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The application of an intracavity-injecting technique to a Q-switched Nd:YAG oscillator for efficiently generating high-power nanosecond pulses is described. Nanosecond pulses produced are synchronizable, reproducible, and remarkably stable. Applications of the technique to other types of lasers are discussed.

The observation of regenerative oscillation in a laser-pumped dye laser is reported. Pulse trains of 1-nsec pulses have been observed from a rhodamine 6G dye laser pumped with a 50-nsec pulse at 5320 A. The regenerative oscillation is produced by using a novel cavity-flipping technique recently developed. The principle of this technique and experimental results in a dye laser are described.

We have demonstrated high-average-power second-harmonic generation with an output power of 5.6 W at 532 nm by intracavity frequency doubling using Type II KTiOPO(4) in a Nd:YAG laser oscillator acousto-optically Q switched at 5 kHz.(1) The average power achieved, limited only by the power-supply current available in these experiments, was about three times higher than what has been obtained in a state-of-the-art device using LiIO(3) as the doubler. More significantly, since no intrinsic limitations, such as saturation and material damage, have yet been observed, further improvement in the power output should be achievable. It is pointed out that previous studies on intracavity second-harmonic generation have been limited to the small-signal case; the present result shows the feasibility of operating an internally doubled oscillator for efficiently converting the fundamental to its harmonic in a high-power device.