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ZnSe/Ge Brewster Window
Brewster window is uncoated substrate used in an optical system at Brewster Angle. It is used to separate the S polarization from the P polarization.
Specifications
Diameter Tolerance: +0.0, -0.13 mm
Thickness Tolerance: ±0.25mm
Clear Aperture: >80%
Parallelism: <3 arc min
Surface Quality: 40-20 scratch and dig
Flatness λ /4 per 1”Dia @632.8nm
| Part No. | Material | Diameter (inch/mm) | Thickness (inch/mm) |
|---|---|---|---|
| WBG-0.5*2-2 | Ge | 0.5*2.0 | 2.0 |
| WBG-0.6*2.5-2 | Ge | 0.6*2.5 | 2.0 |
| WBG-0.7*2.9-2 | Ge | 0.7*2.9 | 2.0 |
| WBG-1.0*4.1-3 | Ge | 1.0*4.1 | 3.0 |
| WBG-1.5*3.9-4 | Ge | 1.5*3.9 | 4.0 |
| WBG-2.0*5.2-5 | Ge | 2.0*5.2 | 5.0 |
| WZB-26.4*10.2-2 | ZnSe | 26.4*10.2(mm) | 2.0 |
| WZB-0.7*1.8-2 | ZnSe | 0.7*1.8 | 2.0 |
| WZB-0.6*1.5-2 | ZnSe | 0.6*1.5 | 2.0 |
| WZB-0.5*1.3-2C(Corner cut) | ZnSe | 0.5*1.3 | 2.0 |
| WZB-0.5*1.3-2 | ZnSe | 0.5*1.3 | 2.0 |
| WZB-25*66-3 | ZnSe | 25*66(mm) | 3.0 |
| WZB-25*50-3 | ZnSe | 25*50(mm) | 3.0 |
| WZB-20.3*52.8-3 | ZnSe | 20.3*52.8(mm) | 3.0 |
| WZB-1.0*2.6-3 | ZnSe | 1.0*2.6 | 3.0 |
| WZB-53*20-3 | ZnSe | 53*20(mm) | 3.0 |
| WZB-1.5*3.9-4 | ZnSe | 1.5*3.9 | 4.0 |
| WZB-2.0*5.2-5 | ZnSe | 2.0*5.2 | 5.0 |
| WZB-30*75-5 | ZnSe | 30*75(mm) | 5.0 |
The angle which p reflectance drops to zero, termed brewster's angle, can be calculated from:
θb=tan-1(n)
- Whereθbis Brewster's Angle and n is the material's index of refraction.
- ZnSe, brewster angle 67.4 degree
- GaAs, brewster angle 73 degree
- Ge, brewster angle 76 degree