Miracrys

CVD ZnSe (CVD Zinc Selenide)

Zinc selenide produced by method of chemical vapour deposition is a material of choice for a variety of IR applications. ZnSe is a clear yellow polycrystalline material with a grain size of 50-70µm. ZnSe is characterized by high transmission in the range 0.5-15µm and low absorption at 10.6µm. Due to these properties combined with a relatively high thermal resistance ZnSe is the most suitable material for high power CO2 laser systems. CVD ZnSe optics are indispensable in CO2 industrial engravers and medical laser systems.

Basic properties

Optical Properties:	-
Bulk Absorption Coefficient @ 10.6 micrometers Temp. Change of Refractive Index @ 10.6micrometers Refractive Index Non-homogeneity @ 632.8nm	0.0005/cm 61x10^-6/°C <6X10^-6
Thermal Properties:	-
Thermal Conductivity Specific Heat Linear Expansion Coefficient @ 20°C	0.18W/cm/°C 0.356J/g/?C 7.57x10^-6/°C
Mechanical Properties:	-
Young\'s Modulus Rupture Modulus Knoop Hardness Density Poisson\'s Ratio	6.85X10¹¹ dyne/cm² 5.7X10⁸ dyne/cm² 110-130Kg/mm² 5.27g/cm³ 0.28
Multiply dyne/cm2x 1.45 x 10^-6 to give PSI	-

Refractive Index of CVD ZnSe:

Wave-length(μm)	Index	Wave-length(μm)	Index	Wave-length(μm)	Index	Wave-length(μm)	Index
0,54	2,68	1,8	2,45	7,4	2,42	13	2,39
0,58	2,63	2,2	2,44	7,8	2,42	13,4	2,38
0,62	2,6	2,6	2,44	8,2	2,42	13,8	2,38
0,66	2,58	3	2,44	8,6	2,41	14,2	2,37
0,7	2,56	3,4	2,44	9	2,41	14,6	2,37
0,74	2,54	3,8	2,43	9,4	2,41	15	2,37
0,78	2,53	4,2	2,43	9,8	2,41	15,4	2,36
0,82	2,52	4,6	2,43	10,2	2,41	15,8	2,36
0,86	2,51	5	2,43	10,6	2,4	16,2	2,35
0,9	2,5	5,4	2,43	11	2,4	16,6	2,35
0,94	2,5	5,8	2,43	11,4	2,4	17	2,34
0,98	2,49	6,2	2,43	11,8	2,39	17,4	2,34
1	2,49	6,6	2,42	12,2	2,39	17,8	2,33
1,4	2,46	7	2,42	12,6	2,39	18,2	2,33

Zinc Selenide Transmission Graph

Products

CVD ZnSe lenses

Material quality	Laser grade without boundaries and visible inclusions
Geometry	Meniscus, plano/convex , plano/concave, concave/concave, convex/convex
Range of Sizes	Diameter : 12.7 – 76.2 +0/-0.10 mm Edge Thickness : 2 – 5 +/-0.05 mm
Range of Effective Focal Length (EFL)	12.7-254.0 +/- 2 %
Clear Aperture (polished)	90% of diameter
Surface Figure (power-irregularity) at 0.63 microns	Plano: 1 - 0.5 fringe per inch Spherical: varies depending on radius
Surface Quality: Scratch-Dig	80/50, 60/40, 40/20 : per MIL-0-13830
AR Coating Reflectivity at 10.6 microns	0.25%

CVD ZnSe windows

Material quality	Laser grade without boundaries and visible inclusions
Range of Sizes	Diameter : 1 – 111 mm Thickness : 0.5 – 12 mm
Parallelism	Plano : <3 arc minutes
Clear Aperture (polished)	90% of diameter
Surface Figure (power-irregularity) at 0.63 microns	Plano : 1 fringe - 0.5 fringe per inch
Coating: uncoated	N/A
Coating: AR, BBAR, HR	Transmittance for 10.6 um: 99.25-0.25% (depends on the type of coating)
Surface Quality: Scratch-Dig	80/50, 60/40, 40/20 : per MIL-0-13830

CVD ZnSe blanks

Diameter/Width	12.7 – 111 mm
Thickness/Length	3 – 11 mm
Material quality	Laser grade without boundaries and visible inclusions
Surface quality	As-cut, fine-ground, polished for visual inspection
Ends/Edge Quality	As-cut, fine-ground, polished for visual inspection