CVD Zinc Selenide

OVERVIEW

Phoenix Infrared is one of a select few companies in the world producing laser grade zinc selenide using the Chemical Vapor Deposition (CVD) process. Phoenix Infrared personnel have over 30 years experience producing zinc selenide and are internationally known for producing some of the highest quality ZnSe in the world. With its low bulk absorption at 10.6 microns, zinc selenide is the optical component material of choice for high powered CO2 lasers and CO2 marking lasers. Its index of refraction homogeneity and uniformity offers excellent optical performance for use as protective windows or optical elements in high resolution forward looking infrared (FLIR) thermal imaging equipment. This material can also be used for windows and lenses in medical and industrial applications, such as thermometry and spectroscopy.

PRODUCTS

For optics producers, we offer SMTY blanks in diameters ranging from 5.5mm to 305mm and thicknesses from 1mm to 25mm. Phoenix Infrared can also offer shaped parts –generated, polished, & coated.We can provide lenses, windows, beamsplitters, prisms, wedges, and other optical components according to customer specifications and drawings. We can even offer one off specialty optics.

Chemical Properties	ZnSe
Density, (20 °C)	5.27 g/cm³
Hardness (20 °C)	105 kg/mm²
Flexural Strength (20 °C) Flexural Strength (260 °C)	750 psi 10,500 psi
Young’s Modulus (20 °C) Young’s Modulus (260 °C)	10.2 Mpsi 8.9 Mpsi
Thermal Conductivity (20 °C) Thermal Conductivity (260 °C)	0.16 W/cm-k 0.08 W/cm-k
Thermal Expansion (20-170 °C)	7.57 ppm/K
Specific Heat (20 °C)	0.339 J/g-K
Grain size	50-70 microns
Dielectric Constant (20 °C)	8.976
Loss Tangent (20 °C)	0.0017
Poisson's Ratio (20 °C)	0.28

Wavelength µm	Refractive Index
1 2 3 4 5 6 7 8 9 10 11 12 13 14	2.4892 2.4462 2.4376 2.4331 2.4295 2.4258 2.4218 2.4173 2.4122 2.4065 2.4001 2.3930 2.3850 2.3762

Optical Properties	ZnSe
Max Transmittance 1 µm Max Transmittance 10 µm	69.2% 70.9%
Absorption Coefficient 0.63 µm 2.7 µm 3.8 µm 5.3µm 10.6µm	x 10^-3cm ^-1 100 1.5 1.5 0.4 0.5
Index of inhomogeneity 10.6µm	3 ppm
Thermo-optic Coefficient (dn/dT) @293K	x 10^-5K ^-1
0.63 µm 1.15 µm 3.39 µm 10.6µm	10.6 7.0 6.2 6.1

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