DPAL activities in Japan: update

M. Endo, Hiroki Nagaoka, F. Wani
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Abstract

Activities on diode pumped alkali laser (DPAL) in Japan are updated. Since the last presentation in Chengdu, we have continued our DPAL research mainly targeting the development of tools for future scaling-up and high-efficiency operation. In particular, the focus is on a numerical simulation that combines computational fluid dynamics (CFD) and wave optics. To confirm the agreement between the experimental and simulation results, we designed and built several experimental apparatuses. Our latest gas-flow type DPAL produced 15.5 W output power with 80% slope efficiency based on the absorbed pump light. The agreement with theoretical prediction was excellent not only for output power but also for transverse mode shape and beam quality. Additionally, to accurately predict the performance of Cs DPAL, we measured the main reaction cross sections, namely, mixing and quenching reaction cross sections of the two P states of Cs with various hydrocarbon buffer gases. The main result of the repetitive pulsed operation by the cavity dumping technique and relevant numerical simulation is also discussed.
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DPAL在日本的活动:更新
介绍了日本二极管抽运碱激光器(DPAL)的最新研究进展。自上次在成都的演讲以来,我们一直在继续我们的DPAL研究,主要针对未来扩大规模和高效操作的工具开发。特别是,重点是结合计算流体动力学(CFD)和波动光学的数值模拟。为了验证实验结果与仿真结果的一致性,我们设计并制作了几个实验装置。我们最新的气体流型DPAL根据吸收的泵光产生15.5 W的输出功率,斜率效率为80%。不仅在输出功率上,而且在横模振型和光束质量上都与理论预测吻合良好。此外,为了准确预测Cs DPAL的性能,我们测量了主要反应截面,即Cs的两种P态与各种碳氢化合物缓冲气体的混合和淬火反应截面。讨论了用空腔倾倒技术进行重复脉冲操作的主要结果和相应的数值模拟。
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