In this paper, a laser diode with a center wavelength of 444nm is used as the pump source. Based on the pre-laser mode selection technology, combined with the F-P etalon technology for auxiliary mode selection, a single-longitudinal-mode pulse laser with a center wavelength of 639.7nm is developed. In the experiment, a stable single-longitudinal-mode laser output under high energy injection is realized by optimizing the parameters of the laser insertion element. When the output power of the pump source is 10.8W and the repetition rate is 20kHz, the maximum single-longitudinal-mode output pulse energy is 10.25μJ, the peak power is 170W, and the pulse width is 77.66ns.
We develop a theoretical model of multimode rate equation that accurately describes mode evolution mechanism of prelase Q-switched Pr3+:YLF single longitudinal mode (SLM).The theoretical simulation process explained each part of the operation and experimental phenomenon in the pre-lase process effectively.We identify that there is an optimal parameter for the two step signal of acoustic-optic modulator which determines the stability of SLM output.Our theoretical model can be applied to most solid-state lasers, and offer theoretical references for the design and construction of experimental facilities, which is significant for future research.Up to now, there is still not a complete theory to accurate description of prelase Q-switching technology. Moreover, there have been no reported about directly emitting Q-switched SLM laser in the visible region.
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