NOT KNOWN FACTS ABOUT HGGA2S4 CRYSTAL

Optical parametric oscillator pumped at ~1 µm with intracavity mid-IR variation-frequency generation in OPGaAsIt has very long been predicted the period difference between the signal and idler subharmonic outputs of an optical parametric oscillator (OPO) undergoes a random walk process, comparable to the period diffusion of a laser [one].This syst