Abstract
The output characteristics of a continuous-wave flash lamp pumped Nd:YAG laser, passively Q-switched by Cr<SUP>4+</SUP>:YAG are reported. In order to control the small-signal transmission of the passive Q-switch, a new method, which made use of a miniature laser placed out of the resonator, is described theoretically and proved experimentally. Further, the combination of a Cr<SUP>4+</SUP>:YAG passive Q-switch and an acoustooptic Q- switch that work together in a Nd:YAG CW pumped laser was investigated. With a two-rod resonator and a Cr<SUP>4+</SUP>:YAG crystal as saturable absorber, an average laser output power over 180W was reached. The pulse-to-pulse stability was 1%. Folded resonator was used in order to obtain intracavity second harmonic generation in active and passive Q-switch mode.
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