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Glan-Thompson Polarizers


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Glan-Thompson Polarizers

Item #GTH5GTH10
Extinction Ratioa100,000:1
MaterialHigh Optical Grade Calcite
Wavefront
Distortion
≤λ/4 Over Clear Aperture
Surface Qualityb20-10 Scratch-Dig
Wavelength Range350 nm to 2.3 µm
Aperture5 mm x 5 mm10 mm x 10 mm
Dimensions
C18 mm33 mm
D6 mm11 mm
  • For the transmitted beam. The extinction ratio (ER) is the ratio of the maximum transmission of a linear polarized signal when the polarizer’s axis is aligned with the signal to the minimum transmission when the polarizer is rotated by 90°.
  • For Input and Output Faces, Side Ports 80-50.

Unmounted Glan-Thompson Schematic

Features

  • Wide Field of View: 40° Typical
  • High Extinction Ratio: 100,000:1
  • 350 nm to 2.3 μm Operation for Uncoated Prisms
  • AR-Coated Versions for 350 - 700 nm or 650 - 1050 nm Range
  • Highest Grade Optical Calcite
  • Cemented Prisms
  • Damage Threshold: 1 W/cm2

Thorlabs' unmounted Glan-Thompson calcite polarizers offer the widest field of view of the calcite polarizers while maintaining a high extinction ratio. These unmounted prisms are ideal for custom applications; versions mounted in a round aluminum housing are also available. The GTH5 polarizers have a 5 mm x 5 mm aperture, while the GTH10 polarizers have a 10 mm x 10 mm aperture.

Both uncoated and coated polarizers are available. The uncoated polarizers are designed for use in the 350 nm to 2.3 μm range, while coated versions are available for the 350 - 700 nm or 650 -1050 nm range. Please see the Graphs tab for coating reflectivity data.

Glan-Thompson polarizers consist of two cemented prisms made from the highest optical grade calcite. Unpolarized light enters the polarizer, then is split at the intersection of the two crystals allowing s-polarized (e-ray) light to continue and p-polarized light (o-ray) to be reflected as shown in the diagram above. Due to the large field of view, these polarizers can be used for highly converging or diverging beams.

Note: As with all Glan-Thompson polarizers, the maximum optical intensity is limited by the cemented prism interface. For high-power applications, Thorlabs offers Glan Laser polarizers, which can handle power densities up to 500 W/cm2 (CW).

Glan Thompson Field of View Drawing

The transmission graph below shows the typical transmission of the uncoated GTH10 series of calcite Glan-Thompson polarizers, including any internal losses. The transmission is valid for linearly polarized light aligned with the mark on the housing of the polarizer. Calcite is a natural material, and thus transmission can vary significantly, particularly in the UV and IR. Consequently, the performance data shown below may vary from lot to lot and is not guaranteed.

Glan-Thompson Calcite Polarizer
Polarization-Dependent Refraction - Glan-Thompson Calcite Polarizer

Our calcite polarizers are all based on high-grade, birefringent, calcite crystals. Due to the birefringent structure of calcite, a differential delay is created between two orthogonally polarized waves traveling in the crystal. As shown in the image to the right, this birefringent structure creates a polarization-dependent refraction that effectively steers the polarization planes in two angles. While the extraordinary plane will travel straight through the crystal, the ordinary plane will exit the crystal at an angle proportional to the wavelength as well as the length of the crystal.

A calcite polarizer can be designed as either a polarization splitter/combiner or as a polarizer element that removes the angled, orthogonally polarized component of a beam. Our calcite polarizers are typically built out of two prisms, as shown in the drawing to the right. Since calcite is a soft crystal that is easily damaged, almost all of our calcite polarizers are offered in metal housings. With convenient threadings and adapters, these housings can easily be mounted into our opto-mechanical products.

Field of View
Calcite Polarizer Field of View (FOV)

Thorlabs' Calcite Polarizers
Glan-Laser PolarizersGlan-Taylor PolarizersWollaston Polarizer
Mounted Glan-Thompson Polarizers
Unmounted Glan-Thompson Polarizers
Double Glan-Taylor PolarizerBeam Displacers

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 high thresholds for laser damage, up to 25 W/cm2, as well as 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), and rutile (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
Polarizer TypeWavelength RangeExtinction RatioTransmissionaAvailable Sizes
Wire Grid Polarizers on Glass Substrates420 nm - 700 nm>800:112.5 mm x 12.5 mm, Ø25.0 mmb,
25.0 mm x 25.0 mm,
and 50.0 mm x 50.0 mm
250 nm - 4 µm>10:1 from 250 nm - 4 µm
>100:1 from 300 nm - 4 µm
>1000:1 from 600 nm - 4 µm
>10,000:1 from 2.25 µm - 4 µm
12.5 mm x 12.5 mm, Ø25.0 mmb,
25.0 mm x 25.0 mm,
and 50.0 mm x 50.0 mm
Holographic Wire Grid Polarizers2 µm - 12 µm150:1 at 3 µm
300:1 at 10 µm
Ø25.0 mmb and Ø50.0 mmb
2 µm - 9 µm150:1 at 3 µm
300:1 at 8 µm
2 µm - 30 µm150:1 at 3 µm
300:1 at 15 µm
2 µm - 18 µm150:1 at 3 µm
300:1 at 10 µm
MIR Wire Grid Polarizers on Silicon Substrates3 µm - 5 µm>1000:112.5 mm x 12.5 mmb, Ø25.0 mmb,
25.0 mm x 25.0 mmb,
and 50.0 mm x 50.0 mmb
7 µm - 15 µm>10,000:112.5 mm x 12.5 mmb, Ø25.0 mmb,
25.0 mm x 25.0 mmb,
and 50.0 mm x 50.0 mmb
Film Polarizers
Polarizer TypeWavelength RangeExtinction RatioTransmissionaAvailable Sizes
Nanoparticle Linear Film Polarizers365 nm - 395 nm>1000:1 from 365 nm - 395 nm
>10,000:1 from 369 nm - 390 nm
>100,000:1 from 372 nm - 388 nm
Ø12.5 mmc and Ø25.0 mmd
480 nm - 550 nm>10,000:1 from 480 nm - 550 nmØ12.5 mmc and Ø25.0 mmd
500 nm - 720 nm>10,000:1 from 500 nm - 720 nmØ12.5 mmc and Ø25.0 mmd
550 nm - 1500 nm>10,000:1 from 550 nm - 1500 nm
>100,000:1 from 600 nm - 1200 nm
Ø12.5 mmc and Ø25.0 mmd
650 nm - 2000 nm>1000:1 from 650 nm - 2000 nm
>10,000:1 from 750 nm - 1800 nm
>100,000:1 from 850 nm - 1600 nm
Ø12.5 mmc and Ø25.0 mmd
1 µm - 3 µm>1000:1 from 1 µm - 3 µm
>10,000:1 from 1.2 µm - 3 µm
Ø12.5 mmc and Ø25.0 mmd
1.5 µm - 5 µm>1000:1 from 1.5 µm - 5 µm
>10,000:1 from 2 µm - 4.5 µm
Ø12.5 mmc and Ø25.0 mmd
Economy Film Polarizers400 nm - 700 nm>100:1 from 400 nm - 500 nm
>1000:1 from 500 nm - 700 nm
>5000:1 from 530 nm - 690 nm
2" x 2"
Economy Laminated Film Polarizers400 nm - 700 nm>100:1 from 400 nm - 500 nm
>1000:1 from 500 nm - 700 nm
>5000:1 from 530 nm - 690 nm
Ø1/2", Ø1", and Ø2"
600 nm - 1100 nm>1000:1 from 600 nm - 950 nm
>400:1 from 600 nm - 1100 nm
Ø1/2", Ø1", and Ø2"
1100 nm - 1630 nm>5000:1 from 1300 nm - 1400 nm
>1000:1 from 1260 nm - 1480 nm
>100:1 from 1100 nm - 1630 nm
Ø1/2", Ø1", Ø2"
Beamsplitting Polarizers
Polarizer TypeWavelength RangeExtinction RatioTransmissionaAvailable Sizes
Polarizing Plate Beamsplitters532 nm10,000:1Ø1"
633 nm
780 nm
808 nm
1064 nm
1550 nm
Broadband Polarizing Beamsplitter Cubes
(Unmounted, 16 mm Cage Cube, or 30 mm Cage Cube)
420 nm - 680 nm1000:15 mm, 10 mm, 1/2", 20 mme, and 1"e
620 nm - 1000 nm
900 nm - 1300 nm
1200 nm - 1600 nm
Wire Grid Polarizing Beamsplitter Cubes (Unmounted)400 nm - 700 nm>1000:11"
Laser-Line Polarizing Beamsplitter Cubes
(Unmounted or 30 mm Cage Cube)
532 nm3000:11"e
633 nm
780 nm
980 nm
1064 nm
1550 nm
High-Power Laser-Line Polarizing Beamsplitter Cubes
(Unmounted or 30 mm Cage Cube)
405 nm2000:11"e
532 nm
780 - 808 nm
1064 nm
alpha-BBO Polarizers
Polarizer TypeWavelength RangeExtinction RatioTransmissionaAvailable Sizes
alpha-BBO Glan-Laser Polarizers210 nm - 450 nm100,000:15 mmb and 10 mmb
(Clear Aperture, Square)
220 nm - 370 nm
405 nm
Calcite Polarizers
Polarizer TypeWavelength RangeExtinction RatioTransmissiona,gAvailable Sizes
Glan-Laser Calcite Polarizers350 nmf - 2.3 µm (Uncoated)100,000:15 mmb, 10 mmi, and 15 mmb
(Clear Aperture, Square)
350 nmf - 700 nm (A Coated)
650 nm - 1050 nm (B Coated)
1050 nm - 1700 nm (C Coated)
1064 nm (V Coated)h
Glan-Taylor Calcite Polarizers350 nmf - 2.3 µm (Uncoated)5 mmb, 10 mmb, and 15 mmb
(Clear Aperture, Square)
350 nmf - 700 nm (A Coated)
650 nm - 1050 nm (B Coated)
1050 nm - 1700 nm (C Coated)
Glan-Thompson Calcite Polarizers
(Unmounted or Mounted)
350 nmf - 2.3 µm (Uncoated)5 mmi and 10 mmi
(Clear Aperture, Square)
350 nmf - 700 nm (A Coated)
650 nm - 1050 nm (B Coated)
Double Glan-Taylor Calcite Polarizers350 nmf - 2.3 µm (Uncoated)9 mmb
(Clear Aperture, Square)
Calcite Beam Displacers350 nmf - 2.3 µm (Uncoated)10 mmb
(Clear Aperture, Square)
Wollaston Prism Polarizers350 nmf - 2.3 µm (Uncoated)10 mmi
(Clear Aperture, Square)
350 nmf - 700 nm (A Coated)
650 nm - 1050 nm (B Coated)
Rutile Polarizers
Polarizer TypeWavelength RangeExtinction RatioTransmissionaAvailable Sizes
Rutile TiO2 Polarizers2.2 µm - 4 µm100,000:19.1 mm x 9.5 mm x 9.5 mmb and
10.7 mm x 15.9 mm x 15.9 mmb
  • 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 that indicates the polarization axis.
  • 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).
  • 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.
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Posted Comments:
Poster: jlow
Posted Date: 2013-08-15 09:31:00.0
Response from Jeremy at Thorlabs: The beam diameter needs to be taken into account when considering whether this would work for you. For 355nm, we also have the alpha-BBO glan-laser polarizer (http://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=5093) which might be more suitable. I will contact you directly to discuss about your application further.
Poster: rodrigo.aviles
Posted Date: 2013-08-15 13:55:35.873
I am planning to use this prism with a 355 nm laser. this is a pulsed laser delivering up to 20 uJ energy per pulse. The average power that i will use is 500 mW and the pulses are 65 nsec the rep rate is 30Khz. Please let me know if this can stand this amount of power if not, can I use the GL5-A (glan laser polarizer) which one would be better for my application? Best regards R. Aviles
Poster: Thorlabs
Posted Date: 2010-11-08 16:36:42.0
Response from Javier at Thorlabs to lee.jones: The transmission of these polarizers is in the order of ~95%. However, since calcite is a natural material, transmission in the UV and NIR can vary. Click on the "Calcite" tab for more information.
Poster: lee.jones
Posted Date: 2010-11-08 10:09:25.0
Can you please tell me what the transmission of this optic is at 1064 nm ? Thanks, Lee.
Poster: Adam
Posted Date: 2010-04-12 14:17:59.0
A response from Adam at Thorlabs to tslim: The damage threshold of this polarizer is 1 Watt/cm^2. It is limited by the cement interface. We can do a custom GTH10M that uses a stainless steel spacer instead of a cement interface. I will contact you direct to guage your interest in this option. Please also note that we offer Glan Laser Calcite polarizers, GL10. If you like mounting capabilities similar to the GTH10M, the GL10 can be mounted in a SM1PM10, which allows for easy adaptation to our 1" diameter high precision rotation stages, PRM1, or our standard 1" diameter rotation stage, RSP1.
Poster: tslim
Posted Date: 2010-04-09 05:51:55.0
I have a GTH10M. I wonder what is the damage threshold of this polarizer. Could you please give me the data.
Poster: technicalmarketing
Posted Date: 2008-03-04 08:21:58.0
In response to kbuffingtons post, we have added a "Mounting Option" tab that shows how to mount the GTH10M into the PRM1. It contains links to all the appropriate product pages. Thanks for your suggestion!
Poster: kbuffington
Posted Date: 2008-01-15 13:56:06.0
Include information on how to mount the GTH10M and similar mounted polarizers into a rotation mount such as PRM1. All that is needed is a lens tube of proper length. This information will be useful to many customers. Maybe also add a link to the lens tube page.
Poster: technicalmarketing
Posted Date: 2007-11-28 11:23:26.0
Dear Chihshangliu, The typical beam deviation for a Glan-Thompson polarizer is 3 arcmin, however stock polarizers can have beam deviations as great as 5 arcmin. For applications that require product specifications not listed in the presentation please consult a member of our technical support department. They can work with you to determine if we can provide a product suitable for your application.
Poster: chihshangliu
Posted Date: 2007-11-20 01:39:06.0
Hello, Id like to ask the "transmission beam deviation" of Glan-Thompson polarizer (GTH10). Because I bought several polarizers (GTH10), when I rotated(not tilted) them, I found about 1.4 mm diameter rotation at distance of 450 mm. To evalute the beam deviation is larger than 5 arcminutes. Thus, I want to know the beam deviation. Thanks Chih-Shang Liu, Associate Engineer Center for Measurement Standards/Industrial Technology Research Institute R300, CMS/ITRI Rm.302, Bldg.12, 321, Sec.2, Kuang Fu Rd. Hsinchu, Taiwan 300, R.O.C. TEL: 886-3-5743271 FAX: 886-3-5712307
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Unmounted Glan-Thompson Polarizers, Uncoated
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
GTH5 Support Documentation
GTH5 Glan-Thompson Calcite Polarizer, 5 mm x 5 mm Clear Aperture, Uncoated
$331.50
Today
GTH10 Support Documentation
GTH10 Glan-Thompson Calcite Polarizer, 10 mm x 10 mm Clear Aperture, Uncoated
$461.04
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Unmounted Glan-Thompson Polarizers, 350 - 700 nm AR Coated
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
GTH5-A Support Documentation
GTH5-A Glan-Thompson Calcite Polarizer, 5 mm x 5 mm Clear Aperture, ARC: 350 - 700 nm
$364.65
Today
GTH10-A Support Documentation
GTH10-A Glan-Thompson Calcite Polarizer, 10 mm x 10 mm Clear Aperture, ARC: 350 - 700 nm
$494.19
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Unmounted Glan-Thompson Polarizers, 650 - 1050 nm AR Coating
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
GTH5-B Support Documentation
GTH5-B Glan-Thompson Calcite Polarizer, 5 mm x 5 mm Clear Aperture, ARC: 650 -1050 nm
$364.65
Today
GTH10-B Support Documentation
GTH10-B Glan-Thompson Calcite Polarizer, 10 mm x 10 mm Clear Aperture, ARC: 650 -1050 nm
$494.19
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