WHAT DOES HGGA2S4 CRYSTAL MEAN?

Optical parametric oscillator pumped at ~1 µm with intracavity mid-IR difference-frequency era in OPGaAsIt has lengthy been predicted which the period difference between the signal and idler subharmonic outputs of an optical parametric oscillator (OPO) undergoes a random walk course of action, much like the stage diffusion of the laser [one].This