Bandpass Filter Selection
Ø25 mm	2" x 2"	6" x 6"	Bandpass Region
FGUV5*	FGUV5S		240 - 395 nm
FGUV11*	FGUV11S		275 - 375 nm
FGS550			304 - 785 nm
FGB25*	FGB25S		315 - 445 nm 715 - 1095 nm
FGS900*	FGS900S	FGS900H	315 - 710 nm
FGS580			315 - 725 nm
FGUV*	FGUVS		325 - 385 nm
FGS600			330 - 665 nm
FGB37*	FGB37S	FGB37H	335 - 610 nm
FGB39			360 - 580 nm
FGB18			412 - 569 nm
FGB7			435 - 500 nm
FGB67*	FGB67S		900 - 1375 nm

* These filters are also available in a mounted version.

Features

Bandpass Regions Between 240 and 1375 nm
Ø25 mm Rounds, 2" x 2" Squares, or 6" x 6" Squares Available
Kits Include Selection of Bandpass and Longpass Filters

These bandpass 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 bandpass filters offered here, Thorlabs offers a series of longpass colored glass filters. In either case, the filters are available in both round and square varieties. The Ø25 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. If transmission ratios greater than those provided by the filters listed here are required, we now provide a selection of bandpass colored glass filters with antireflective coatings.

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 bandpass 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
Bandpass			Longpass
Mounted	Unmounted	AR Coated	Mounted	Unmounted

General Specifications
Material	Schott Colored Glass
Size	Ø25 mm	2" x 2"	6" x 6"
Thickness	2 mm		3 mm
Surface Quality	40-20 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 (Typ.)
Clear Aperture	80% of Diameter	80%

Item # (Ø25 mm)	Item # (2" x 2")	Item # (6" x 6")	Schott Glass	Description^a
FGUV5	FGUV5S		UG 5	Bandpass Filter: 240 - 395 nm
FGUV11	FGUV11S		UG 11	Bandpass Filter: 275 - 375 nm
FGS550			KG2	Bandpass Filter: 304 - 785 nm
FGS900	FGS900S	FGS900H	KG 3	Bandpass Filter: 315 - 710 nm
FGB25	FGB25S		BG 3	Double Bandpass Filter: 315 - 445 nm, 715 - 1095 nm
FGS580			KG1	Bandpass Filter: 315 - 725 nm
FGUV	FGUVS		UG 1	Bandpass Filter: 325 - 385 nm
FGS600			KG5	Bandpass Filter: 330 - 665 nm
FGB37	FGB37S	FGB37H	BG 40	Bandpass Filter: 335 - 610 nm
FGB39			BG39	Bandpass Filter: 360 - 580 nm
FGB18			BG18	Bandpass Filter: 412 - 569 nm
FGB7			BG7	Bandpass Filter: 435 - 500 nm
FGV9			VG9	Bandpass Filter: 485 - 565 nm
FGB67	FGB67S		BG 36	Bandpass Filter: 900 - 1375 nm

Spectral region given represents the range for which the transmission is >50% of the maximum transmission.

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Posted Comments:

Poster: bdada

Posted Date: 2011-11-15 18:29:00.0

Response from Buki at Thorlabs: Thank you so much for participating in our Feedback Forum. You've provided us with some great product ideas that we intend to pursue. We can offer custom filters to meet your specifications and we will contact you directly to continue this discussion.

Poster: clarafly

Posted Date: 2011-11-10 17:35:53.0

Do you offer the filter with BG39 color glass? The extinction of BG39 at long wavelength is much better than BG40. Some of the color glasses, such as BG39 and BG40, are quite sensitive to humidity. Can you offer color glass filters with AR coatings on both sides? The coatings can protect the color glasses from humidity and reduce the reflection loss at both surfaces at the same time.

Poster: Javier

Posted Date: 2010-06-23 09:54:07.0

Response from Javier at Thorlabs to orevilla: The tolerance value of +0.0/-0.4 mm also applies to the thickness of the filter.

Poster: orevilla

Posted Date: 2010-06-23 06:50:27.0

In the specs sheet of the FGS900S bandpass filter the thikness is 2mm with a tolerance of +0.0/-0.4mm. Is this correct? It is the same as the dimensional tolerance, but for the thikness is a 20% of variation (it seems to be very high). Thank you in advance for your time.

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