Continental Trade Sp. z o. o.

Technical glass

Zinc Selenide (ZnSe)

Zinc Selenide (ZnSe) optical elements for infrared applications.

Zinc Selenide (ZnSe) is a popular material in infrared applications. Very wide transmission spectrum, covering the range from 0.6 μm to 22 μm and the high quality of material obtained by CVD (Chemical Vapor Deposition), make it usefull for the production of optical elements (windows, lenses, mirrors) for infrared applications (thermal imaging, FLIR, medical systems, high power IR lasers). Zinc Selenide is produced by synthesis from Zinc vapour and H2Se gas, forming as sheets on Graphite susceptors. Zinc Selenide is microcrystalline in structure, the grain size being controlled to produce maximum strength. Single crystal ZnSe is available, but is not common but has been reported as having lower absorption and thus more effective for CO2 optics. 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 oxidizes significantly at 300°C, exhibits plastic deformation at about 500°C and dissociates about 700°C. For safety, Zinc Selenide windows should not be used above 250°C in normal atmosphere. 

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.

Note: Special care should be taken when handling Zinc Selenide as it is a toxic material. Always wear rubber or plastic gloves to avoid risk of contamination.

Main properties

Parameter Value
Transmission Range : 0.6 to 21.0 μm
Refractive Index : 2.4028 at 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 GPa
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

Refractive index 

µm No µm No µm No
0.54 2.6754 0.58 2.6312 0.62 2.5994
0.66 2.5755 0.7 2.5568 0.74 2.5418
0.78 2.5295 0.82 2.5193 0.86 2.5107
0.90 2.5034 0.94 2.4971 0.98 2.4916
1.0 2.4892 1.4 2.4609 1.8 2.4496
2.2 2.4437 2.6 2.4401 3.0 2.4376
3.4 2.4356 3.8 2.4339 4.2 2.4324
4.6 2.4309 5.0 2.4295 5.4 2.4281
5.8 2.4266 6.2 2.4251 6.6 2.4235
7.0 2.4218 7.4 2.4201 7.8 2.4183
8.2 2.4163 8.6 2.4143 9.0 2.4122
9.4 2.4100 9.8 2.4077 10.2 2.4053
10.6 2.4028 11.0 2.4001 11.4 2.3974
11.8 2.3945 12.2 2.3915 12.6 2.3883
13.0 2.3850 13.4 2.3816 13.8 2.3781
14.2 2.3744 14.6 2.3705 15.0 2.3665
15.4 2.3623 15.8 2.3579 16.2 2.3534
16.6 2.3487 17.0 2.3438 17.4 2.3387
17.8 2.3333 18.2 2.3278    

While every attempt has been made to verify the source of the information, no responsibility is accepted for accuracy of data.

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