LITTLE KNOWN FACTS ABOUT HGGA2S4 CRYSTAL.

With the appearance of new nonlinear elements and single-frequency pump sources, there is renewed fascination in optical parametric oscillators (OPOs). A single-mode diode-laser-pumped monolithic Nd:YAG nonplanar ring laser that is certainly both amplified and frequency doubled is utilized to pump a monolithic MgO:LiNbO3 pulsed singly resonant OPO.