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Home > Products > Windows > ZnSe Windows

Zinc Selenide (ZnSe) Crystals Windows

●   High transmission at 3-12um

●   Low dispersion and low absorption 

●   Ideal for thermally demanding environments


Zinc Selenide (ZnSe) windows is an excellent choice for any IR applications due to its broad wavelength range (3 µm to 16 µm). Zinc selienide is a chemically vapor diposited material commonly used in thermal imaging and medical systems. Zinc selenide (ZnSe) windows has a high index of refraction which normally requires an anti-reflection coating to achieve high transmission. Zinc selenide is relatively soft with low scratch resistance thus not recommended for use in harsh enviornment. Extra caution is required during cleaning, handling, and mounting.

Specifications of ZnSe windows:

Transmission curve of ZnSe window:

(AR/AR, @7-14um)

Material:

CVD ZnSe crystals

Dimension Range:

Dia. 3mm to 200mm, 3x3mm to 200x200mm

Dimension Tolerance:

+/-0.05mm, +0/-0.1mm

Thickness Range:

>1mm

Thickness Tolerance:

+/-0.05mm

Surface Quality:

60-40, 80-50 (MIL13830)

Surface Accuracy:

up to 1/4 lambda per 25@633nm

Parallelism:

1 arc min

Chamfer:

protective, 0.2 to 0.5x45 Degree

Coating:

avaliable upon request

Proterties of ZnSe crystal:
Physical and optical proterties

Transimission Range0.6 to 21.0um
Refractive Index2.4028 @ 1.06um
Reflection Loss29.1% @ 1.06um
Absorption Coefficient0.5 x 10-3cm-1 @10.6um
Reststrahlen Peak45.7um
dn/dT+61x10-6 @ 10.6um 298K
dn/du = 05.5 um
Density5.27 g/cc
Melting Point1525°C
Thermal Conductivity18 W m-1 K-1 @ 298K
Thermal Expansion7.1 x 10-6 /°C @ 273K
HardnessKnoop 120 with 50g indenter
Specific Heat Capacity339 J Kg-1 K-1
Dielectric Constantn/a
Youngs Modulus (E)67.2 GPa
Shear Modulus (G)n/a
Bulk Modulus (K)40 GPa
Elastic Coefficientsn/a
Apparent Elastic Limit55.1MPa （48000 psi)
Poisson Ratio0.28
Solubility0.001g/100g water
Molecular Weight144.33
Class/StructureHIP polycrystalline cubic, ZnS, F43m

Typical applications:

  • CO2 laser optics
  • Medical systems
  • Thermal Imaging
  • FLIR
  • UV and IR Windows and Lenses
  • Detector and Pressure Cells
  • Photodiodes
  • Bar Code Readers