CVD Zinc Sulfide(CLEARTRAN) is the low cost alternative for infrared windows, domes and optical elements. With a fracture strength double that of Zinc Selenide(ZnSe) and high hardness, Multispectral Zinc sulfide(ZnS) has been used successfully in many military applications requiring mechanical resistance to hostile environments.
ZnS(CLEARTRAN) is a form of CVD Zinc Sulfide material that is modified by a post-deposition hot isostatic process. This process removes zinc hydrides from the crystal lattice, normalizes crystal structure and purifies the material, all contributing to single crystal-like transmittance in the visible through far infrared ranges (0.35 -14 microns).
With its low absorption and scatter throughout its broad transmitting range and high optical quality, it is particularly well-suited for multi-spectral applications that require a single aperture for beam path for several wavebands.
CVD Zinc Sulfide and CLEARTRAN are chemically inert, non-hygroscopic, highly pure, theoretically dense and easily machined. Custom diameters, rectangles, CNC-profiled blanks, generated lens blanks, prisms and near-net shape domes can be made to your specifications.
Physicochemical property：
|
|
CVD Zinc sulfide |
Multispectral CVD Zinc sulfide |
|
Density(g.cm-3@ 298k) |
4.09 |
4.09 |
|
Specific resistance(Ω.Cm) |
~1012 |
~1013 |
|
Melting point(℃) |
1827 |
1827 |
|
Chemical purity(%) |
99.9996 |
99.9996 |
|
Coefficient of thermal expansion(1/k)
|
6.6* 10-6@273k |
6.3* 10-6@273k |
|
7.3* 10-6@373k |
7.0* 10-6@373k |
|
|
Heat conductivity(J/k.m.s) |
||
|
Calorific capacity(J/g.k) |
||
|
knoop Hardness(kg/mm2) |
200-235 |
160 |
|
Bending strength(Mpa) |
103 |
|
|
Young modulus(Gpa) |
74.5 |
74.5 |
|
Poisson ratio |
0.29 |
0.28 |
Optical property：
|
|
CVD Zinc sulfide |
Multispectral CVD Zinc sulfide |
|
Wave length of transmittance scope |
1000nm---14000nm |
370nm—14000nm |
|
Inhomogeneity of refractive index（Δn/n） |
<7.3* 10-4@10600nm |
<0.2* 10-4@632.8nm |
|
Absorption coefficient(1/cm) |
0.2 @ 10600nm |
0.2 @10600nm |
|
Thermo-optical coeffecient dn/dt(1/k,298-358k) |
4.6* 10-5@1150nm |
5.43* 10-5@632.8nm |
|
4.3* 10-5@3390nm |
4.21* 10-5@1150nm |
|
|
4.1* 10-5@10600nm |
3.87* 10-5@3390nm |
Transmittance Curve:
keyword:
Multispectral ZnS
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