UQG Optics

GERMANIUM (GE)
MATERIAL: Germanium – Optical Grade - Monocrystalline
SPECTRAL DATA: Transmission ≥ 46% @ 3-10 microns
Polished 10mm thick sample
Typical transmission curve of 1mm thick Germanium (mono-crystalline)
Physical electronic properties:
Atomic No 32
Atomic weight 72.6
Crystal structure Diamond cubic
Grating Parameter, A 5.657
Density (298oK), g/cm3 5.323
Atomic Density, atoms/cmsup>3 4.42*1022
Melting Temperature °C 937
Boiling Temperature °C 2830
Specific Thermal Capacity (0-100°C), kal/g*degree 0.074
Latent Heat of Fusion, kal/mol 8100
Coefficient of Linear Thermal Expansion (2930K), cm/degree 6.1*10-6
Mohs Hardness 6
Band Gap, direct (300oK), e. V. 0.67
Intrinsic Carriers Concentration (300 oK), cm-6 p,n=5.5*1026*
Intrinsic Drift Mobility (300oK), cm2/v.s.:electronesholes 3800*1820*
Diffusion Coefficient (300oK), cm2/sec:electronesholes 101**49**
Intrinsic Resistivity (300oK),Ohm*cm 47
Optical Properties
Refraction coefficient at 20 oC and λ=10 μm, "n". n=4.0032 +/- 0.0002
Homogeneity of refractive coefficient, Δn <= 2 * 10-4
Temperature coefficient at 20-25 oC, dn/dT, C-1 <= 4 * 10-4
Absorption coefficient (extinction indicator) at λ=10.6 μm, αλ . αλnot more than 0.03 cm
WHILE EVERY ATTEMPT HAS BEEN MADE TO VERIFY THE SOURCE OF THE INFORMATION, NO RESPONSIBILITY IS ACCEPTED FOR ACCURACY OF DATA.