Abstract
Compact, long-lived, and efficient visible-light sources with coherent radiation have been required for high-density optical disk systems. Much attention has been attracted by second harmonic generation (SHG) in a diode-pumped Nd:YAG laser in which a nonlinear optical crystal KTiOPO4 (KTP) is placed within a laser resonator. However, there is a serious problem, called “green problem,”1 that low-frequency noise is inherent arising from the mode coupling due to sum-frequency generation in the nonlinear optical crystal.
© 1991 Optical Society of America
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