crystaltechno : crystal optics manufacturer


MATERIAL	BASE PROPERTIES	REFRACTIVE INDEX	PRODUCTS AVAILABLE

Zinc Selenide (ZnSe)

Zinc Selenide is used for optical windows, lenses, mirrors and prisms particularly for infrared applications. The transmission range is 0.5 µm - 22 µm. Used for high power CO₂-laser optics at 10.6 micronsZinc Selenide is produced by synthesis from zinc vapour and H₂Se gas, forming as sheets on graphite susceptors. It 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.


MATERIAL	BASE PROPERTIES	REFRACTIVE INDEX	PRODUCTS AVAILABLE




	PARAMETER	VALUE

OPTICAL
	Transmission Range	0.6 to 21.0 microns
	Refractive Index	2.4028 at 10 microns
	Reflection Loss	31.11% at 10.6 µm (2 surfaces)
	Index of Absorption	0.0005 cm^-1 at 10.6 microns
	Restrahlen Peak	45.7 microns
	dN/dT	+61 x 10^-6/°C at 10.6µm at 298K
	dN/dµ = 0	5.5µm
PHYSICAL
	Density	5.27 g/cm³
	Melting Point	1525°C (dissociates about 700°C)
	Thermal Conductivity	18 Wm^-1K^-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^-1K^-1
	Young's Modulus (E)	67.2 GPa
	Bulk Modulus (K)	40 GPa
	Apparent Elastic Limit	55.1 MPa (8,000psi)
	Poisson Ratio	0.28

CHEMICAL
	Solubility	0.001 g/100g water
	Molecular Weight	144.33
	Class/Structure	HIP polycrystalline cubic, ZnS, F43m


MATERIAL	BASE PROPERTIES	REFRACTIVE INDEX	PRODUCTS AVAILABLE


MATERIAL	BASE PROPERTIES	REFRACTIVE INDEX	PRODUCTS AVAILABLE

Wavelength, µm	2.75	5.00	7.50	9.50	11.0	12.5	13.5
Refractive Index	2.44	2.43	2.42	2.41	2.40	2.39	2.38

Wavelength, µm	15.0	16.0	16.9	17.8	18.6	19.3	20.0
Refractive Index	2.37	2.36	2.35	2.34	2.33	2.32	2.31


MATERIAL	BASE PROPERTIES	REFRACTIVE INDEX	PRODUCTS AVAILABLE

The following products from ZnSe are available:

  WINDOWS

  BLANKS

  ATR (prisms, hemispheres)

  LENSES
   (spherical pl-cvx, spherical bi-cvx, cylindrical pl-cvx)

  PRISMS