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CdGeAs2, Cadmium Germanium Arsenide (CGA)
Positive uniaxial crystal: ne > no
Molecular mass: 334.753
Specific gravity: 5.60 g/cm3 [1]
Point group: ¯42m
Mohs hardness: 3.5–4
Knoop (or Vickers) hardness: 485 at indenter load 50 g [2]
Melting point: 933K
About the crystal
Though cadmium germanium arsenide possesses one of the highest second-order
nonlinear coefficients, good optical quality crystals of this material are difficult to
grow. Recently, Schunemann succeeded in growing CGA crystals with absorption
coefficients less than 0.1 cm−1 at 4.6- and 9.2-µm wavelengths [11], which were
used in DFG [10] and OPG [21] applications by Vodopyanov.
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