Widest acceptance angle of all the Glan-Polarizers. | The Glan Thompson polarizer is made of two calcite prisms or a-BBO prisms cemented together. Two types of Glan Thompsons are available. One is the standard form and the other is the long form. Their length to aperture ratios are 2.5 : 1 and 3.0 : 1 respectively. Glan Thompsons tend to have higher extinction ratio than air spaced polarizers. In the ultra violet spectrum, their transmission is limited by absorption in birefriengent materials as well as the cement layer. Calcite and a-BBO polarizers polarizers can be used from about 350 to 2300 nm and 220 to 900nm respectively. |  |
These polarizers have the widest field angle of any design. The standard form of this polarizer with 2.5:1 length to aperture ratio has a full acceptance cone angle of more than 15° @ 589nm, symmetric about the input axis, whilst the long form with 3:1 ratio has a field angle >26° . The polarized field F1 and F2 of all these is shown in the plot below. Angular Field vs Wavelength:  | 
|  | Calcite:L/A=2.5 (350-2300nm) | Calcite:L/A=3.0 (350-2300nm) | a -BBO, 200-1100nm |
Specifications: |
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| Material: | a-BBO, Calcite | | Wavelength Range: | a-BBO: 200-1100 nm, Calcite: 350-2300 nm | | Extinction Ratio: | Calcite: <5x10-5 ; a-BBO: <5x10-6 | | Parallelism: | <1 arc minutes | | Surface Quality: | 20-10 | | Beam Deviation: | < 3 arc minutes | | Wavefornt Distortion: | λ /4 @ 633 nm | | Damage Threshold: | >200 MW/cm2 | | Coating: | Single MgF2 | | Mount: | Black Anodized Aluminium |
Standard Products 1. a-BBO Glan Thompson Polarizer (Special for DUV, Visible and NIR (200-1100 nm) | Part No. | L/CA | Extinction Ratio | Angular Field(°) | C.A. φ a (mm) | O.D. φ d (mm) | L±0.1(mm) |
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| 50.230.00001 | 1.6 | <5x10-6 | >15 | 6.0 | 15.0 | 18.0 | | 50.230.00008 | 8.0 | 25.4 | 21.0 | | 50.230.00009 | 10.0 | 25.4 | 24.5 | | 50.230.00010 | 15.0 | 30.0 | 32.5 | | 50.230.00011 | 20.0 | 38.0 | 40.7 |
2. Calcite Glan Thompson Polarizer | Part No. | L/CA | Extinction Ratio | Angular Field(°) | C.A. φ a (mm) | O.D. φ d (mm) | L±0.1(mm) |
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| 50.230.00057 | 2.5 | <5x10-5 | 14-16 | 6.0 | 15.0 | 23.0 | | 50.230.00098 | 8.0 | 25.4 | 28.0 | | 50.230.00099 | 10.0 | 25.4 | 33.0 | | 50.230.00101 | 15.0 | 30.0 | 45.5 | | 50.230.00102 | 3.0 | <5x10-5 | 25-28 | 6.0 | 15.0 | 36.0 | | 50.230.00103 | 8.0 | 25.4 | 32.0 | | 50.230.00104 | 10.0 | 25.4 | 38.0 | | 50.230.00106 | 15.0 | 30.0 | 53.0 |
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Optics 
