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激光二极管侧面泵浦容易将大功率二极管阵列(LDA)光耦合到激光晶体中去,但耦合效率有待于进一步的提高。在已建立的二极管单bar侧面泵浦YAG晶体泵浦光场分布数值模型的基础上,进一步分析了三向侧面泵浦激光器晶体内光强的分布,并全面考虑了耦合系统相关的因素,结合实际设计出LD三向侧面泵浦耦合光学系统,最终获得了重复频率1～1 000 Hz可调,波长1.064μm的TEM00模的调Q窄脉冲激光输出。激光输出最大单脉冲能量为11.5 mJ,脉冲宽度为8 ns,光-光转换效率为11.7%。实验验证了该耦合系统的合理性与优越性,为高效耦合系统的进一步优化奠定了基础。
Laser diode side-pumping easily couples high-power diode arrays (LDAs) into the laser crystal, but the coupling efficiency needs to be further improved. Based on the established numerical model of the pump field distribution of diode-pumped YAG single-bar, the distribution of light intensity in the three-dimensioned side-pumped laser crystal is further analyzed, and the related factors of the coupled system are fully considered. The LD three-way side-pump coupled optical system was designed. Finally, a Q-switched narrow-pulse laser output of TEM00 mode with an adjustable repetition frequency of 1 to 1 000 Hz and a wavelength of 1.064 μm was obtained. The maximum single pulse energy of the laser output is 11.5 mJ, the pulse width is 8 ns, and the light-to-light conversion efficiency is 11.7%. The rationality and superiority of this coupling system are verified by experiment, which lays the foundation for the further optimization of high efficiency coupling system.