LITTLE KNOWN FACTS ABOUT HGGA2S4 CRYSTAL.

Optical parametric oscillator pumped at ~1 µm with intracavity mid-IR big difference-frequency generation in OPGaAs1 observes a dramatic increase in technology of the 2nd harmonic along with the demodulation alerts vs . the pump wave amplitude. A transparent correlation exists in between these nonlinear signatures and the amount of damages. Prelim