Glan Thompson Polarizer

Optics >>> Polarizer >>> Glan Thompson Polarizer

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 2300nm respectively.

This polarizer has 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, whereas 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 versus Wavelength:
 

Calcite: L/A=2.5 (350-2300nm)

Calcite: L/A=3.0 (350-2300nm)


a-BBO, 220-900nm

 
 
Main Specifications
Material a-BBO, Calcite
Wavelength Range a-BBO: 220-900 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
Wavefront Distortion l/4@633nm
Damage Threshold >200 MW/cm2
Coating Single MgF2
Mount Black Anodized Aluminum

Standard Products:
 
1. a-BBO Glan Thompson Polarizer(Special for DUV, Visible and NIR(200-1100nm) 
Part No.
L/CA
Extinction Ratio
Angular Field()
C.A. 
fa (mm)
O.D. 
fd (mm)
L0.1
(mm)
GMP-6006
1.6
<5x10-6
>15
6.0
15.0
18.0
GMP-6008
8.0
25.4
21.0
GMP-6010
10.0
25.4
24.5
GMP-6015
15.0
30.0
32.5
GMP-6020
20.0
38.0
40.7

     
2. Calcite Glan Thompson Polarizer 
Part No.
L/CA
Extinction Ratio
Angular Field()
C.A. 
f
a (mm)
O.D. 
fd (mm)
L0.1
(mm)
GMP-7106
2.5
<5x10-6
14-16
6.0
15.0
23.0
GMP-7108
8.0
25.4
28.0
GMP-7110
10.0
25.4
33.0
GMP-7115
15.0
30.0
45.5
GMP-7206
3.0
<5x10-6
25-28
6.0
15.0
26.0
GMP-7208
8.0
25.4
32.0
GMP-7210
10.0
25.4
38.0
GMP-7215
15.0
30.0
53.0

 

    

Toll Free(U.S.) 888.309.5061 Fax 650.618.2057
   

Copyright 2010 Red Optronics.  All Rights Reserved.