Zinc Selenide (ZnSe) Windows

Maximum diameter 200mm
CVD ZnSe grown in the USA
Broad wavelength range covering 600nm to 16000nm and low IR absorption
Low chromatic dispersion
Coating options: AR@3-5μm, AR@8-12μm, BBAR@3-12μm

Curves All Inquire Us

Specifications:

Materials	CVD ZnSe crystals	Diameter Range	~ 200mm
Aperture	>90%	Dimension Tolerance	+0.0/-0.2mm
Thickness Tolerance	+/-0.2mm	Surface Quality	60/40 S/D
Parallelism	1 arc minute	Chamfer	0.3-0.5mmx45degree
Coating	AR or BBAR

Physical and Optical Properties:

Transmission Range	0.6 to 16μm	Refractive Index	2.4028 @ 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 GPav	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

Zinc Selenide (ZnSe) Windows are excellent for various IR applications due to their extensive transmission wavelength range from 0.6 to 1.6μm and are often optimized for the IR range of 3-16μm after AR coating. Its absorption coefficient is in particular low in the IR range, this trait, in combination with its low chromatic dispersion, minimizes signal loss and enables authentic transmission of infrared radiation. ZnSe windows boast outstanding thermal properties, therefore are recommended for thermally demanding condition. With high thermal shock resistance and low absorption, ZnSe windows are an exceptional option for high-power CO2 lasers and thermal imaging cameras. However, the material is relatively soft and chemically sensitive and thus extra caution needs to be taken during cleaning, handling, and mounting.

Hangzhou Shalom EO offers ZnSe Windows made of CVD (Chemical Vapor Deposition) ZnSe grown in the USA with high purity. Because ZnSe also has a high refractive index (around 2.4), which normally requires an anti-reflection coating to achieve high transmission, various coating options (AR/BBAR) are provided in Shalom EO. The maximum Diameter is 200mm, while the clear aperture is greater than 90%.

Curves:

1. Transmission curve of the ZnSe windows no coating

2. Transmission curve of ZnSe windows with BBAR/BBAR coating