Селенид цинка ZnSe

Optics-M produces lenses, windows, prisms, wedges, ball lenses, cylindrical lenses and others optical components according to customers’ specifications and drawings out of crystals zinc selenide ZnSe CVD.

ZnSe is used widely for IR components, windows and lenses, and for spectroscopic ATR prisms. Zinc Selenide is one of the materials of choice for CO2 laser optics operating at 10.6 microns.

Zinc Selenide is produced by synthesis from Zinc vapour and H2Se gas, forming as sheets on Graphite susceptors. Zinc Selenide is microcrystalline in structure, the grain size being controlled to produce maximum strength. Single crystal ZnSe is available, but is not common but has been reported as having lower absorption and thus more effective for CO2 optics.

Zinc Selenide oxidizes significantly at 300°C, exhibits plastic deformation at about 500°C and dissociates about 700°C. For safety, Zinc Selenide windows should not be used above 250°C in normal atmosphere.

Product Data

Transmission Range 0.6 to 21.0 μm
Refractive Index 2.4028 at 10.6 μm
Reflection Loss 29.1% at 10.6 μm (2 surfaces)
Absorption Coefficient 0.0005 cm-1 at 10.6 μm
Reststrahlen Peak 45.7 μm
dn/dT +61 x 10-6/°C at 10.6 μm at 298K
dn/dμ 0: 5.5 μm
Density 5.27 g/cc
Melting Point 1525°C (see notes below)
Thermal Conductivity 18 W m-1 K-1 at 298K
Thermal Expansion 7.1 x 10-6 /°C at 273K
Hardness Knoop 120 with 50g indenter
Specific Heat Capacity 339 J Kg-1 K-1
Dielectric Constant n/a
Youngs Modulus (E) 67.2 GPa
Shear Modulus (G) n/a
Bulk Modulus (K) 40 GPa
Elastic Coefficients Not Available
Apparent Elastic Limit 55.1 MPa (8000 psi)
Poisson Ratio 0.28
Solubility 0.001g/100g water
Molecular Weight 144.33
Class/Structure HIP polycrystalline cubic, ZnS, F43m

Transmittance

Refractive Index

No = Ordinary Ray

µm No µm No µm No
0.54 2.6754 0.58 2.6312 0.62 2.5994
0.66 2.5755 0.7 2.5568 0.74 2.5418
0.78 2.5295 0.82 2.5193 0.86 2.5107
0.90 2.5034 0.94 2.4971 0.98 2.4916
1.0 2.4892 1.4 2.4609 1.8 2.4496
2.2 2.4437 2.6 2.4401 3.0 2.4376
3.4 2.4356 3.8 2.4339 4.2 2.4324
4.6 2.4309 5.0 2.4295 5.4 2.4281
5.8 2.4266 6.2 2.4251 6.6 2.4235
7.0 2.4218 7.4 2.4201 7.8 2.4183
8.2 2.4163 8.6 2.4143 9.0 2.4122
9.4 2.4100 9.8 2.4077 10.2 2.4053
10.6 2.4028 11.0 2.4001 11.4 2.3974
11.8 2.3945 12.2 2.3915 12.6 2.3883
13.0 2.3850 13.4 2.3816 13.8 2.3781
14.2 2.3744 14.6 2.3705 15.0 2.3665
15.4 2.3623 15.8 2.3579 16.2 2.3534
16.6 2.3487 17.0 2.3438 17.4 2.3387
17.8 2.3333 18.2 2.3278