The detector window has to fulfill two functins:
Define the spectral sensitiveness of the pyroelectric chip according to the purpose of the application from UV to Far IR
Reliable hermetic seal of the optical interface between detector and environment
Laser Optex provide crystal window & filter with the following versions:
Standard single crystal windows
Standard narrow band pass filters (NBP)
Custom-designed filters or filters
The catalog of window & filter for pyroelectric detectors
|
Window / Filter Description |
Band Pass Wavelength |
Typical peak Transmission |
Typical Average Transmission |
Standard thickness |
|
Sapphire |
0.3 - 7.0 μm |
90% |
85% |
0.5 mm |
|
Polycrystalline Spinel? |
0.3 - 6.0 μm |
85% |
85% |
0.5 mm |
|
Polycrystalline MgF2 |
0. 7 - 9.0 μm |
85% |
85% |
0.6 mm |
|
BaF2 (Barium Fluoride) |
0. 2 -17.5μ m |
91% |
91% |
0.6 mm |
|
CaF2 (Calcium Fluoride) |
0.2-12.5 μm |
90% |
90% |
0.4 mm |
|
UV Quartz glass |
0.15 - 2.6 μm 2.75 - 4.8 μ m |
85% |
70% |
0.5 mm |
|
ZnSe (Zinc Selenide) |
0. 58 - 22μ m |
70% |
68% |
1.0 mm |
|
ZnS? (Zinc Sulfide) |
1.0 -15 μm |
75% |
68% |
1.0 mm |
|
KBr (Potassium Bromide, protected) |
0.2 - 30 μm |
90% |
90% |
0.8 mm |
|
CsI (Cesium iodide, protected) |
0.3 - 50μ m |
80% |
80% |
0.8 mm |
|
Uncoated Ge |
1.8 - 30μ m |
45% |
45% |
1.0 mm |
|
8-14 | M Ge (DLC protected) |
8 -14 μm |
92% |
75% |
1.0 mm |
|
8-14 | M ZnSe (DLC protected) |
8 -14 μm |
95% |
90% |
1.0 mm |
|
3-12 | M ZnSe |
3 -12 μm |
92% |
90% |
1.0 mm |
|
5-20 | M ZnSe |
5 -20 μm |
90% |
80% |
1.0 mm |