高功率低温Yb:YAG薄片再生放大器激光振荡器的输出特性

Output characteristics of high power cryogenic Yb:YAG TRAM laser oscillator.

作者信息

Furuse Hiroaki, Kawanaka Junji, Miyanaga Noriaki, Chosrowjan Haik, Fujita Masayuki, Takeshita Kenji, Izawa Yasukazu

机构信息

Institute for Laser Technology, 2-6 Yamada-oka, Suita, Osaka, Japan.

出版信息

Opt Express. 2012 Sep 10;20(19):21739-48. doi: 10.1364/OE.20.021739.

DOI:10.1364/OE.20.021739

PMID:23037293

Abstract

We analyzed the output power characteristics of a cryogenically cooled Yb:YAG total-reflection active-mirror (TRAM) laser oscillator including the temperature dependence of the emission cross section and the reabsorption loss of the Yb:YAG TRAM. A CW multi-transverse mode oscillation of a 9.8 at.% doped 0.6 mm thick Yb:YAG ceramic TRAM was investigated for various pump spot sizes and compared with theoretical results. The Yb:YAG temperatures were inferred from the ratio between fluorescence intensities at 1022 nm and 1027 nm which varied significantly with temperature below 200 K. Output power calculations using evaluated temperatures were in good agreement with the experimental data measured between 77 and 200 K, and the output power suppression due to the temperature rise observed above ~140 K. To the best of our knowledge, this is the first evaluation of output power for a cryogenically cooled Yb:YAG TRAM laser.

摘要

我们分析了低温冷却的掺镱钇铝石榴石（Yb:YAG）全反射有源镜（TRAM）激光振荡器的输出功率特性，包括Yb:YAG TRAM发射截面的温度依赖性和再吸收损耗。研究了掺杂浓度为9.8 at.%、厚度为0.6 mm的Yb:YAG陶瓷TRAM在不同泵浦光斑尺寸下的连续波多横模振荡，并与理论结果进行了比较。Yb:YAG温度是根据1022 nm和1027 nm处荧光强度之比推断出来的，该比值在200 K以下随温度变化显著。使用评估温度进行的输出功率计算与在77至200 K之间测量的实验数据吻合良好，并且在约140 K以上观察到由于温度升高导致的输出功率抑制。据我们所知，这是对低温冷却的Yb:YAG TRAM激光器输出功率的首次评估。