(ZnGeP2, ZGP) single crystals are the highly-effective non-linear optical material for the middle IR, these crystals have positive birefringence which allows one to carry out the phase matched parametric frequency conversion of optical radiation in all the ranges of their background transparency spectrum from 0.74 to 12.0 µm, however their useful transmission range is from 1.9 to 8.6 µm and from 9.6 to 10.2 µm。

Large nonlinear optical coefficient
High laser damage threshold
High thermal conductivity
Stable mechanical properties
Phase matching ability over a broad spectral region

Second, third, and fourth harmonic generation of CO2 and chemical DF-laser
Optical parametric generation with pumping at a wavelength of 2.0 µm
Up-conversion of CO2 and CO laser radiation to near IR range via harmonics
generation and mixing processes



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