ZnGeP2 crystals are considered as state-of-the-art mid-IR nonlinear crystals due to unique properties. They exhibit an excellent nonlinearity and thermal conductivity together with a relatively high laser induced damage threshold. ZGP crystal can be successfully implemented in high-power mid-IR harmonic generators, difference frequency generators and optical parametric oscillators due its broad useful transmission range (0.7-12 µm).
Applications:
Harmonic generation of CO2 and CO laser fundamental wavelength
Generation of continuously tunable radiation in MWIR, LWIR range by OPO and DFG techniques
Generation of terahertz range frequencies
Performance comparison of commonly used mid-infrared birefringent uniaxial crystals:
Material | ZnGeP2 | AgGaSe2 | CdGaAs2 | CdS | CdSe |
Energy gap(eV) | 2.02 | 1.83 | 0.67 | 2.42 | 1.73 |
Absorption Coef, λ=10.6µm | 0.9cm-1 | 0.089cm-1 | 0.14cm-1 | 0.007cm-1 | 0.0015cm-1 |
Refractive index, λ=10.6µm | no=3.0738 | no=2.5917 | no=3.5054 | no=2.2245 | no=2.4258 |
ne=3.1137 | ne=2.5585 | ne=3.5922 | ne=2.2376 | ne=2.4437 | |
Max. light | 55 | 65 | 60 | 70 | 71 |
Transmittance | 0.7-12µm | 0.7-19µm | 0.7-20µm | 2.5-15µm | 0.8-25µm |
Mohs hardness | 5.5 | 3-3.5 | 3.5-4 | 3.4 | 3.25 |
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