Many pulsed laser systems exhibit pronounced laser spiking, or relaxation oscillations, when operated with a long pulse length. This spiking behavior is detrimental to several applications, including medicine where fiber-optic delivery of high energy, low power, pulsed laser radiation is required, and sum-frequency mixing where the independent spiking of two laser pulses results in low mixing efficiency. This paper reports the efficient suppression of laser spiking, by intracavity second-harmonic generation, in long-pulse, pulse-pumped 1.06 μm and 1.32 μm Nd:YAG lasers.1

© 1989 Optical Society of America

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