Zinc Selenide

Zinc selenide (CVD zinc selenide®) is the preferred material for optical components in high energy density CO2 lasers due to its extremely low absorption at 10.6 µm. Its high refractive index homogeneity and excellent optical quality allow it to be used in high-resolution FLIR thermal imaging cameras as well as in laboratory applications such as thermography and spectroscopy.

Resistant materials for VIS and IR applications

Vickers Hardness

112

[kg mm-2]

to operate in harsh enviroments

Chemical purity

99.9996

%

more homogeneous crystal structure

Transmission

0.5 – 22

µm

multispectral  in VIS and IR

Its homogeneity and uniformity of refractive index provide excellent optical properties for use as protective windows or optical elements in high-resolution, advanced (FLIR) thermal imaging devices. This material is also used for small windows and lenses in medical and industrial applications such as thermometry and spectroscopy. Zinc selenide (CVD zinc selenide®) is chemically inert, non-hygroscopic, highly pure, theoretically dense and easy to process. It has extremely low absorption and scattering losses, is resistant to high temperatures and is stable in almost all environments.

Special diameters, rectangles, CNC-profiled blanks, generated lens blanks, prisms and near-net-shape domes can be manufactured according to your specifications.

Properties of our zinc selenide (CVD Zinc Selenide®)

Zinc selenide
Optical properties
10 % transmission limit (t = 6mm)0.5 µm – 22 µm
Refractive index inhomogeneity (∆n/n)< 3 ppm @ 633 nm
Thermo-optical coefficient dn/dT (298-358 K)
K-1 @ 0.6328 µm
K-1 @ 1.15 µm
K-1 @ 3.39 µm
K-1 @ 10.6 µm

1.7 x 10-4
7.0 x 10-5
6.2 x 10-5
6.1 x 10-5
Absorption coefficient
cm-1 @ 1 .3 µm
cm-1 @ 2.7 µm
cm-1 @ 3.8 µm
cm-1 @ 9.27 µm
cm-1 @ 10.6 µm

5.0 x 10-3
7.0 x 10-4
4.0 x 10-4
4.0 x 10-4
5.0 x 10-4
Thermal properties
Coefficient of thermal expansion
[K-1] @ 273 K
[K-1] @ 373 K
[K-1] @ 473 K

7.1 x 10-6
7.8 x 10-6
8.3 x 10-6
Thermal conductivity
[JK-1m-1s-1] @ 298 K

18.0
Heat capacity
[Jg-1K-1] @ 298K

0.339
Pulse laser damage
@ 10.6 µm, pulse width 15 µs, 1 pulse
Angle of incidenceFluence [Jcm-2]Plasma on the surfaceSurface damage
Normal20noNo damage
Normal25YesFailure
Brewster angle15noNo damage
Brewster angle20noDamage to the rear
Mechanical properties
Knoop hardness:
50 g load [kg mm-2]
Vickers hardness:
1 kg load [kg mm-2]

110

112
Flexural strength (modulus of rupture)
4pt. Load [psi]
4pt. Load [MPa]

8 x 103
55
Fracture toughness
(critical stress intensity factor, KIC-values)
[MPa √m, Vickers, 100 g]


0.5
Modulus of elasticity
[psi]
[GPa]

9.75 x 106
67.2
Poisson’s ratio0.28
Physical properties
Crystal structurecubic
Grain size [µm]50 – 70
Density [g cm-3] @ 298 K5.27
Specific resistance [Ω cm]~1012
Chemical purity [%]99.9996
Refractive indices [@ 20 ºC]
Wavelength [µm] n
0.542.6754
0.622.5994
1.002.4892
3.002.24367
5.002.4295
7.002.4281
9.002.4122
11.002.4001
13.002.3850
15.002.3665
17.002.3438

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