取扱商品紹介

Ge crystal

  • 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

Germanium
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

Germanium
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.

Specification

Monocrystalline and polycrystalline cylinder blanks
Largest Diamester(mm) 300(mono-crystalline)
380(polycrystalline)     
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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