Abstract

Significant amount of effort has been made in the development of diode laser pumped green light Nd:YVO4 through intracavity frequency doubling in recent years. The sum frequency generation from longitudinal modes often cause the so called 'green problem' even at low power operation [1]. Nonetheless, it has been shown that higher frequency conversion efficiency can be made possible by utilizing the interplay between second harmonic and sum frequency generation to produce periodic pulse oscillation [2]. In this paper, we are showing that under cross-polarized two-mode oscillation (CPTMO), the convergent efficiency can be 50 % higher than that of parallel polarized two-mode oscillation (PPTMO).

© 1997 Optical Society of America