
Today
FGL590S Support Documentation
FGL590S 2" Square OG590 Colored Glass Filter, 590 nm Longpass
$70.08
Today

Unmounted 610 nm Longpass Colored Glass Filters

FGL610 Transmission Curve
Click Here for Raw Data
Click to Enlarge
  • Fabricated from 2 mm Thick (3 mm for the 6" Version) RG610 Schott Glass
  • Choose from 25 mm Round, 2" x 2" Square, or 6" x 6" Square

Transmission (including surface reflections) is plotted as a function of wavelength to the right. The region shaded in blue represents the range over which this filter is transmissive. At wavelengths shorter than the cut-on wavelength, the filter blocks the light.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
FGL610 Support Documentation
FGL610 Ø25 mm RG610 Colored Glass Filter, 610 nm Longpass
$34.64
Today
FGL610S Support Documentation
FGL610S 2" Square RG610 Colored Glass Filter, 610 nm Longpass
$70.08
Today
FGL610H Support Documentation
FGL610H 6" Square RG610 Colored Glass Filter, 610 nm Longpass
$320.00
Today

Unmounted 630 nm Longpass Colored Glass Filter

FGL630 Transmission Curve
Click Here for Raw Data
Click to Enlarge
  • Fabricated from 2 mm Thick RG630 Schott Glass
  • 25 mm Round Filter

Transmission (including surface reflections) is plotted as a function of wavelength to the right. The region shaded in blue represents the range over which this filter is transmissive. At wavelengths shorter than the cut-on wavelength, the filter blocks the light.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
FGL630 Support Documentation
FGL630 Customer Inspired! Ø25 mm RG630 Colored Glass Filter, 630 nm Longpass
$25.00
Today

Unmounted 650 nm Longpass Colored Glass Filter

FGL645 Transmission Curve
Click Here for Raw Data
Click to Enlarge
  • Fabricated from 2 mm Thick RG645 Schott Glass
  • 25 mm Round Filter

Transmission (including surface reflections) is plotted as a function of wavelength to the right. The region shaded in blue represents the range over which this filter is transmissive. At wavelengths shorter than the cut-on wavelength, the filter blocks the light.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
FGL645 Support Documentation
FGL645 Customer Inspired! Ø25 mm RG645 Colored Glass Filter, 650 nm Longpass
$25.00
Today

Unmounted 665 nm Longpass Colored Glass Filters

FGL665 Transmission Curve
Click Here for Raw Data
Click to Enlarge
  • Fabricated from 2 mm Thick RG665 Schott Glass
  • Choose from 25 mm Round or 2" x 2" Square

Transmission (including surface reflections) is plotted as a function of wavelength to the right. The region shaded in blue represents the range over which this filter is transmissive. At wavelengths shorter than the cut-on wavelength, the filter blocks the light.

Please click here for an Excel spreadsheet containing the raw transmission data.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
FGL665 Support Documentation
FGL665 Ø25 mm RG665 Colored Glass Filter, 665 nm Longpass
$34.64
Today
FGL665S Support Documentation
FGL665S 2" Square RG665 Colored Glass Filter, 665 nm Longpass
$70.08
Today

Unmounted 700 nm Longpass Colored Glass Filter

FGL695 Transmission Curve
Click Here for Raw Data
Click to Enlarge
  • Fabricated from 2 mm Thick RG695 Schott Glass
  • 25 mm Round Filter

Transmission (including surface reflections) is plotted as a function of wavelength to the right. The region shaded in blue represents the range over which this filter is transmissive. At wavelengths shorter than the cut-on wavelength, the filter blocks the light.

Please click here for an Excel spreadsheet containing the raw transmission data.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
FGL695 Support Documentation
FGL695 Customer Inspired! Ø25 mm RG695 Colored Glass Filter, 695 nm Longpass
$25.00
Today

Unmounted 715 nm Longpass Colored Glass Filters

FGL715 Transmission Curve
Click Here for Raw Data
Click to Enlarge
  • Fabricated from 2 mm Thick RG715 Schott Glass
  • Choose from 25 mm Round or 2" x 2" Square

Transmission (including surface reflections) is plotted as a function of wavelength to the right. The region shaded in blue represents the range over which this filter is transmissive. At wavelengths shorter than the cut-on wavelength, the filter blocks the light.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
FGL715 Support Documentation
FGL715 Ø25 mm RG715 Colored Glass Filter, 715 nm Longpass
$39.52
Today
FGL715S Support Documentation
FGL715S 2" Square RG715 Colored Glass Filter, 715 nm Longpass
$70.08
Today

Unmounted 721 nm Longpass Colored Glass Filter

FGL9 Transmission Curve
Click Here for Raw Data
Click to Enlarge
  • Fabricated from 2 mm Thick RG9 Schott Glass
  • 25 mm Round Filter

Transmission (including surface reflections) is plotted as a function of wavelength to the right. The region shaded in blue represents the range over which this filter is transmissive. At wavelengths shorter than the cut-on wavelength, the filter blocks the light.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
FGL9 Support Documentation
FGL9 Customer Inspired! Ø25 mm RG9 Colored Glass Filter, 721 nm Longpass
$25.00
Today

Unmounted 780 nm Longpass Colored Glass Filters

FGL780 Transmission Curve
Click Here for Raw Data
Click to Enlarge
  • Fabricated from 2 mm Thick (3 mm for the 6" Version) RG780 Schott Glass
  • Choose from 25 mm Round, 2" x 2" Square, or 6" x 6" Square

Transmission (including surface reflections) is plotted as a function of wavelength to the right. The region shaded in blue represents the range over which this filter is transmissive. At wavelengths shorter than the cut-on wavelength, the filter blocks the light.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
FGL780 Support Documentation
FGL780 Ø25 mm RG780 Colored Glass Filter, 780 nm Longpass
$39.52
Today
FGL780S Support Documentation
FGL780S 2" Square RG780 Colored Glass Filter, 780 nm Longpass
$70.08
Today
FGL780H Support Documentation
FGL780H 6" Square RG780 Colored Glass Filter, 780 nm Longpass
$495.00
Today

Unmounted 830 nm Longpass Colored Glass Filter

FGL830 Transmission Curve
Click Here for Raw Data
Click to Enlarge
  • Fabricated from 2 mm Thick RG830 Schott Glass
  • 25 mm Round Filter

Transmission (including surface reflections) is plotted as a function of wavelength to the right. The region shaded in blue represents the range over which this filter is transmissive. At wavelengths shorter than the cut-on wavelength, the filter blocks the light.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
FGL830 Support Documentation
FGL830 Customer Inspired! Ø25 mm RG830 Colored Glass Filter, 830 nm Longpass
$25.00
Today

Unmounted 850 nm Longpass Colored Glass Filters

FGL850 Transmission Curve
Click Here for Raw Data
Click to Enlarge
  • Fabricated from 2 mm Thick (3 mm for the 6" Version) RG850 Schott Glass
  • Choose from 25 mm Round, 2" x 2" Square, or 6" x 6" Square

Transmission (including surface reflections) is plotted as a function of wavelength to the right. The region shaded in blue represents the range over which this filter is transmissive. At wavelengths shorter than the cut-on wavelength, the filter blocks the light.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
FGL850 Support Documentation
FGL850 Ø25 mm RG850 Colored Glass Filter, 850 nm Longpass
$49.44
Today
FGL850S Support Documentation
FGL850S 2" Square RG850 Colored Glass Filter, 850 nm Longpass
$72.48
Today
FGL850H Support Documentation
FGL850H 6" Square RG850 Colored Glass Filter, 850 nm Longpass
$495.00
Today

Unmounted 1000 nm Longpass Colored Glass Filters

FGL1000 Transmission Curve
Click Here for Raw Data
Click to Enlarge
  • Fabricated from 2 mm Thick RG1000 Schott Glass
  • Choose from 25 mm Round or 2" x 2" Square

Transmission (including surface reflections) is plotted as a function of wavelength to the right. The region shaded in blue represents the range over which this filter is transmissive. At wavelengths shorter than the cut-on wavelength, the filter blocks the light.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
FGL1000 Support Documentation
FGL1000 Ø25 mm RG1000 Colored Glass Filter, 1000 nm Longpass
$34.64
Today
FGL1000S Support Documentation
FGL1000S 2" Square RG1000 Colored Glass Filter, 1000 nm Longpass
$70.08
Today

Colored Filter Kits

Thorlabs offers two filter kits that bundle our most popular longpass and bandpass colored glass filters. The FGK01 Colored Glass Filter Kit contains three filters from our bandpass family and seven from our longpass family. The Ø25 mm filters are premounted in an SM1L03 lens tube that is engraved with the part number and bandpass region (for bandpass filters) or cut-on wavelength (for longpass filters), and ship in a KT01 Storage Box with labeled slots to aid organization. The FGK01S Colored Glass Filter Kit contains the unmounted, square 2" x 2" counterparts to the filters in the FGK01.

FGK01 ContentsFGK01S ContentsBandpass RegionTransmission Plot
FGS900M FGS900S 315 - 710 nm Plot
FGB37M FGB37S 335 - 610 nm Plot
FGUVM FGUVS 325 - 385 nm Plot
FGL400M FGL400S 400 - 1800 nm Plot
FGL495M FGL495S 495 - 1800 nm Plot
FGL550M FGL550S 550 - 1800 nm Plot
FGL610M FGL610S 610 - 1800 nm Plot
FGL715M FGL715S 715 - 1800 nm Plot
FGL780M FGL780S 780 - 1800 nm Plot
FGL850M FGL850S 850 - 1800 nm Plot
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
FGK01 Support Documentation
FGK01 Ø25 mm Round Colored Glass Filter Kit, Mounted in SM1 Lens Tubes
$423.70
Today
FGK01S Support Documentation
FGK01S Colored Glass Filter Kit, Unmounted, Set of 10
$630.72
Today

Filter Storage Boxes

If you purchase individual filters and would like a safe, convenient place to store them when not in use, consider our KT01 and KT03 Storage Boxes. These are the same storage boxes that our prepackaged filter kits ship with. The KT01 is designed to hold up to ten mounted Ø25 mm filters, while the KT03 can hold up to ten unmounted 2" x 2" filters.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
KT01 Support Documentation
KT01 Storage Box for Mounted Ø1" (25 mm) Round Optics (Max. Capacity: 10)
$86.70
Today
KT03 Support Documentation
KT03 Storage Box for Unmounted 2" Square Optics (Max. Capacity: 10)
$81.60
Today
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