Abstract

A compact high-power laser diode (LD) side-pumped Tm,Ho:YAG laser at 2.09 μm was experimentally and theoretically investigated. Using a Tm,Ho:YAG crystal rod with a high dopant concertation ratio (3.0 at.% Tm³⁺ and 0.1 at.% Ho³⁺) and carefully optimizing the laser system design, a maximum continuous-wave (CW) output power of 87.7 W was achieved at a near room temperature (RT) of 12 ℃, corresponding to an optical-to-optical (o–o) efficiency of 13.3% and a slope efficiency of 21.2%. To the best of our knowledge, this represents the highest output power ever reported for a Tm–Ho co-doped solid-state laser. Furthermore, we numerically analyzed the multimode laser operation with a modified co-operative up-conversion rate. The agreement between the simulation results and the experimental data indicated that a high dopant concentration ratio with low up-conversion losses was favorable for achieving high-power output of the Tm,Ho:YAG lasers, thus paving the way for further advancements in Tm–Ho co-doped lasers.

中文翻译：

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激光二极管侧面泵浦Tm,Ho:YAG激光器的实验与理论研究

摘要

对 2.09 μm 紧凑型高功率激光二极管 (LD) 侧面泵浦 Tm,Ho:YAG 激光器进行了实验和理论研究。采用高掺杂配比（3.0 at.% Tm ³⁺和 0.1 at.% Ho ³⁺）的 Tm,Ho:YAG 晶棒并精心优化激光系统设计，获得最大连续波（CW）输出功率在 12 ℃ 的近室温 (RT) 下实现了 87.7 W 的功率，对应于 13.3% 的光光 (o-o) 效率和 21.2% 的斜率效率。据我们所知，这代表了迄今为止报道的 Tm-Ho 共掺杂固态激光器的最高输出功率。此外，我们对具有修改的协作上转换速率的多模激光器操作进行了数值分析。模拟结果与实验数据之间的一致性表明，高掺杂浓度比和低上转换损耗有利于实现Tm,Ho:YAG激光器的高功率输出，从而为Tm–的进一步发展铺平了道路。 Ho共掺杂激光器。