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Zinc Selenide |
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- Most commonly used crystalline material for transmissive optics in the IR region.
- ZnSe partially transmits the visible allowing visible laser diodes and He-Ne lasers to be used for optical alignment.
- A synthetic optical grade crystalline material manufactured by chemical vapor deposition (CVD).
- Though ZnSe has an extremely high internal transmittance, due to its high refractive index, the surface reflection loss of almost 17% per surface keeps the total transmittance low.
- Reacts with acids to generate poisonous selenium oxide gas.
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| Optical property |
| Crystal Class |
Cubic,Hexagonal |
| Crystal Structure |
Polycrystalline |
| Density at 20°C ,g/cm3 |
5.27 |
Thermal Conductivity W/(mk)at 300K
|
18 |
Thermal Expansion 1K
at 173 K
at 273
at 473
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5.6X 10-6
7.1X 10-6
8.3X 10-6 |
| Melting Point,K |
1790 |
Specific Heat,cal/(gK)at 296K
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0.081 |
| Knoop Hardness,kg/mm2 (100g load) |
105 |
| Young's Modulus,GPa |
70 |
| Bluk Modulus,GPa at 273K |
40 |
| Poisson's Ratio |
0.28 |
| Bandgap,eV |
2.7 |
| Water Solubility at 298 K |
0.001g/100g H2O |
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Transmittance Property (Reference Data)
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Refractive Index |
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Wevelength (µm) |
n |
0.58 |
2.631 |
0.66 |
2.576 |
1.0 |
2.489 |
2.2 |
2.444 |
4.2 |
2.432 |
6.2 |
2.425 |
8.2 |
2.416 |
16.2 |
2.353 |
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ZnSe window (drilled) |
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Material |
Zinc Selenide |
General |
Precise |
| Dimension Tolerance |
+/-0.1mm |
+/-0.05mm |
| Claer Aperture |
80% |
90% |
| Surface Faltness |
1/4L@
633nm |
1/8L@633nm |
| Surface Quality |
40-20 |
10-5 |
| Drill Hole Tolerance |
+/-0.02 |
+-/0.02 |
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ZnSe Rectangular Prism |
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Material |
Zinc Selenide |
General |
Precise |
| Dimension Tolerance |
+/-0.1mm |
+/-0.05mm |
| Claer Aperture |
80% |
90% |
| Surface Faltness |
1/4L@
633nm |
1/8L@633nm |
| Surface Quality |
40-20 |
10-5 |
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ZnSe Wedge Prism |
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Material |
Zinc Selenide |
General |
Precise |
| Dimension Tolerance |
+/-0.1mm |
+/-0.05mm |
| Claer Aperture |
80% |
90% |
| Surface Faltness |
1/4L@
633nm |
1/8L@633nm |
| Surface Quality |
40-20 |
10-5 |
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ZnSe Window |
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Material |
Zinc Selenide |
General |
Precise |
| Dimension Tolerance |
+/-0.1mm |
+/-0.05mm |
| Claer Aperture |
80% |
90% |
| Surface Faltness |
1/4L@
633nm |
1/8L@633nm |
| Surface Quality |
40-20 |
10-5 |
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ZnSe Plano Concave Lens |
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Material |
Zinc Selenide |
General |
Precise |
| Dimension Tolerance |
+/-0.1mm |
+/-0.05mm |
| Claer Aperture |
80% |
90% |
| Surface Faltness |
1/4L@
633nm |
1/8L@633nm |
| Surface Quality |
40-20 |
10-5 |
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