Introduction: Germanium has the highest index of refraction of any commonly used infrared transmitting materials. Germanium(Ge) based optical components are widely used for IR applications. Its blocks UV and visible light and in the infrared up to about 2µm. Ge based optical components include mirrors, windows and lenses etc.
Main Application：IR optics, night vision, laser application, X-rays etc.
CASTECH process Ge Lens, windows and mirrors with：
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Diameter
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+0.0/-0.10mm
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Length
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+/-0.2mm
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Chamfer
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0.20+/-0.10mm @ 45°
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Surface Figure (power/irregularity) at 0.63µm
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1.0 fringe/0.5 fringe
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Parallelism
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< 40 arc Seconds
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Perpendicularity
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< 5 arc min
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Surface Quality
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40/20Scratch/Dig
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Tighter specifications are available upon customer's requirements.
Main Properties of Ge Materials：
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Crystal Type
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Cubic
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Lattice Parameter
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a=5.657Å
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Transmission Band
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2-12 um
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Mohs Hardness
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6.3
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Density
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5.33g/cm3
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Melting Point
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937 ℃
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Refractive Index
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4.0032 at 10.6um
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Resistivity
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5-40 ohm-cm
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Young’s Modulus
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103 GPa
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Thermal Expansion
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6.1 x10-6/℃
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Thermal Conductivity
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167mcal /cm/s/k
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Refractive Index
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Wavelength, µm
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2.06
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2.15
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2.44
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2.58
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3.00
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3.42
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4.36
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6.24
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8.66
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9.72
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11.04
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13.02
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Refractive Index
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4.10
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4.09
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4.07
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4.06
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4.05
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4.03
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4.02
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4.01
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4.00
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4.00
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4.00
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4.00
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