ZnGeP2（Zinc germanium phosphide）crystal has many good properties and is an mid-IR nonlinear crystal. The nonlinear susceptibility of ZnGeP2 (ZGP) crystal is approximately 160 times large (d36~75 pm/V) as KDP,.ZGP shows good optical transparency over the 740 – 12000 nm and relatively high laser damage threshold, and is therefore well suited for producing near infrared tunable laser. ZGP is a very hopeful material for mid-infrared devices such as SHG, SFG, OPO, and OPG/OPA.
|SHG Phase Matchable Range||3177 ∼ 10357nm (Type I)|
|NLO coefficients||d36=75 ± 8 pm/V|
|Type Ⅰ deeo=d36 sin2θcos2φ|
|Type Ⅱ doeo=deoo=d36 sinθsin2φ|
|at 2.79 um||30 GW/cm2 (150 ps)|
|at 10.6 um||1 GW/cm2 (2 ns)|
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