Polarizer

Glan Thompson Polarizers

Glan Thompson Polarizers

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. a -BBO polarizers and Calcite polarizers can be used from about 220 to 900nm and 350 to 2300 nm respectively.
 

 


The 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, 220-900nm

Specifications:

Material: a -BBO, Calcite
Wavelength Range: a -BBO: 220-1100 nm, Calcite: 350-2300 nm
Extinction Ratio: Calcite:<5x10 -5 ; a -BBO:<5x10 -6
Parallelism: <1 arc Min
Surface Quality: 20-10
Beam Deviation: < 3 arc minutes
Flatness: l/4@633nm
Damage Threshold: >200 MW/cm 2
Coating: Single MgF2
Mount: Black Anodized Aluminium
   

Standard Products

1. a -BBO Glan Thompson Polarizer(Special for DUV, Visible and NIR(200-1100nm)

Foctek's Patent Prodaet, Patent #ZL 2005 1 0018753.6

Part No. L/CA Extinction Ratio Angular Field(°) C.A. Φ a (mm) O.D. Φ d (mm) L±0.1(mm) Unit Price
GMP6006 1.6 <5x10 -6 >15° 5 15 14 $299.00
GMP6008 7 25.4 17 $359.00
GMP6010 9 25.4 21 $479.00
GMP6012 11.4 25.4 26 $599.00
GMP6015 13.5 30 31 $749.00
GMP6020 18 38 40 $989.00
Note: "RFQ" stands for "Request For Quoting".

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) Unit Price
GMP7106 2.5 <5x10 -6 14°-16° 5 15 18 $229.00
GMP7108 7 25.4 23 $259.00
GMP7110 9 25.4 28 $315.00
GMP7112 11.4 25.4 35 $389.00
GMP7115 13.5 30 41 $426.00
GMP7206 3 <5x10 -6 25°-28° 5 15 21 $289.00
GMP7208 7 25.4 27 $329.00
GMP7210 9 25.4 33 $399.00
GMP7212 11.4 25.4 41 $469.00
GMP7215 13.5 30 48 $569.00
Note: Price list is for quantity <=5 pcs .

A wide variety of custom design Glan Thompson Polarizer are available upon request
Custom Size Mount is available upon request
AR coated Polarizer is available upon request

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