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Polarizing Plate Beamsplitters


  • Hard Coated for Higher Damage Threshold
  • Nine Design Wavelengths for Laser Sources
  • Reflects S-Polarization 90º

PBSW-780

PBSW-532

PBSW-1550

Application Idea

PBSW-633 Plate Beamsplitter
in an FMP1 Fixed Optic Mount

PBSW-1030R

Related Items


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Polarizing Plate Beamsplitters
Specification Round Rectangular
Available Design Wavelengths 405 nm
532 nm
633 nm
780 nm
808 nm
1030 nm
1064 nm
1310 nm
1550 nm
Extinction Ratioa,b >10 000:1
Transmission Efficiencyb Tp > 95%
Size Ø1" (25.4 mm) 25.0 mm x 36.0 mm
Size Tolerance +0.0 / -0.2 mm ±0.1 mm
Clear Aperture ≥85% of Diameterc ≥22.5 x 32.4 mm
Thickness 5.0 mm 1.0 mm
Wedge 30 ± 10 arcmin None
Surface Quality 20-10 Scratch-Dig
Transmitted Wavefront Error λ/4 at 632.8 nm
Substrate UV Fused Silicad
Reference Drawing
  • The extinction ratio (ER) is the ratio of maximum to minimum transmission of a 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.
  • Measured at 45° AOI
  • Click the Docs () icon below for the dimensions of each optics' clear aperture.
  • Click Link for Detailed Specifications on the Substrate

Features

  • Extinction Ratio: TP:TS > 10 000:1 at 45° Angle of Incidence (AOI)
  • UV Fused Silica Substrate
  • Nine Design Wavelengths from 405 nm to 1550 nm
  • Two Size Options Available: Ø1" and 25.0 mm x 36.0 mm

Thorlabs' polarizing plate beamsplitters are offered with narrowband beamsplitting coatings deposited on the front surface (refer to the reference drawings in the table to the right) designed for various laser wavelengths. Unlike traditional polarizing beamsplitters, which are designed for use at Brewster's angle, these optics are meant to be used at a 45° AOI, which allows for easier mounting. Although the optics can be angle tuned, doing so will result in a degradation of the attainable extinction ratio.

Polarizing beamsplitters are designed such that upon incidence the s-polarized light will be reflected at a 45° angle while the p-polarized light is transmitted. Therefore, these beamsplitters can be thought of as a 45° high reflector with the two reflection bands offset to allow high transmission of the p-polarized component and simultaneous high reflectance of the s-polarized component.

The hard coating deposited onto the surface of these plate beamsplitters offers a higher damage threshold than typically obtained with conventional coatings. For applications where high extinction ratio, transmission, or damage threshold is necessary, these optics are the preferred option over Polarizing Beamsplitter Cubes.

The edge of each round plate beamsplitter is engraved with the item number and an arrow pointing in the intended direction of propagation. Our rectangular beamsplitters feature the engraved item number on the side with the beamsplitter coating, making it easy to differentiate between the front and back surfaces.

Damage Threshold Specifications
Design Wavelength Damage Threshold
532 nm 5 J/cm2 (532 nm, 10 ns, 10 Hz, Ø0.341 mm)
808 nm 5 J/cm2 (810 nm, 10 ns, 10 Hz, Ø0.195 mm)
1064 nm 2 J/cm2 (1054 nm, 10 ns, 10 Hz, Ø1.000 mm)
1550 nm 10 J/cm2 (1542 nm, 10 ns, 10 Hz, Ø0.116 mm)

Transmission Plots of Typical Performance

Data for these beamsplitters was obtained for a 45° angle of incidence. The vertical dashed line indicates the wavelength for optimum performance.
Performance outside of this specified wavelength is not guaranteed and varies from lot to lot.

PBSW-405 Transmission
Click to Enlarge

Click Here to download the transmission data.
PBSW-532 Transmission
Click to Enlarge

Click Here to download the transmission data.
PBSW-633 Transmission
Click to Enlarge

Click Here to download the transmission data.
PBSW-780 Transmission
Click to Enlarge

Click Here to download the transmission data.
PBSW-808 Transmission
Click to Enlarge

Click Here to download the transmission data.
PBSW-1030 Transmission
Click to Enlarge

Click Here to download the transmission data.
PBSW-1064 Transmission
Click to Enlarge

Click Here to download the transmission data.
PBSW-1310 Transmission
Click to Enlarge

Click Here to download the transmission data.
PBSW-1550 Transmission
Click to Enlarge

Click Here to download the transmission data.

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
Damage Threshold Specifications
Design Wavelength Damage Threshold
532 nm 5 J/cm2 (532 nm, 10 ns, 10 Hz, Ø0.341 mm)
808 nm 5 J/cm2 (810 nm, 10 ns, 10 Hz, Ø0.195 mm)
1064 nm 2 J/cm2 (1064 nm, 10 ns, 10 Hz, Ø1.000 mm)
1550 nm 10 J/cm2 (1542 nm, 10 ns, 10 Hz, Ø0.116 mm)

Damage Threshold Data for Thorlabs' Polarizing Plate Beamsplitters

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

In order to illustrate the process of determining whether a given laser system will damage an optic, a number of example calculations of laser induced damage threshold are given below. For assistance with performing similar calculations, we provide a spreadsheet calculator that can be downloaded by clicking the button to the right. To use the calculator, enter the specified LIDT value of the optic under consideration and the relevant parameters of your laser system in the green boxes. The spreadsheet will then calculate a linear power density for CW and pulsed systems, as well as an energy density value for pulsed systems. These values are used to calculate adjusted, scaled LIDT values for the optics based on accepted scaling laws. This calculator assumes a Gaussian beam profile, so a correction factor must be introduced for other beam shapes (uniform, etc.). The LIDT scaling laws are determined from empirical relationships; their accuracy is not guaranteed. Remember that absorption by optics or coatings can significantly reduce LIDT in some spectral regions. These LIDT values are not valid for ultrashort pulses less than one nanosecond in duration.

Intensity Distribution
A Gaussian beam profile has about twice the maximum intensity of a uniform beam profile.

CW Laser Example
Suppose that a CW laser system at 1319 nm produces a 0.5 W Gaussian beam that has a 1/e2 diameter of 10 mm. A naive calculation of the average linear power density of this beam would yield a value of 0.5 W/cm, given by the total power divided by the beam diameter:

CW Wavelength Scaling

However, the maximum power density of a Gaussian beam is about twice the maximum power density of a uniform beam, as shown in the graph to the right. Therefore, a more accurate determination of the maximum linear power density of the system is 1 W/cm.

An AC127-030-C achromatic doublet lens has a specified CW LIDT of 350 W/cm, as tested at 1550 nm. CW damage threshold values typically scale directly with the wavelength of the laser source, so this yields an adjusted LIDT value:

CW Wavelength Scaling

The adjusted LIDT value of 350 W/cm x (1319 nm / 1550 nm) = 298 W/cm is significantly higher than the calculated maximum linear power density of the laser system, so it would be safe to use this doublet lens for this application.

Pulsed Nanosecond Laser Example: Scaling for Different Pulse Durations
Suppose that a pulsed Nd:YAG laser system is frequency tripled to produce a 10 Hz output, consisting of 2 ns output pulses at 355 nm, each with 1 J of energy, in a Gaussian beam with a 1.9 cm beam diameter (1/e2). The average energy density of each pulse is found by dividing the pulse energy by the beam area:

Pulse Energy Density

As described above, the maximum energy density of a Gaussian beam is about twice the average energy density. So, the maximum energy density of this beam is ~0.7 J/cm2.

The energy density of the beam can be compared to the LIDT values of 1 J/cm2 and 3.5 J/cm2 for a BB1-E01 broadband dielectric mirror and an NB1-K08 Nd:YAG laser line mirror, respectively. Both of these LIDT values, while measured at 355 nm, were determined with a 10 ns pulsed laser at 10 Hz. Therefore, an adjustment must be applied for the shorter pulse duration of the system under consideration. As described on the previous tab, LIDT values in the nanosecond pulse regime scale with the square root of the laser pulse duration:

Pulse Length Scaling

This adjustment factor results in LIDT values of 0.45 J/cm2 for the BB1-E01 broadband mirror and 1.6 J/cm2 for the Nd:YAG laser line mirror, which are to be compared with the 0.7 J/cm2 maximum energy density of the beam. While the broadband mirror would likely be damaged by the laser, the more specialized laser line mirror is appropriate for use with this system.

Pulsed Nanosecond Laser Example: Scaling for Different Wavelengths
Suppose that a pulsed laser system emits 10 ns pulses at 2.5 Hz, each with 100 mJ of energy at 1064 nm in a 16 mm diameter beam (1/e2) that must be attenuated with a neutral density filter. For a Gaussian output, these specifications result in a maximum energy density of 0.1 J/cm2. The damage threshold of an NDUV10A Ø25 mm, OD 1.0, reflective neutral density filter is 0.05 J/cm2 for 10 ns pulses at 355 nm, while the damage threshold of the similar NE10A absorptive filter is 10 J/cm2 for 10 ns pulses at 532 nm. As described on the previous tab, the LIDT value of an optic scales with the square root of the wavelength in the nanosecond pulse regime:

Pulse Wavelength Scaling

This scaling gives adjusted LIDT values of 0.08 J/cm2 for the reflective filter and 14 J/cm2 for the absorptive filter. In this case, the absorptive filter is the best choice in order to avoid optical damage.

Pulsed Microsecond Laser Example
Consider a laser system that produces 1 µs pulses, each containing 150 µJ of energy at a repetition rate of 50 kHz, resulting in a relatively high duty cycle of 5%. This system falls somewhere between the regimes of CW and pulsed laser induced damage, and could potentially damage an optic by mechanisms associated with either regime. As a result, both CW and pulsed LIDT values must be compared to the properties of the laser system to ensure safe operation.

If this relatively long-pulse laser emits a Gaussian 12.7 mm diameter beam (1/e2) at 980 nm, then the resulting output has a linear power density of 5.9 W/cm and an energy density of 1.2 x 10-4 J/cm2 per pulse. This can be compared to the LIDT values for a WPQ10E-980 polymer zero-order quarter-wave plate, which are 5 W/cm for CW radiation at 810 nm and 5 J/cm2 for a 10 ns pulse at 810 nm. As before, the CW LIDT of the optic scales linearly with the laser wavelength, resulting in an adjusted CW value of 6 W/cm at 980 nm. On the other hand, the pulsed LIDT scales with the square root of the laser wavelength and the square root of the pulse duration, resulting in an adjusted value of 55 J/cm2 for a 1 µs pulse at 980 nm. The pulsed LIDT of the optic is significantly greater than the energy density of the laser pulse, so individual pulses will not damage the wave plate. However, the large average linear power density of the laser system may cause thermal damage to the optic, much like a high-power CW beam.


Posted Comments:
user  (posted 2019-07-16 10:02:44.267)
Hello. What would happen if I had a P-polarised beam incident on the back of this lens (non-AR coated face) at ~45 deg? What would transmit and what would reflect?
YLohia  (posted 2019-07-19 08:33:06.0)
Hello, thank you for contacting Thorlabs. These beamsplitters are not AR coated. The performance will be quite similar to the specified orientation when used in reverse. I have reached out to you directly regarding this.
polortiz_4  (posted 2019-02-28 10:45:30.987)
Is the extinction ratio equivalent for the transmitted and reflected beams?
nbayconich  (posted 2019-03-01 03:58:24.0)
Thank you for contacting Thorlabs. We do not specify the extinction ratio of the reflected beam for these polarizing beam splitters, however it will be typically between 20:1 and 50:1 for Rs:Rp.
nagler  (posted 2018-12-05 18:29:37.85)
Why is the backside of the polarizing plate beamsplitters not AR coated?
nbayconich  (posted 2018-12-05 03:50:10.0)
Thank you for contacting Thorlabs. The backside of these beamsplitters are designed so that at 45 degrees P polarized light will reflect <1% so no AR coating is necessary.
jcordingley  (posted 2018-08-02 13:13:42.31)
please make a 355nm polarizing plate beamsplitter
YLohia  (posted 2018-08-02 04:06:31.0)
Hello, thank you for the suggestion. I will post this idea on our internal product engineering forum for further consideration.
p.k.molony  (posted 2018-01-05 10:46:00.643)
Is it possible to make these polarizers in 0.5" for a more compact setup?
nbayconich  (posted 2018-01-05 11:21:33.0)
Thank you for contacting Thorlabs. We can provide half inch versions of these polarizing plate beam splitters. I will contact you directly with more information about our custom capabilities.
nkaddy  (posted 2017-08-10 14:35:59.547)
What are the damage thresholds for plate BS for CW lasers? Only pulsed LIDT data is provided.
tfrisch  (posted 2017-08-16 06:00:53.0)
Hello, thank you for contacting Thorlabs. At this time, we only have pulsed laser damage testing, but I will reach out to you directly to discuss the specs of your CW laser. If we have a record of a similar source being used, you could use that as a guide.
escott  (posted 2016-08-11 12:13:14.9)
I have a PBS532 which burned up when exposed to a 300mJ, 6ns, 9mm dia beam (at 45 degree incidence). The damage extends across most of the beam area. Could this be a faulty coating?
jlow  (posted 2016-08-16 10:05:28.0)
Response from Jeremy at Thorlabs: This could be an issue with the coating or it could also be there was some contamination on the optic surface. We will contact you directly about this issue.
sakemi  (posted 2014-02-13 17:05:43.46)
When I was doing alignment procedure with PBSW-808, I found the band width where p-polarized beam cannot transmit became broader larger than 825nm by decreasing the angle of incidence of the laser beam. Is it OK to make the angle 22.5 degree to use PBSW-808 for ultra-short pulses?
besembeson  (posted 2014-02-28 05:10:36.0)
Thanks for contacting Thorlabs. These can indeed be angle tuned. We specify a damage threshold of 5 J/cm2 (810 nm, 10 ns, 10 Hz, Ø0.195 mm). Unlike dielectric and thermal breakdown which is responsible for ns and longer pulses, in the ultra-short regime such as femtosecond lasers, a different type of damage mechanism dominates, which is multiphoton avalanche ionization. We don't have test data yet for this mechanism on this component.
siddarthj  (posted 2013-12-11 22:15:00.193)
What is the alignment procedure to obtain the optimum extinction ratio with the PBSW-808? The best extinction ratio I obtain is 1:4000 for the transmitted arm. I have mounted this in a Km100 mirror mount. Even with a fine tuning of the horizontal and vertical tilt I cannot obtain the 1:22000 extinction ratio shown in your graphs. How sensitive is the optimal angle of PBSW-808 in order to obtain the best extinction ratio? Is the extinction ratio of the PBSW-808 sensitive to the mechanical strain of mounting it in a KM100 mount?
jlow  (posted 2014-01-08 04:56:51.0)
Response from Jeremy at Thorlabs: The first thing to check is to make sure your beam is well collimated. To get the optimum extinction ratio, you would definitely want to use well collimated light and make sure the AOI is as close to 45° as possible (within ±1°). You can put your laser source far away from the PBSW-808 while aligning this to better resolve small angular changes. Using a rotation stage could help as well. You can align for 0° AOI and use the back reflection as guideline, then you can turn the rotation stage to 45°. Excessive stress can cause a decrease in the extinction ratio. You would want to only tighten the setscrew as much as needed to hold the optic in place. I will contact you directly to discuss this with you in more detail.
rscholl  (posted 2012-12-10 14:23:00.0)
Response from Ryan at Thorlabs: thank you your suggestion. We are not currently producing polarizing plate beamsplitters at 405nm but are looking into broadening our product line with the inclusion of this wavelength in the coming months. I will discuss with our optics team whether we can make a special part and contact you.
nic.perney  (posted 2012-12-06 15:04:23.583)
any plans for a 405nm polarizing plate beamsplitter?

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.

Round Polarizing Plate Beamsplitters

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
PBSW-405 Support Documentation
PBSW-405Customer Inspired! Ø1" Polarizing Plate Beamsplitter, 405 nm
$399.30
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PBSW-532 Support Documentation
PBSW-532Ø1" Polarizing Plate Beamsplitter, 532 nm
$399.30
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PBSW-633 Support Documentation
PBSW-633Ø1" Polarizing Plate Beamsplitter, 633 nm
$399.30
Today
PBSW-780 Support Documentation
PBSW-780Ø1" Polarizing Plate Beamsplitter, 780 nm
$399.30
Today
PBSW-808 Support Documentation
PBSW-808Ø1" Polarizing Plate Beamsplitter, 808 nm
$399.30
Today
PBSW-1030 Support Documentation
PBSW-1030Customer Inspired! Ø1" Polarizing Plate Beamsplitter, 1030 nm
$399.30
Lead Time
PBSW-1064 Support Documentation
PBSW-1064Ø1" Polarizing Plate Beamsplitter, 1064 nm
$399.30
Today
PBSW-1310 Support Documentation
PBSW-1310Customer Inspired! Ø1" Polarizing Plate Beamsplitter, 1310 nm
$399.30
Today
PBSW-1550 Support Documentation
PBSW-1550Ø1" Polarizing Plate Beamsplitter, 1550 nm
$399.30
Today

Rectangular Polarizing Plate Beamsplitters

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
PBSW-405R Support Documentation
PBSW-405RCustomer Inspired! 25 x 36 mm Polarizing Plate Beamsplitter, 405 nm
$477.41
Today
PBSW-532R Support Documentation
PBSW-532RCustomer Inspired! 25 x 36 mm Polarizing Plate Beamsplitter, 532 nm
$477.41
Today
PBSW-633R Support Documentation
PBSW-633RCustomer Inspired! 25 x 36 mm Polarizing Plate Beamsplitter, 633 nm
$477.41
Today
PBSW-780R Support Documentation
PBSW-780RCustomer Inspired! 25 x 36 mm Polarizing Plate Beamsplitter, 780 nm
$477.41
Today
PBSW-808R Support Documentation
PBSW-808RCustomer Inspired! 25 x 36 mm Polarizing Plate Beamsplitter, 808 nm
$477.41
Today
PBSW-1030R Support Documentation
PBSW-1030RCustomer Inspired! 25 x 36 mm Polarizing Plate Beamsplitter, 1030 nm
$477.41
Today
PBSW-1064R Support Documentation
PBSW-1064RCustomer Inspired! 25 X 36 mm Polarizing Plate Beamsplitter, 1064 nm
$477.41
Today
PBSW-1310R Support Documentation
PBSW-1310RCustomer Inspired! 25 x 36 mm Polarizing Plate Beamsplitter, 1310 nm
$477.41
Today
PBSW-1550R Support Documentation
PBSW-1550RCustomer Inspired! 25 x 36 mm Polarizing Plate Beamsplitter, 1550 nm
$477.41
5-8 Days
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