ZnSe Window

Zinc Selenide (ZnSe) Windows are ideal for a wide variety of infrared applications including thermal imaging, FLIR, and medical systems. This chemically vapor deposited material has wide usage in high power CO2 laser systems because of its low absorption coefficient and high resistance to thermal shock. Zinc Selenide (ZnSe) is a relatively soft material that scratches easily and it is not recommended in harsh environments because its Knoop Hardness is only 120. When handling, apply uniform pressure and wear Latex finger cots or gloves to prevent contamination.


1 ) Low Dispersion

2 ) Available Uncoated or AR Coated

3 ) Ideal for Thermal Imaging, FLIR, and Medical Systems


1 ) Diameter: 3~200mm

2 ) Diameter Tolerance: +/-0.2mm

3 ) Thickness Tolerance: +/-0.03mm

4 ) Aperture: >90%

5 ) Surface Quality: 60/40~10/5 (S/D)

6 ) Parallelism: <1 arc minute

7 ) Chamfer: 0.3-0.5mmx45°

8 ) Coating: AR/AR

Optical Properties

Transmission Range

0.6 to 21 micron

Refractive Index

2.4028 at 10.6 micron

Refractive Loss

29.1% at 10.6 micron

Crystal/Class Structure

Cubic, ZnS, F43m

Thermal Properties

Thermal Expansion

7.1×10-6 /℃ at 273K

Thermal Conductivity

18 W m-1K-1 at 298K

Melting Point

1525 ℃

Specific Heat Capacity

339 J Kg-1K-1

Mechanical Properties


5.27 g/cc


120 Knoop with 50g indenter

Youngs Modulus

67.2 GPa

Bulk Modulus

40 GPa

Poisson Ratio


Elastic Limit

55.1 MPa(8000psi)

Molecular Weight


Chemical Properties


0.001g/100g water

Technical Images