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Broadband Polarizing Beamsplitter Cubes in 16 mm Cage Cubes


  • Transmitted Beam Extinction Ratio: >1000:1
  • Reflects S Polarization by 90°
  • SM05 Lens Tube and 16 mm Cage
    System Compatible
  • AR Coated on All Four Optical Faces

CCM5-PBS201

420 - 680 nm

CCM5-PBS203

900 - 1300 nm

Application Idea

CCM5-PBS203 Beamsplitter Cube
Connected in a 16 mm Cage System
with a CM05-E03 Turning Mirror
Cube via Four SRSCA Adapters

Related Items


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Mounted Beamsplitter Cube
Cube Beamsplitter Diagram 
(Coating and Cement Layer Not to Scale)

Features

  • 16 mm Cage System and SM05 Lens Tube Compatible Mounts
  • Wavelength Ranges Available
    • 420 - 680 nm
    • 620 - 1000 nm
    • 900 - 1300 nm
    • 1200 - 1600 nm
  • Extinction Ratio
    • TP:TS > 1000:1
    • RS:RP ~ 100:1

These 16 mm Cage-Compatible Polarizing Beamsplitter Cubes have a dielectric coating along the diagonal interface between the two right angle prisms that make up the cube. This coating reflects s-polarized light, while transmitting p-polarized light. For polarization-insensitive applications, we also offer Non-Polarizing Beamsplitter Cubes, as well as Cube-Mounted Turning Prism Mirrors.

For highest polarization purity, use the transmitted beam, which offers a 1000:1 (Tp:Ts) extinction ratio. The reflected beam will only have an extinction ratio of roughly 20:1 to 100:1, depending on the beamsplitter. All of the faces of this cube have broadband antireflective coatings that minimize losses due to reflections. The dielectric beamsplitting coating is applied to the hypotenuse of one of the two prisms that make up the cube. Then, cement is used to bind the two prism halves together (refer to the diagram to the right). In order to achieve the desired 50:50 split ratio, the light can enter through any of the faces. One possible orientation is engraved on the top of the cage cube.

A bottom-located 8-32 or M4 tap is included for post mounting. The housings feature four SM05-threaded entrance and exit ports for compatibility with our SM05 (0.535"-40) lens tubes. Four 4-40 tapped holes surrounding each port provide compatibility with our 16 mm cage systems. The Mounted Beamsplitters can be connected to other cage cubes through the use of our cage rods and SRSCA adapters.

For an overview of our complete selection of beamsplitting optics, please see the BS Selection Guide tab. For applications requiring a higher damage threshold, we also offer 1" unmounted High-Power Polarizing Beamsplitting Cubes. These may be mounted in our 30 mm Cage Cubes and incorporated into 16 mm cage systems using our Cage Size Adapters.

Please note that each beamsplitter cube is epoxied within the cage cube mount and cannot be removed.

Item # CCM5-PBS201(/M) CCM5-PBS202(/M) CCM5-PBS203(/M) CCM5-PBS204(/M)
AR Coating Range 420 - 680 nm 620 - 1000 nm 900 - 1300 nm 1200 - 1600 nm
AR Coating
(All Four Surfaces)
Ravg < 0.5% at 0° AOI
from 420 - 680 nm
Ravg < 0.5% at 0° AOI
from 620 - 1000 nm
Ravg < 0.5% at 0° AOI
from 900 - 1300 nm
Ravg < 0.5% at 0° AOI
from 1200 - 1600 nm
Ports 4 Ports, Each with SM05 (0.535"-40) Threading and Four 4-40 Taps for Cage Rods
Beamsplitter
Material
N-SF1
Extinction
Ratioa
Tp:Ts >1000:1
Transmission
Efficiencyb
Tp > 90%
Reflection Efficiencyb Rs > 99.5%
Transmitted
Beam Deviationc
<5 arcmin
Reflected
Beam Deviationd
90° ± 20 arcmin
Clear Aperture Ø12.5 mm
Surface Flatness <λ/4 @ 633 nm
Wavefront Distortione <λ/4 @ 633 nm
Surface Quality 40-20 Scratch-Dig
  • The extinction ratio (ER) is the ratio of maximum to minimum transmission of a sufficiently linearly polarized input. When the transmission axis and input polarization are parallel, the transmission is at its maximum; rotate the polarizer by 90° for minimum transmission.
  • Transmission and reflection data is based on that of the beamsplitter coating and does not account for the BBAR surface coating.
  • Defined with respect to the beamsplitter cube, not the mechanical housing.
  • Defined with respect to the mechanical housing.
  • Wavefront distortion is for both transmitted and reflected beams.
Coating Range Damage Threshold
420 - 680 nm CWa 50 W/cm at 532 nm, Ø0.015 mm
Pulse 2 J/cm2 at 532 nm, 10 ns, 10 Hz
620 - 1000 nm CWa 50 W/cm at 810 nm, Ø0.019 mm
Pulse 2 J/cm2 at 810 nm, 10 ns, 10 Hz
900 - 1300 nm CWa,b 2000 W/cm at 1064 nm, Ø0.018 mm
Pulse 2 J/cm2 at 1064 nm, 10 ns, 10 Hz
1200 - 1600 nm CWa,b 2000 W/cm at 1542 nm, Ø0.033 mm
Pulse 5 J/cm2 at 1542 nm, 10 ns, 10 Hz
  • The power density of your beam should be calculated in terms of W/cm. For an explanation of why the linear power density provides the best metric for long pulse and CW sources, please see the Damage Thresholds tab.
  • The stated damage threshold is a certification measurement, as opposed to a true damage threshold (i.e., the optic was able to withstand the maximum output of the laser with no damage).

The shaded regions in the graphs below denote the transmission bands of the beamsplitters for which the performance is guaranteed to meet the stated specifications. Performance outside the shaded regions will vary from lot to lot and is not guaranteed.

CM05-PBS201 Transmittance
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Click Here for Raw Data
CM05-PBS202 Transmittance
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CM05-PBS203 Transmittance
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CM05-PBS204 Transmittance
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Thorlabs' portfolio contains many different kinds of beamsplitters, which can split beams by intensity or by polarization. We offer plate and cube beamsplitters, though other form factors exist, including pellicle and birefringent crystal. Many of our beamsplitters come in premounted or unmounted variants. Below is a complete listing of our beamsplitter offerings. To explore the available types, wavelength ranges, splitting/extinction ratios, transmission, and available sizes for each beamsplitter category, click More [+] in the appropriate row below.

Non-Polarizing Beamsplitters

Plate Beamsplitters
Cube Beamsplitters
Pellicle Beamsplitters
  • 45° AOI Unless Otherwise Noted

Polarizing Beamsplitters

Plate Beamsplitters
Cube Beamsplitters
Birefringent Crystal Beamsplitters
  • Mounted in a protective box, unthreaded ring, or cylinder.
  • Available unmounted or mounted in a protective box or unthreaded cylinder.

Other Beamsplitters

Other Beamsplitters
Coating RangeDamage Threshold
420 - 680 nm CWa 50 W/cm at 532 nm, Ø0.015 mm
Pulse 2 J/cm2 at 532 nm, 10 ns, 10 Hz
620 - 1000 nm CWa 50 W/cm at 810 nm, Ø0.019 mm
Pulse 2 J/cm2 at 810 nm, 10 ns, 10 Hz
900 - 1300 nm CWa,b 2000 W/cm at 1064 nm, Ø0.018 mm
Pulse 2 J/cm2 at 1064 nm, 10 ns, 10 Hz
1200 - 1600 nm CWa,b 2000 W/cm at 1542 nm, Ø0.033 mm
Pulse 5 J/cm2 at 1542 nm, 10 ns, 10 Hz
  • The power density of your beam should be calculated in terms of W/cm. For an explanation of why the linear power density provides the best metric for long pulse and CW sources, please see below.
  • The stated damage threshold is a certification measurement, as opposed to a true damage threshold (i.e., the optic was able to withstand the maximum output of the laser with no damage).

Damage Threshold Data for Thorlabs' Polarizing Beamsplitters

The specifications to the right are measured data for Thorlabs' polarizing beamsplitters.

 

Laser Induced Damage Threshold Tutorial

The 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/DIS 11254 and ISO 21254 specifications.

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 30 seconds (CW) or for a number of pulses (pulse repetition frequency 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 Locations Locations with Damage Locations Without Damage
1.50 J/cm2 10 0 10
1.75 J/cm2 10 0 10
2.00 J/cm2 10 0 10
2.25 J/cm2 10 1 9
3.00 J/cm2 10 1 9
5.00 J/cm2 10 9 1

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 these tests are performed on clean optics, as dirt and contamination can significantly lower the damage threshold of a component. While the test results are only representative of one coating run, Thorlabs specifies damage threshold values that 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.

When pulse lengths are between 1 ns and 1 µs, laser-induced damage can occur either because of absorption or a dielectric breakdown (therefore, a user 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 high 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. Beam diameter of your beam (1/e2)
  3. Approximate intensity profile of your beam (e.g., Gaussian)
  4. Linear power density of your beam (total power divided by 1/e2 beam diameter)

Thorlabs expresses LIDT for CW lasers as a linear power density measured in W/cm. In this regime, the LIDT given as a linear power density can be applied to any beam diameter; one does not need to compute an adjusted LIDT to adjust for changes in spot size, as demonstrated by the graph to the right. Average linear power density can be calculated using the equation below. 

The calculation above assumes a uniform beam intensity profile. You must now consider hotspots in the beam or other non-uniform 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):

CW Wavelength Scaling

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 relevant pulse lengths for our specified LIDT values.

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 Duration t < 10-9 s 10-9 < t < 10-7 s 10-7 < t < 10-4 s t > 10-4 s
Damage Mechanism Avalanche Ionization Dielectric Breakdown Dielectric Breakdown or Thermal Thermal
Relevant Damage Specification No Comparison (See Above) Pulsed Pulsed and CW CW

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 expressing the LIDT as an energy density provides the best metric for short pulse sources. In this regime, the LIDT given as an energy density can be applied to any beam diameter; 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 energy 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 (1998).
[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).


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Polarizer Selection Guide

Thorlabs offers a diverse range of polarizers, including wire grid, film, calcite, alpha-BBO, rutile, and beamsplitting polarizers. Collectively, our line of wire grid polarizers offers coverage from the visible range to the beginning of the Far-IR range. Our nanoparticle linear film polarizers provide extinction ratios as high as 100 000:1. Alternatively, our other film polarizers offer an affordable solution for polarizing light from the visible to the Near-IR. Next, our beamsplitting polarizers allow for use of the reflected beam, as well as the more completely polarized transmitted beam. Finally, our alpha-BBO (UV), calcite (visible to Near-IR), rutile (Near-IR to Mid-IR), and yttrium orthovanadate (YVO4) (Near-IR to Mid-IR) polarizers each offer an exceptional extinction ratio of 100 000:1 within their respective wavelength ranges.

To explore the available types, wavelength ranges, extinction ratios, transmission, and available sizes for each polarizer category, click More [+] in the appropriate row below.

Wire Grid Polarizers
Film Polarizers
Beamsplitting Polarizers
alpha-BBO Polarizers
Calcite Polarizers
Quartz Polarizers
Magnesium Fluoride Polarizers
Yttrium Orthovanadate (YVO4) Polarizers
Rutile Polarizers
  • Click on the graph icons in this column to view a transmission curve for the corresponding polarizer. Each curve represents one substrate sample or coating run and is not guaranteed.
  • Mounted in a protective box, unthreaded ring, or cylinder.
  • Available unmounted or in an SM05-threaded (0.535"-40) mount that indicates the polarization axis.
  • Available unmounted or in an SM1-threaded (1.035"-40) mount that indicates the polarization axis.
  • Available unmounted or mounted in cubes for cage system compatibility.
  • Calcite's transmittance of light near 350 nm is typically around 75% (see Transmission column).
  • Available unmounted or in an unthreaded Ø1/2" housing.
  • The transmission curves for calcite are valid for linearly polarized light with a polarization axis aligned with the mark on the polarizer's housing.
  • The 1064 nm V coating corresponds to a -C26 suffix in the item number.
  • Available unmounted or mounted in a protective box or unthreaded cylinder that indicates the polarization axis.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
CCM5-PBS201 Support Documentation
CCM5-PBS201Customer Inspired! 16 mm Cage-Cube-Mounted Polarizing Beamsplitter Cube, 420-680 nm, 8-32 Tap
$282.44
Today
CCM5-PBS202 Support Documentation
CCM5-PBS202Customer Inspired! 16 mm Cage-Cube-Mounted Polarizing Beamsplitter Cube, 620-1000 nm, 8-32 Tap
$282.44
Today
CCM5-PBS203 Support Documentation
CCM5-PBS203Customer Inspired! 16 mm Cage-Cube-Mounted Polarizing Beamsplitter Cube, 900-1300 nm, 8-32 Tap
$282.44
Today
CCM5-PBS204 Support Documentation
CCM5-PBS204Customer Inspired! 16 mm Cage-Cube-Mounted Polarizing Beamsplitter Cube, 1200-1600 nm, 8-32 Tap
$282.44
Today
+1 Qty Docs Part Number - Metric Price Available
CCM5-PBS201/M Support Documentation
CCM5-PBS201/MCustomer Inspired! 16 mm Cage-Cube-Mounted Polarizing Beamsplitter Cube, 420-680 nm, M4 Tap
$282.44
Today
CCM5-PBS202/M Support Documentation
CCM5-PBS202/MCustomer Inspired! 16 mm Cage-Cube-Mounted Polarizing Beamsplitter Cube, 620-1000 nm, M4 Tap
$282.44
Today
CCM5-PBS203/M Support Documentation
CCM5-PBS203/MCustomer Inspired! 16 mm Cage-Cube-Mounted Polarizing Beamsplitter Cube, 900-1300 nm, M4 Tap
$282.44
Today
CCM5-PBS204/M Support Documentation
CCM5-PBS204/MCustomer Inspired! 16 mm Cage-Cube-Mounted Polarizing Beamsplitter Cube, 1200-1600 nm, M4 Tap
$282.44
Today
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