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Alkor Technologies - manufacturer of CVD ZnSe optical components.
ZnSe windows catalog
ZnSe plano-convex lenses catalog
ZnSe meniscus lenses catalog
ZnSe ATR prisms
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The transmission range of Zinc Selenide ZnSe-CVD is (0.5 - 20) microns. ZnSe CVD used for high power CO2 laser optics at 10.6 microns, for protective optics windows or optical elements in FLIR (forward looking infrared) thermal imaging equipment, optics for medical and industrial applications (optical plane parallel windows (plates, disks, blanks), wedged windows, optical meniscus, spherical and cylindrical lenses, prisms, resonator mirrors of CO2 laser).
The refractive index is near 2.4. Zinc Selenide has a very low absorbtion coefficient and is used extensively for high power infrared laser optic. It is non-hygroscopic.
We produce two kinds of CVD grown ZnSe (Zinc Selenide) material:
- CVD ZnSe laser grade, grain size 50-70 microns, index of absorption 0.0005 (1/cm) at 10.6 microns, optical component dimensions 3–100 mm, thickness 20mm, used in high power CO2 laser optics, in medical applications.
- CVD ZnSe IR optical grade, grain size 20-100 microns, index of absorption 0.003 (1/cm) at 10.6 microns, optical component dimensions 3-300 mm, thickness 20mm, used in protective windows and thermal imaging equipment, in industrial applications.
ZnSe laser grade material price is higher than IR optical grade price.
Spectral transmittance (T) of ZnSe laser grade uncoated polished window (thick. 2mm), range (2.5–20) microns. For visible range T greater than or equal to 62% at 633 nm.
Spectral transmittance (T) of Zinc Selenide IR optical grade uncoated polished window (thick. 2mm), range (2.5–20) microns.
Zinc Selenide (ZnSe) - transparent in wide spectral range from yellow (visible) to far IR. ZnSe material is a chemically inert, non-hygroscopic and highly pure product that is very effective in many optical applications due to its extremely low bulk losses, high resistance to thermal shock and stability in virtually all environments, easily machined. To obtain superior transmittance, ZnSe crystals are grown by Chemical Vapor Deposition process (CVD). Zinc Selenide CVD is polycrystalline material, demonstrates superior CO2 laser transmittance and is employed in the transmission optical components used in CO2 laser processing.
ZnSe (Zinc Selenide) Chemical Vapor Deposition (CVD) material is produced by synthesis from zinc vapor and H2Se gas, forming as sheets on graphite susceptors (ZnSe-CVD processes). Chemical purity of CVD-ZnSe 99.999%. It has a polycrystalline structure; the grain size of Zinc Selenide CVD material is controlled to produce maximum strength and machinability.
| ZnSe properties |
| Chemical Formula |
ZnSe |
| Molecular Weight |
144.33 |
| Crystal Class |
Cubic, hexagonal |
| Crystal Structure |
Polycrystalline |
| Density, g/cm3 at 293 K |
5.27 |
| Melting Temperature, K |
1790 |
| Thermal Conductivity, W/(m K) at 300 K |
18 |
Thermal Expansion, 1/K
at 173 K
at 273 K
at 473 K |
5.6 x 10-6
7.1 x 10-6
8.3 x 10-6 |
| Specific Heat, cal/(g K) at 296 K |
0.081 |
| Debye Temperature, K |
246 |
| Bandgap, eV |
2.7 |
| Solubility in water at 298 K |
0.001 g/100 g H2O |
| Knoop Hardness, kg/mm2(100 g load) |
105 |
| Young's Modulus, GPa |
70 |
| Bulk Modulus, GPa |
40 |
| Poisson's Ratio |
0.28 |
| ZnSe index of refraction |
| Wavelength, µm |
2.75 |
5.00 |
7.50 |
9.50 |
11.0 |
12.5 |
13.5 |
15.0 |
16.0 |
16.9 |
17.8 |
18.6 |
19.3 |
20.0 |
| Refractive Index |
2.44 |
2.43 |
2.42 |
2.41 |
2.40 |
2.39 |
2.38 |
2.37 |
2.36 |
2.35 |
2.34 |
2.33 |
2.32 |
2.31 |
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