NOT KNOWN FACTS ABOUT HGGA2S4 CRYSTAL

Optical parametric oscillator pumped at ~1 µm with intracavity mid-IR difference-frequency era in OPGaAs1 observes a remarkable boost in era of the second harmonic in addition to the demodulation signals compared to the pump wave amplitude. A clear correlation exists between these nonlinear signatures and the level of damages. Preliminary determin