China Zinc Selenide CVD Znse Material Optical Material

ZnSe is used widely for IR components, windows and lenses, and for spectroscopic ATR prisms. Zinc Selenide is one of the materials of choice for CO2 laser optics operating at 10.6 microns.

Product Data ----------------------------------------------------- Transmission Range :0.6 to 21.0 μmRefractive Index :2.4028 at 10.6 μmReflection Loss :29.1% at 10.6 μm (2 surfaces)Absorption Coefficient :0.0005 cm-1 at 10.6 μmReststrahlen Peak :45.7 μmdn/dT :+61 x 10-6/°C at 10.6 μm at 298Kdn/dμ = 0 :5.5 μmDensity :5.27 g/ccMelting Point :1525°C (see notes below)Thermal Conductivity :18 W m-1 K-1 at 298KThermal Expansion :7.1 x 10-6 /°C at 273KHardness :Knoop 120 with 50g indenterSpecific Heat Capacity :339 J Kg-1 K-1Dielectric Constant :n/aYoungs Modulus (E) :67.2 GPaShear Modulus (G) :n/aBulk Modulus (K) :40 GPaElastic Coefficients :Not AvailableApparent Elastic Limit :55.1 MPa (8000 psi)Poisson Ratio :0.28Solubility :0.001g/100g waterMolecular Weight :144.33Class/Structure :HIP polycrystalline cubic, ZnS, F43mRefractive Index and Optical Transmittance curve---- Refractive Index(No=Ordinary Ray): µmNoµmNoµmNo0.542.67540.582.63120.622.59940.662.57550.72.55680.742.54180.782.52950.822.51930.862.51070.902.50340.942.49710.982.49161.02.48921.42.46091.82.44962.22.44372.62.44013.02.43763.42.43563.82.43394.22.43244.62.43095.02.42955.42.42815.82.42666.22.42516.62.42357.02.42187.42.42017.82.41838.22.41638.62.41439.02.41229.42.41009.82.407710.22.405310.62.402811.02.400111.42.397411.82.394512.22.391512.62.388313.02.385013.42.381613.82.378114.22.374414.62.370515.02.366515.42.362315.82.357916.22.353416.62.348717.02.343817.42.338717.82.333318.22.3278 Optical Transmittance Curve of ZnSe (Reference Data):Special properties of ZnSe-----------------------------------

Its high resistance to thermal shock makes it the prime material for high power CO2 laser systems.

ZnSe is only 2/3 the hardness of ZnS multispecral grade, but the harder antireflectance coatings serve to protect ZnSe.

ZnSe's cost is about the same as ZnS multispectral grade.

Generally more expensive than Ge.

ZnSe is diamond turnable.

Typeical application:Thermal imaging, FLIR.
Products manufactured:Lenses, Aspheric Lenses, Binary (diffractive) Lenses, Windows, Optical Beamsplitters and Optical Filters, Prism.
Surface finish:Typical specifications for surface quality in the infrared are 40-20 or 60-40 scratch dig in the 0.8 to 7μm spectral region and 60-40, 80-50 or 120-80 scratch-dig for the 7 to 16μm area, depending upon system performance requirements. Diamond Turned surface finishes of 150 Angstroms rms or better are typical.
Surface figure:In the infrared, typical required surface figures range from 1/2 wave to 2 waves @0.6328 μm depending on the system performance requirements.
AR coating options:Typical available coatings for ZnSe include BBAR for 0.8 to 2.5μm, 3 to 5μm, 1 to 5μm, 8 to 12μm, and the 3 to 12μm spectral regions and single wavelength coating AR at 10.6μm. Many other specialized wavelength bands are possible within the 0.6 to 16μm range.

Product Notes:------------ --------------------------------------

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.
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.
Data provided is extracted from our technical handbook of materials. While every attempt has been made to verify the source of the information, ultiQuest Technology accept no responsibility for accuracy of data