高功率、宽调谐掺Tm光纤主振荡功率放大器

High-Power Widely-Tunable Tm:Fiber Master Oscillator Power Amplifier

输出波长位于2μm附近的可调谐掺Tm激光器在光通信、激光雷达、环境监测等领域都有广泛的应用。介绍了基于主振荡功率放大(MOPA)方式的高功率、宽调谐掺Tm光纤放大器的实验研究。其中,主振荡系统采用闪耀光栅的Littrow衍射提供外腔反馈和波长选择,实现了调谐范围超过160nm(1921～2084nm)的低功率激光输出。为提高该激光器的输出功率,采用MOPA方式对其进行一级放大,实现了高功率、宽调谐激光输出。调谐范围大于140nm(1936～2081nm),且在大于100nm(1962～2066nm)范围内输出功率均超过54W。在中心波长1981nm处,获得功率为77.4W,斜率效率为34.4%的高功率激光输出。

Tunable Tm： fiber lasers within a wavelength range around 2μm have numerous applications such as communications, lidar etc.. In this paper, a high power, widely-tunable Tm：fiber master oscillator power amplifier （MOPA） system is reported. The master oscillator is tunable over 160 nm （1921-2084 nm） by use of a diffraction grating, which is placed in the Littrow configuration to provide wavelength selective feedback. The MOPA laser is tunable over 140 nm （1936-2081 nm） and continuous-wave output power higher than 54 W is obtained over a tuning range of 100 nm from 1962 nm to 2066 nm, limited by the seed laser tuning range. The laser yields 77.4 W output power at 1981 nm, corresponding to a slope efficiency of 34.4 %.