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  CO2 Laser Optics & Consumable Products / Window / Brewster Windows
Brewster Windows
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Brewster Windows
Brewster Windows

Rectangular Brewster windows are uncoated substrates used in an optical system at Brewster’s Angle, the angle at which p reflectance drops to zero. This can be calculated from:

ΘB = tan-1(n)

where ΘB is Brewster’s Angle and n is the material’s index of refraction. When used in a laser cavity, a Brewster Window causes polarized laser output.

Fixed beam polarization is often required so that optical components in the system perform consistently as designed. Since many optics and coatings are polarization sensitive, a laser with a time varying polarization state can cause fluctuations in system performance.

While virtually all of the p component of polarization is transmitted by a Brewster Window, most of the s component is reflected. For ZnSe, 50% of the incident s-polarized light is reflected per surface. Ge, with a higher index of refraction, has an approximately 87% fresnel reflection of the s-polarization component at 10.6µm.

Specifications
Standards
Dimensional Tolerances
Width
Length
Thickness
+0.000”-0.005”
+0.000”-0.005”
+0.005”-0.010”
Parallelism
Plano
<= 3 arc minutes
Clear Aperture (polished)
90% of diameter
Surface Figure at 0.63µm
Width
Length
Power: 1 fringe per inch; Irregularity: fringe per inch
Power: 1 fringe per inch; Irregularity: fringe per inch
Scratch-Dig
20-10
Brewster Angle at 10.6µm
ZnSe
Ge
67.4º
76.0º
Part #
Description
Width
(inches)
Width
(mm)
Length
(inches)
Length
(mm)
Thickness
(mm)
Thickness
(mm)
746216
ZnSe
0.40
10.16
1.04
26.4
0.080
2.03
282837
ZnSe
0.50
12.7
1.30
33.0
0.080
2.03
154022
ZnSe
0.60
15.24
1.56
39.6
0.080
2.03
749878
ZnSe
0.70
17.78
1.82
46.2
0.080
2.03
768646
ZnSe
0.80
20.32
2.08
52.8
0.120
3.05
761688
ZnSe
0.90
22.86
2.34
59.4
0.120
3.05
134369
ZnSe
1.00
25.4
2.60
66.0
0.120
3.05
723434
ZnSe
1.50
38.1
3.91
99.3
0.160
4.06
260345
ZnSe
2.00
50.8
5.21
132.3
0.200
5.08
   
 
           
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