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Pellicle Beamsplitters 

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Pellicle Beamsplitters 


  • Eliminates Ghosting
  • No Chromatic Aberration with Focused Beams
  • Minimal Change in Optical Path Length
  • Choose from Uncoated Versions for Beam Sampling or Coated Versions for Beamsplitting
  • Ø1/2", Ø1", and Ø2" Versions Available
  • Surface Quality: 40-20 (Scratch-Dig)

Thorlabs' Ø1/2", Ø1", and Ø2" Pellicle Beamsplitters, which are available with models covering wavelengths from 300 nm - 5 µm, are ideal for use in applications where chromatic dispersion must be minimized (i.e., cases where focused beams are necessary). Pellicle beamsplitters virtually eliminate ghosting since the second surface reflection is superimposed on the first one. However, they are extremely fragile due to the nitrocellulose membrane being only a few microns thick. For each size, Thorlabs offers both coated and uncoated versions. When using a coated optic, light should be incident upon the coated surface first (Note: the coated side of these beamsplitters is the side without the engraving).

The curves pictured below show each of the different coating types as well as the uncoated beamsplitting ratios over a variety of wavelengths. Data was obtained for unpolarized, S-polarized, and P-polarized light incident at 45°. In general, P-polarized light will be transmitted more than S-polarized light, and sinusoidal oscillation is present, resulting from thin film interference effects. See the Tutorial tab for more information about interference effects.

Available Models (Click to View)
Wavelength RangeSplitting Ratio (R:T)
400 nm - 2.4 µm8:92
300 - 400 nm45:55
400 - 700 nm45:55
635 nm33:67
635 nm50:50
700 - 900 nm45:55
1 - 2 µm45:55
3 - 5 µm45:55

Mounting Options
Each pellicle is mounted in a black anodized frame that has two 2-56 tapped mounting holes on the engraved side for mounting them in either our Fixed or Kinematic Pellicle Mounts. Both the fixed and kinematic pellicle mounts are available in versions that accommodate our Ø1/2", Ø1", or Ø2" pellicles. We also offer cage-cube-mounted pellicle beamsplitters, which are pre-mounted in cage cubes, offer protection to the delicate pellicle surface, and are compatible with our 30 mm cage systems. For a direct comparison of the performance of our non-polarizing beamsplitting cube, plate, and pellicle at 633 nm, see the Lab Facts tab.

Please note that the size of the pellicle beamsplitter (e.g., Ø1") refers to the inner diameter of the aluminum frame, not the outer diameter. Hence, these beamsplitters are not compatible with our standard Ø1/2", Ø1", and Ø2" optic mounts. Refer to the Specs tab for a complete table of dimensions.

Handling Precautions
Our pellicle beamsplitters are manufactured from an extremely thin and fragile membrane. Please do not touch the membrane under any circumstances. Compressed or canned air should also not be used on these beamsplitters, as the force of the air is large enough to damage the membrane.

Drawing of Pellicle BS
Membrane MaterialNitrocellulose
Membrane Thickness2 μm, 5 µm for 300-400 nm Version
Index of Refraction (nd)1.5 (@ 550 nm)
Surface Quality40-20 Scratch-Dig
Transmitted Wavefront Erroraλ/2 (Typical)
Reflected Wavefront Errora<λ (Typical)
Frame Thickness3/16" (4.8 mm)
Inner Diameter, I.D.Ø1/2" Size: Ø1/2" (12.7 mm)
Ø1" Size: Ø1" (25.4 mm)
Ø2" Size: Ø2" (50.8 mm)
Outer Diameter, O.D.Ø1/2" Size: Ø0.75" (19.1 mm)
Ø1" Size: Ø1.38" (34.9 mm)
Ø2" Size: Ø2.38" (60.3 mm)
Mounting Hole SpacingbØ1/2" Size: 0.63" (15.9 mm)
Ø1" Size: 1.19" (30.2 mm)
Ø2" Size: 2.19" (55.6 mm)
Temperature Range-40 to 70 °C
  • Angle of Incidence = 45o
  • Denoted by "A" in the figure to the right

Thorlabs Lab Fact: Beamsplitter Package Matters

We present laboratory measurements of the polarization angle, split ratio, and total throughput power of a beam transmitted through Thorlabs plate, cube, and pellicle beamsplitters. While all non-polarizing beamsplitters function similarly, the exact performance is different for different types of beamsplitter. Each type of beamsplitter contains its own advantages and disadvantages compared to other types of beamsplitters. Appropriate choice of beamsplitter is essential to sensitive experimental systems. We present a complete analysis and comparison of optical parameters for three common types of non-polarizing beamsplitters.

For our experiment we used the HRS015 stabilized HeNe as the light source for our investigation. A linear polarizer is used to set the laser beam's polarization axis to 45° in order to provide equal S- and P-polarized light incident on the beamsplitter. The beamsplitter under investigation was then placed in the beampath, and its split beams directed to appropriate detectors. The total power though the optic, polarization states, split ratios, and angle of incidence effects were investigated under this configuration.

The plots below summarize the measured results for all three types of beamsplitters. From these graphs the performance of each optic can be easily compared to one another. The bottom left plot summarizes the results for the total power throughput for each optic. The total power throughput is measured as the fraction of input power. While the plate and pellicle beamsplitters perform rather similarly, the cube shows signs of absorption inside the optic. Additionally, this plot shows the relative insensitivity of throughput power to angle of incidence. The bottom middle graph summarizes the results for the output polarization angle for each optic. The cube shows the most similar polarization angles between the reflected and transmitted beams, with the plate producing the largest difference in polarization between beams. The bottom right plot summarizes the results for the split ratio, as a fraction of input power, for the beamsplitters. Here it can be shown that the plate beamsplitter demonstrates the most ideal for 50/50 power splitting. For details on the experimental setup employed and the results summarized here, please click here.

Legend for Beam Diagrams

Reflected Beam: reflected

Transmitted Beam: Transmitted Beam (Green)

Beamsplitter Selection Guide

Thorlabs offers five main types of beamsplitters: Pellicle, Cube, Plate, Economy, and Polka Dot. Each type has distinct advantages and disadvantages.


Pellicle Beamsplitter

Pellicle Beamsplitters - Pellicle beamsplitters are the best choice when dispersion must be kept to a minimum. They virtually eliminate multiple reflections commonly associated with thicker glass beamsplitters, thus preventing ghosting. In addition, unlike plate beamsplitters, there is a negligible effect on the propagation axis of the transmitted beam with respect to the incident beam.

Pellicle beamsplitters have two disadvantages: They exhibit sinusodial oscillations in the splitting ratio as a function of wavelength, due to thin film interference effects. Click Here for more details. They are also extremely delicate. Since they are fabricated by stretching a nitrocellulose membrane over a flat metal frame, the beamsplitter cannot be touched without destroying the optic. Thorlabs offers pellicle beamsplitters mounted in metal rings for use in kinematic mounts as well as 30 mm cage cube-mounted pellicles.


Polarizing Beamsplitting Cube
Nonpolarizing Beamsplititng Cube

Beamsplitting Cubes
Thorlabs’ beamsplitter cubes are composed of two right-angled prisms. A dielectric coating, which is capable of reflecting and transmitting a portion of the incident beam, is applied to the hypotenuse surface. Since there is only one reflecting surface, this design inherently avoids ghost images, which sometimes occur with plate-type beamsplitters. Antireflection coatings are available on the entrance and exit faces of certain models to minimize back reflections. As well as providing a cost-effective solution, another advantage of the beamsplitting cube is the minimal shift it causes to the path of the transmitted beam. Thorlabs offers both polarizing and nonpolarizing beamsplitting cubes, in mounted and unmounted configurations. Mounted beamsplitters are available that are compatible with our 16 mm cage systems as well as our 30 mm cage systems.

Polarizing Beamsplitters - Thorlabs’ polarizing plate and cube beamsplitters split randomly polarized beams into two orthogonal, linearly polarized components (S and P), as shown in the diagram to the right. S-polarized light is reflected at a 90° angle with respect to the incident beam while p-polarized light is transmitted. Polarizing beamsplitters are useful in applications where the two polarization components are to be analyzed or used simultaneously. Thorlabs offers broadband 16 mm cage cube-mounted, broadband 30 mm cage cube-mounted, and broadband unmounted polarizing beamsplitter cubes, as well as laser line 30 mm cage cube-mounted and laser line unmounted cubes. For applications requiring higher power, we also offer high-power polarizing beamsplitting cubes.

Non-Polarizing Beamsplitting Cubes - These cubes provide a 50:50 splitting ratio that is nearly independent of the polarization of the incident light. The low polarization dependence of the metallic-dielectric coating allows the transmission and reflection for s- and p-polarization states to be within 10% of each other. These beamsplitters are particularly useful with randomly polarized lasers and are specifically designed for applications in which polarization effects must be minimized. Thorlabs offers 16 mm cage cube-mounted, 30 mm cage cube-mounted, and unmounted beamsplitter cubes.


Plate Beamsplitters

Plate Beamsplitters - Thorlabs' plate beamsplitters are optimized for an incidence angle of 45° and feature a dielectric coating on the front surface for long-term stability. To help reduce unwanted interference effects (e.g., ghost images) caused by the interaction of light reflected from the front and back surfaces of the optic, a wedge has been added to the round versions of these beamsplitters. Dispersion, ghosting, and shifting of the beam may all be potential problems, however. These are the best choice for a general-purpose beamsplitter. Thorlabs offers both polarizing and nonpolarizing plate beamsplitters.


Economy Beamsplitters

Economy Beamsplitters - These are the most cost effective of all the beamsplitter types. Thorlabs' economy beamsplitters, which have an exposed oxide coating on one side and are uncoated on the other side, are designed to have either a 50:50 or 30:70 splitting ratio throughout the visible spectrum (450 - 650 nm) when used with unpolarized light incident at 45°.

Please note that the Fresnel reflections off of the uncoated back surface of these economy beamsplitters can lead to interference effects in the reflected beam. For applications sensitive to these effects, consider using a beamsplitting cube or a pellicle beamsplitter.


Polka Dot Beamsplitters - This type of beamsplitter consists of a glass substrate with a vacuum-deposited reflective coating that is applied over an array of apertures, giving the beamsplitter a "polka dot" appearance. Half of the incident beam is reflected from the coating, and half of the beam is transmitted through the uncoated portion of the substrate.

Polka Dot Beamsplitter

Polka dot beamsplitters are useful over a wide wavelength range and are negligibly angle sensitive, which makes them ideal for splitting the energy emitted from a radiant source. These are not recommended for imaging applications, such as interferometry, as the polka dot pattern will affect the image.

Thin-Film Interference Effect

Reflectance Curve showing Thin-Film Interference Effects

The plots below, which show transmission as a function of wavelength, depict a sinusoidal fluctuation that is caused by interference effects. These effects will occur for all pellicle beamsplitters and are sometimes averaged out when data is displayed.

The graph to the right depicts the measured reflectance of an 8:92 beam sampler without averaging the sinusoidal oscillations that result from thin film interference. The frequency and amplitude of the pattern depends several factors, such as the thickness of the film, the thickness of any coating present, the angle of incidence of the incoming light, the polarization of the incoming light, and the bandwidth of the light incident on the pellicle.

What is a Thin Film?
A layer of material is referred to as a thin film if the thickness of the layer is on the order of the wavelength of incident radiation in the film medium. The relationship between the wavelength of light in air and that in the film is given by

Relationship between wavelength in air and film

For the pellicle beamsplitters featured here, the information under the Specs tab states that nfilm = 1.5 at 550 nm. Therefore, for this incident wavelength, the wavelength in the pellicle membrane itself is

Wavelength of 550 nm light in pellicle beamsplitter

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Posted Comments:
Poster: htu
Posted Date: 2014-01-16 12:01:27.18
I am interested in pellicle BP145B3. It seems to display an unusual effect in my experiments. If it has a uniform dielectric (not metal) coating, as shown in some answers of this feedback section, can I find the same coating in your plate or cube beamsplitters? How thick is the coating on top of the substrate?
Poster: Georgy.Onishchukov
Posted Date: 2013-10-08 18:44:37.8
what is the CW damage power for uncoated pellicles?
Poster: jlow
Posted Date: 2013-10-10 16:00:00.0
Response from Jeremy at Thorlabs: We do not have a CW damage threshold spec for the uncoated pellicles but we recommend limiting the incident intensity to <20W/cm^2.
Poster: cumaisse
Posted Date: 2013-08-20 10:15:46.407
I'm using a 100 fs laser at 800 nm and was wondering what's the fluence or power or intensity this pellicle beam splitter are made for. I didn't find any information thereabout on the specs. Thank you in advance for your answer
Poster: tcohen
Posted Date: 2013-08-22 14:54:00.0
Response from Tim at Thorlabs: Thank you for contacting us. We have used only low fs pulse energies for these and do not yet have a maximum empirical value for fs damage threshold. However, we have had customers successfully use the BP145B2 with no damage and the following beam properties: Beam radius: 3 mm; Repetition rate: 1 kHz; Wavelength: 775 nm; Pulse width: about 250 fs; Pulse energy: 0.8 mJ.
Poster: jiri.vodak
Posted Date: 2013-06-20 11:05:56.087
Few comments below someone asked if pellicles can be used down to 350 nm, I would ask further if they can be used down to 200, 250 nm (also the possibility of 50/50 coating). As we plan to make comparative measurements fluctuations in transmittance shouldn't be of much concern for us. The questions is if we would get any intensity through at all. Usage of pellicle would simplify our apparatus significantly.
Poster: pbui
Posted Date: 2013-06-21 14:41:00.0
Response from Phong at Thorlabs: Nitrocellulose is not transmissive at 200 nm, but it should work for 250 nm. Depending on the thickness of the layer, you can expect anywhere from 55-70% Transmission with an average Reflection of 8% at 45° for unpolarized light. If you are interested in operating at 200 nm, then we may be able to offer a custom pellicle. We will contact you directly to discuss this.
Posted Date: 2013-06-01 10:50:34.983
It would be great if you could make pellicles that are HR coated (R~100%). When dealing with terahertz light, a common task is to superimpose a near-infrared optical pulse onto a terahertz one. Normally this is done using mirrors with holes in them or ITO (both of which reflect terahertz and transmit near-infrared). Alternatively, you can use pellicles to transmit terahertz and reflect infrared (as the pellicles are too thin to be seen by the terahertz). Unfortunately, if you use a 50:50 beamsplitter, you've lost half your light, not to mention the thin film effects of the beamsplitter on your spectrum. An HR-coated pellicle would be perfect for this sort of situation.
Poster: tcohen
Posted Date: 2013-06-06 12:17:00.0
Response from Tim at Thorlabs: Thank you for your feedback. Although this may not be useful as a catalog product for the majority of our users we can offer a lot of custom optics. I don’t see that you left any contact information but if you would like to pursue this product further please contact us at techsupport@thorlabs.com.
Poster: klaus.albers
Posted Date: 2013-02-19 10:22:12.03
Hello, is there any reason not to use the BP108 at 350 nm? Spec starts at 400 nm. Thank you and best regards Klaus Albers
Poster: tcohen
Posted Date: 2013-02-21 15:04:00.0
Response from Tim at Thorlabs to Klaus: Nitrocellulose does display stronger absorption as we go farther into the UV. You will find that the oscillations occur more rapidly and that you will have some increased absorption but you will certainly be able to use this at 350nm. If you aren’t working with higher powers, this will be fine.
Poster: tcohen
Posted Date: 2012-09-20 12:09:00.0
Response from Tim at Thorlabs: We currently don’t have tested data for fs pulses on this optic. Because the damage mechanism for fs pulses will be different than when working with ns pulses or CW, these values cannot be directly translated. I will contact you directly to discuss your equipment and to coordinate an effort to get more data.
Poster: phyvjc
Posted Date: 2012-09-17 05:35:45.0
Hello, can you tell me the damage threshold for this BS if used with a pulsed laser (100fs; 780nm)? Thank you very much, Jose Viana-Gomes Dep. of Physics - NUS, Singapore
Posted Date: 2012-09-05 16:24:40.0
Has any of your Pellicle Beamsplitters a metal coating?
Poster: tcohen
Posted Date: 2012-09-05 13:44:00.0
Response from Tim at Thorlabs: Our Pellicles utilize dielectric coatings. We may be able to offer this as a special. Please contact us at techsupport@thorlabs.com to discuss your requirements.
Poster: tcohen
Posted Date: 2012-07-17 13:50:00.0
Response from Tim at Thorlabs: Thank you for your feedback. I see you have also sent an email further detailing this request. I will contact you directly to discuss your application.
Poster: jinwang
Posted Date: 2012-07-14 21:44:38.0
Can you coat the pellicle beam splitters to get a 92:8 split ratio to match the 8:92 normal ratio?
Poster: tcohen
Posted Date: 2012-06-28 11:13:00.0
Response from Tim at Thorlabs: Pellicle beamsplitters are extremely fragile due to the thickness of the membrane. They should not be touched to clean and they should be kept from high humidity. Forceful compressed air should also be avoided as this can rupture the membrane. They must be very gently blown to clean. The light force of a small hand pumped air blower will work. We will add a cleaning tab to explain their fragility. Pellicles display an etalon effect as shown in the “Tutorial” tab. As we change the AOI, we are altering this etalon and the interference rolls off with respect to the wavelength. As such, we can effectively tune the R/T ratio within the amplitude of the interference effect by altering the AOI.
Poster: joekkrause
Posted Date: 2012-06-27 21:32:11.0
How sensitive to humidity are these beam splitters? What would you recommend them to be cleaned with? Can the transmission:reflection ratio be changed by rotating it off of the exact 45 degree angle?
Poster: bdada
Posted Date: 2012-02-10 19:41:00.0
Response from Buki at Thorlabs to Pkhulbe: Thank you for participating in our feedback forum. We will look into your request further and contact you directly.
Poster: Pkhulbe
Posted Date: 2012-02-08 16:12:51.0
Is it possible for Thorlabs to coat a pellicle that has both p-polarization and s-polarization reflectivity between 5-10% at 45 degree angle of incidence angle for 1200 nm? Thanks Pramod K. Khulbe
Poster: ernst.fill
Posted Date: 2011-11-15 12:39:47.0
Do you have any data on the absorptivity of the material the pellicle is made of (I suppose nitrocellulose). Our problem is that we have high average power. From the absorption we could calculate the temperature increase upon irradiation. Wavelengths are 1040 nm and 520 nm. Thanks, Ernst
Poster: jvigroux
Posted Date: 2011-11-15 10:57:00.0
A response from Julien at Thorlabs: Dear Ernst, thank you for your inquiry! We unfortunately do not have this data at hand. We will contact you directly in order to see what is the most efficient way to obtain the data you need.
Poster: jjurado
Posted Date: 2011-06-15 12:05:00.0
Response from Javier at Thorlabs to y_karp: Thank you very much for contacting us. Although we have not determined the laser induce damage threshold experimentally for our coated and uncoated pellicle beamsplitters; however, as a guideline, we recommend limiting the incident power density to 2 W/cm^2 for the coated pellicles, and 20 W/cm^2 for the uncoated ones. We currently do not have a pulsed LIDT spec. I will contact you directly for further support.
Poster: y_karp
Posted Date: 2011-06-10 09:00:05.0
Hi, I would like to use the pellicle beam splitter (BP245B1) with two Laser beams at 532 (Laser Pointer <14mw) and at 355 short laser pulses (6ns,500Hz,0.5 mJ). I would like to know what the damage threshold is. Thanks, Yahel Karpol.
Poster: Thorlabs
Posted Date: 2010-11-29 18:36:24.0
Response from Javier at Thorlabs to dheeruchief: The main soecifications that you want to take into account when choosing a beamsplitter are the desired operating wavelength, reflection/transmission split ratio, size, substrate, and thickness. Some applications are sensitive to ghosting effects, so this also needs to be considered. Also, damage threshold may become a concern when using sources with high power outputs.
Poster: dheeruchief
Posted Date: 2010-11-29 05:18:43.0
I am an engineer of Supplier company of optical instruments in India, but I want to read about beam Splitter and wants to know the importance of Specifications for collecting a complete Inquiry. Thanks & Regards Dhirendra Nath Macwin India Kanpur
Poster: Thorlabs
Posted Date: 2010-07-06 10:31:20.0
Response from Javier at Thorlabs to r.j.collins: thank you for your feedback. None of the different coatings of our pellicle beamsplitters is designed to perform in this manner. For example, the coating of the BP150, 50:50 split ratio (@ 635nm) yields, on average, about 70% transmission at 900 nm, and 38% reflection at 800 nm, which does not comply with your requirements. I would suggest considering our DMLP900 dichroic mirror/beamsplitter. It is designed for 90% reflection from 400-872nm and 90% transmission from 932-1300nm (http://www.thorlabs.com/NewGroupPage9.cfm?ObjectGroup_ID=3313).
Poster: r.j.collins
Posted Date: 2010-07-05 11:29:49.0
We are looking to use a pellicle beamsplitter at 45 degrees incidnece in an application whcih requires high transmission (>80%) of light with a wavelength of approximatly 900 nm to 1 um and high reflectivity (again >80%) of wavelengths below approximatly 800 nm. Are any of your pellicle beamsplitters suitable for this application?
Poster: apalmentieri
Posted Date: 2009-12-07 19:37:44.0
A response from Adam at Thorlabs: As an optical coating is shifted from an angle of incidence of 45 degrees to 0 degrees, the specified wavelength range is increased by ~10%. For instance, the 400-700nm range at 45 degrees would become ~440-770 at 0 degrees. Please note the uncoated pellicle should still exhibt 8/92 %R/%T performance at 0 degrees. We can also supply curves, but I will have to contact you for more information about the exact pellicles you were considering.
Poster: mwagnerikp.tu-darmstadt.de
Posted Date: 2009-12-03 10:33:57.0
I want to use a pellice beam splitter inside a TiSa Cavity to produce higher repetition rate. Therefore I need a incedent angle of zero degree. What are the reflection spezification of coated and uncoated splitter? thanks a lot
Poster: klee
Posted Date: 2009-11-11 17:07:51.0
A response from Ken at Thorlabs to marcoc: 1) Customer feedback has shown that an Uncoated Pellicle (BP108, BP208) can withstand pulsed power of at least 25 MW/cm2. 2) When using broadband light without a line spectrum the interference effects should "wash" out to the Average R/T as advertised. For a 20nm to 30nm bandwidth, we can specially select Pellicles by thickness and coating to meet most specifications at a specific angle, wavelength, and incoming state of polarization (or unpolarized). We would provide a transmission scan with the part to show the results. The wider the bandwidth, the thinner the pellicle has to be to try to cover the full range. Please let us know if you would like a quotation for this.
Poster: marcoc
Posted Date: 2009-11-10 16:50:24.0
Hi, I would like to use the pellice beamsplitter with short laser pulses (coming out of a 50fs amplifier). I have 2 questions: 1. damage threshold 2. is there any problem in using it with "broad band" light ? Im afraid that when having 20-30nm bandwidth I might have strange interference between the different components. Thanks, marco cammarata
Poster: apalmentieri
Posted Date: 2009-07-01 20:09:19.0
A response from Adam at Thorlabs: Most of the pellicles we provide have a dielectric coating that provides the beamsplitting properties. We have done custom metal coating on these beamsplitters in the past. I will contact you via email to get more information about your specific coating needs.
Poster: tesar
Posted Date: 2009-07-01 18:01:54.0
Specification of coating material would be useful. I need a pellicle with a metal coating.
Poster: apalmentieri
Posted Date: 2009-06-25 16:46:30.0
A response from Adam at Thorlabs to G.moss1: We currently do not specify an exact tolerance on the thickness. A nominal tolerance would be +/- 2um, so 1.76um is very close to being within specification. It would be great if we could get some more information about the mathematic code. I will send you an email shortly.
Poster: g.moss1
Posted Date: 2009-06-25 10:33:44.0
I have worked through the maths regarding the thin film effects on reflection and can reproduce the oscillatory plot shown in the tutorial. (I dont reproduce the smaller amplitude of oscillations at low wavelength as I did the ideal case.) The plot matches with the one in the tutorial for a pellicle thickness of 1.76 microns. Is this within spec? Do you have an error on the thickness? (i.e. is the thickness 2+-0.5 or 1.75+-0.01?) Im happy to share the mathematica code or its output with you if you are interested. Gregory Moss
Poster: alexey.chugreev
Posted Date: 2009-04-18 08:03:09.0
Dear Sir or Madam, I just sending you some my notes about pellicle beamsplitters. Alexey -------------------------- Dear ******, In some experiments I used pellicle uncoated (8/92%) beamsplitters from Thorlabs. Placed at some angle (it should be the Brewster angle for nitrocellulose I guess), it is sensitive to the light polarization. The contrast of such polarizer (for the reflected light only!) is not very good. Let us say, in the reflected light you could obtain 7% of p-polarization and 1% of s-polarization. Transmitted light will be slightly polarized (93% and 99%). But may be better if adjusted more carefully. Funny, no information on polarization properties exists at Thorlabs, Newport, Melles Griot etc web-sites.
Poster: Greg
Posted Date: 2009-04-13 15:00:41.0
A response from Greg at Thorlabs to diana.tsou: Thank you for your interest in our Pellicle Beamsplitters. We do not currently have data on the BP245B1 at 325 nm, but our Optics department will run a scan for you. Once I have this data I will e-mail you and update the graphs on this webpage.
Poster: diana.tsou
Posted Date: 2009-04-13 13:32:08.0
Do you have T/R data near 325 nm? Is nitrocellulose absorbing at 325 nm?
Poster: sbarry
Posted Date: 2008-12-15 15:11:52.0
I think we need to include a specification for damage threshold here. Newport, for example, shows a spec of 2W/cm^2. Another spec Newport has that we dont is thickness uniformity. Theirs is specd as +/-0.06 fringes/mm at 550nm.
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Pellicle Beamsplitters, Uncoated, 8:92 (R:T)

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BP058 Support Documentation
BP058 Ø1/2" Pellicle Beamsplitter, Uncoated for 8:92 (R:T) Split Ratio for 400-2400 nm
BP108 Support Documentation
BP108 Ø1" Pellicle Beamsplitter, Uncoated for 8:92 (R:T) Split Ratio for 400-2400 nm
BP208 Support Documentation
BP208 Ø2" Pellicle Beamsplitter, Uncoated for 8:92 (R:T) Split Ratio for 400-2400 nm
Pellicle Beamsplitters, Coated for 300 - 400 nm, 45:55 (R:T)

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BP145B5 Support Documentation
BP145B5 Ø1" Pellicle Beamsplitter, Coated for 45:55 (R:T) Split Ratio for 300-400 nm
BP245B5 Support Documentation
BP245B5 Ø2" Pellicle Beamsplitter, Coated for 45:55 (R:T) Split Ratio for 300-400 nm
Pellicle Beamsplitters, Coated for 400 - 700 nm, 45:55 (R:T)

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BP545B1 Support Documentation
BP545B1 Ø1/2" Pellicle Beamsplitter, Coated for 45:55 (R:T) Split Ratio for 400-700 nm
BP145B1 Support Documentation
BP145B1 Ø1" Pellicle Beamsplitter, Coated for 45:55 (R:T) Split Ratio for 400-700 nm
BP245B1 Support Documentation
BP245B1 Ø2" Pellicle Beamsplitter, Coated for 45:55 (R:T) Split Ratio for 400-700 nm
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Pellicle Beamsplitters, Coated for 635 nm, 33:67 (R:T)

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BP533 Support Documentation
BP533 Ø1/2" Pellicle Beamsplitter, Coated for 33:67 (R:T) Split Ratio at 635 nm
BP133 Support Documentation
BP133 Ø1" Pellicle Beamsplitter, Coated for 33:67 (R:T) Split Ratio at 635 nm
BP233 Support Documentation
BP233 Ø2" Pellicle Beamsplitter, Coated for 33:67 (R:T) Split Ratio at 635 nm
Pellicle Beamsplitters, Coated for 635 nm, 50:50 (R:T)

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BP550 Support Documentation
BP550 Ø1/2" Pellicle Beamsplitter, Coated for 50:50 (R:T) Split Ratio at 635 nm
BP150 Support Documentation
BP150 Ø1" Pellicle Beamsplitter, Coated for 50:50 (R:T) Split Ratio at 635 nm
BP250 Support Documentation
BP250 Ø2" Pellicle Beamsplitter, Coated for 50:50 (R:T) Split Ratio at 635 nm
Pellicle Beamsplitters, Coated for 700 - 900 nm, 45:55 (R:T)

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BP545B2 Support Documentation
BP545B2 Ø1/2" Pellicle Beamsplitter, Coated for 45:55 (R:T) Split Ratio for 700-900 nm
BP145B2 Support Documentation
BP145B2 Ø1" Pellicle Beamsplitter, Coated for 45:55 (R:T) Split Ratio for 700-900 nm
BP245B2 Support Documentation
BP245B2 Ø2" Pellicle Beamsplitter, Coated for 45:55 (R:T) Split Ratio for 700-900 nm
Pellicle Beamsplitters, Coated for 1 - 2 µm, 45:55 (R:T)

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Based on your currency / country selection, your order will ship from Newton, New Jersey  
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BP545B3 Support Documentation
BP545B3 Ø1/2" Pellicle Beamsplitter, Coated for 45:55 (R:T) Split Ratio for 1-2 µm
BP145B3 Support Documentation
BP145B3 Ø1" Pellicle Beamsplitter, Coated for 45:55 (R:T) Split Ratio for 1-2 µm
BP245B3 Support Documentation
BP245B3 Ø2" Pellicle Beamsplitter, Coated for 45:55 (R:T) Split Ratio for 1-2 µm
Pellicle Beamsplitters, Coated for 3 - 5 µm, 45:55 (R:T)

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Based on your currency / country selection, your order will ship from Newton, New Jersey  
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BP545B4 Support Documentation
BP545B4 Ø1/2" Pellicle Beamsplitter, Coated for 45:55 (R:T) Split Ratio for 3-5 µm
BP145B4 Support Documentation
BP145B4 Ø1" Pellicle Beamsplitter, Coated for 45:55 (R:T) Split Ratio for 3-5 µm
Pellicle Mounts
Closeup view of pellicle taps

Thorlabs offers both fixed and kinematic mounting options for our Ø1/2", Ø1", and Ø2" pellicle beamsplitters. Two 2-56 capscrews included with the mount are used to attach the pellicle. Pellicle mounts are post-mountable via 8-32 or M4 x 0.7 tapped mounting holes (KM05BP and KM05BP/M), or #8 (M4) counterbores (all other pellicle mounts).

Click here for more information about our fixed pellicle mounts.
Click here for more information about our kinematic pellicle mounts.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
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BP057 Support Documentation
BP057 Ø1/2" Fixed Pellicle Mount
BP107 Support Documentation
BP107 Ø1" Fixed Pellicle Mount
BP207 Support Documentation
BP207 Ø2" Fixed Pellicle Mount
KM05BP Support Documentation
KM05BP Kinematic Mount for Ø1/2" Pellicle Optics
KM100BP Support Documentation
KM100BP Kinematic Mount for Ø1" Pellicle Optics
KM200BP Support Documentation
KM200BP Kinematic Mount for Ø2" Pellicle Optics
+1 Qty Docs Part Number - Metric Price Available / Ships
KM05BP/M Support Documentation
KM05BP/M Kinematic Mount for Ø1/2" Pellicle Optics
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