红外与激光工程, 2019, 48 (4): 0405002, 网络出版: 2019-07-23  

泵浦线宽和波长飘移对全固态Tm激光器性能的影响

Influence of pump bandwidth and wavelength-drift on laser performance of solid-state Tm laser
作者单位
1 中国科学院福建物质结构研究所 光电材料化学和物理重点实验室, 福建 福州 350002
2 中国科学院大学, 北京 100049
摘要
为了研究泵浦带宽和波长飘移对全固态激光器的影响, 进行了光谱分析和热效应分析, 该分析是在准三能级Tm: YAG激光器上进行的。提出光谱模型和晶体热模型, 用来研究不同泵浦带宽下Tm激光器的效率和热效应。在Tm激光实验中, 结构紧凑、高效率的键合Tm激光器得到验证, 中心波长输出在2 013.2 nm。这一激光器的泵浦源是0.1 nm窄线宽的光纤耦合激光二极管, 其输出波长是784.9 nm。最大输出功率为7.96 W, 斜率效率为62.5%, 光-光转换效率为53.3%。当耦合透过率为3%时, 激光功率从1.87 W增大到14.93 W, 激光波长从2 013.25~2 014.53 nm飘移。当耦合透过率为5%时, 输出波长从2 013.91 nm飘移到2 014.26 nm。尽管晶体的最高温度会稍有上升, 但0.1 nm窄带宽泵浦可以有效提高激发效率, 因此具有更高的激光效率。通过综合考虑泵浦带宽和波长飘移以及增益介质的光谱分布, 该研究可以扩展到其他固体激光器来选择泵浦源, 有助于实现高效的激光系统。
Abstract
In order to study the influence of pump bandwidth and wavelength-drift on the performance of solid-state lasers, theoretical analyses were performed on a quasi-three-level Tm:YAG laser, and the corresponding theoretical models, including both spectral and thermal models, were presented. In the Tm laser experiment, a compact and high-efficiency composite Tm laser operating at 2 013.2 nm was demonstrated, which was end-pumped by volume Bragg gratings(VBGs) locked laser diode(LD) with emission wavelength centered at 784.9 nm and bandwidth as narrow as 0.1 nm(full width at the half maximum, FWHM). A maximum output power of 7.96 W was obtained with a slope efficiency of 62.5% and optical conversion efficiency of 53.3%, respectively. The maximum laser wavelength drifted from 2 013.25 nm to 2 014.53 nm when increasing the absorbed pump power from 1.87 W to 14.93 W for the 3% output coupling. As for 5% output coupling, the drift was from 2 013.91 nm to 2 014.26 nm. It was found that a narrow LD bandwidth of 0.1 nm resulted in a more pronounced excitation efficiency and thus a higher laser efficiency, despite that the maximum temperature within the crystal was slightly higher. The present study could be extended to other solid-state lasers for the choice of pump source by comprehensively considering the pump bandwidth and wavelength-drift and the spectral profiles of gain medium, which would be helpful for an efficient laser system.

王娟, 黄海洲, 黄见洪, 葛燕, 戴殊韬, 邓晶, 林紫雄, 翁文, 林文雄. 泵浦线宽和波长飘移对全固态Tm激光器性能的影响[J]. 红外与激光工程, 2019, 48(4): 0405002. Wang Juan, Huang Haizhou, Huang Jianhong, Ge Yan, Dai Shutao, Deng Jing, Lin Zixiong, Weng Wen, Lin Wenxiong. Influence of pump bandwidth and wavelength-drift on laser performance of solid-state Tm laser[J]. Infrared and Laser Engineering, 2019, 48(4): 0405002.

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