Zinc Selenide

Zinc Selenide is a chemically vapor deposited material commonly used in thermal imaging FLIR, and medical systems. It has wide usage in high power CO2 laser system because of its low absorption coefficient and high resistance to thermal shock. Zinc Selenids is a relatively soft material that scratches easily and it is not recommended for use in harsh environments (Knoop Hardness 120). Great care must be taken during handling, mounting, and cleaning Apply uniform pressure when handling, wear Latex finger cots or gloves to prevent contamination and do not use tweezers or other tools.


Transmission Range 0.6µm to 16µm
Density 5.27 g/cm3
Thermal Expansion 7.1 x 10-6 /°K @ 273°K, 7.8 x 10-6 /°K @ 373°K, 8.3 x 10-6 /°K @ 473°K
Surface Quality Typical specifications for surface quality in the infrared are 40-20 or 60-40 scratch-dig in the 0.8 to 7µm spectral region & 60-40, 80-50 or 120-80 scratch-dig for the 7 to 16µm area, depending upon system performance requirements. Diamond Turned surface finishes of 150 Å rms or better are typical.
Surface Accuracy In the infrared, typical required surface figures range from 1/2 wave to 2 waves @ 0.6328 µm depending on the system performance requirements.
AR Coating Options Typical available coatings for ZnSe include BBAR for 0.8 to 2.5µm, 3 to 5µm, 1 to 5µm, 8 to 12µm, & the 3 to 12µm spectral regions & single wavelength coating AR at 10.6µm. Many other specialized wavelength bands are possible within the 0.6 to 16µm range.
Typical Applications CO2 laser systems, Thermal imaging, FLIR, Astronomical, Medical
Wavelength (µm) Index of Refraction (n)
1 2.489
3 2.438
4 2.433
5 2.43
7 2.422
9 2.412
10.6 2.4028
11 2.4
13 2.385
15 2.367
17 2.344


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