• For the windows and lenses of IR filter, CO2 Laser and infrared imaging systems
  • Maximum Diameter: Ø300mm for single crystal; 380mm for polycrystal
  • Various shape: rod, disc, rectangle, lenses, etc

Product Properties

Refractive Index(@10μm) 4.0026
Homogeneity of Refractive Index ≦1.0×10-4 (Φ250mm)
Bulk Absorption Coefficient(@10μm,cm-1) ≦0.03
Rupture Modulus(Mpa) ≧75

Technical Index

Transparent region (μm) 1.8—23
Hardness (kg/mm2 ) 800
Density(g/cm3) 5.33
Yonug’s Modulus(Gpa) 103
Thermal Conductivity(Wcm-1k-1) 59
Thermal Expansion Coefficient(/℃) 6.1×10-6
Posson ratio 0.28
Melting point(/℃) 937
Specific heat (Cal/g.k.) 0.074
Dielectric constant 16
Resistivity (Ωcm) 0.01–50

the listed index are from reference book, may be different from our products, more special requirements should be discussed individually.


Monocrystalline and polycrystalline cylinder blanks
Largest Diamester(mm) 300(mono-crystalline)
Tolerance on diameter standard 0.1mm; limit 0.03mm
Thickness minimum 0.8mm,maximum: depends on the diameter,
Example for Φ25mm,max length 600mm;
Φ200mm,max.length 200mm
Tolerance on thickness Standard:0.1mm,limit:0.05mm(thickness ≦40mm)
Monocrystalline and polycrystalline rectangular blanks
Maximum dimensions 200*200mm
Tolerance on these dimensions 0.1mm
Minimum thickness depend on the dimensions,example for diagonal≦150mm,thickness≧2mm;
Tolerance on thickness standard 0.1mm(thickness≦100mm)
Spherical generated lens
Diameter from 15 to 200mm
Tolerance on diameter standard 0.1mm; limit 0.03mm
Tolerance on curvatures standard0.5%; limit 0.05%
Tolerance on center thickness standard0.1mm; limit 0.05mm
Special shapes
Monocrystalline and polycrystalline prisms
Monocrystalline and polycrystalline tapers

This table just show the general specification of our products, more special requirements could be discussed individually.



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