Alexandrite laser in Q-switched single longitudinal mode operation pumped by a fiber-coupled diode module
Alexandrite laser in Q-switched single longitudinal mode operation pumped by a fiber-coupled diode module
复制标题
由光纤耦合二极管模块泵浦的调Q单纵模操作中的紫翠玉激光器
DOI：
--
复制
发表时间：
2019
期刊：
影响因子：
--
通讯作者：
J. Höffner
中科院分区：
文献类型：
--
作者：
A. Munk;B. Jungbluth;M. Strotkamp;H. Hoffmann;R. Poprawe;J. Höffner
在这项工作中，提出了一种在钾共振线处以单纵模 (SLM) 运行的二极管泵浦 Q 开关紫翠玉激光器。自主开发的激光二极管泵浦装置采用光纤耦合（ = 400μm，NA=0.22），在636 nm处提供18 mJ的泵浦能量，脉冲持续时间为120 μs，重复频率为500 Hz。单程穿过 7 毫米长晶体时未被吸收的泵浦光被重新准直、调整偏振并重新聚焦到晶体中。紫翠玉激光器在 500 Hz 的重复频率下产生 1.7 mJ 的脉冲能量，具有 0.2 % (rms) 的高脉冲间稳定性，并且在两个空间方向上的光束质量为 M2 < 1.1。输出光束是圆形且像点的，无需进一步光束整形。该激光系统的电光效率为 2%，比同类闪光灯泵浦紫翠玉激光系统高出大约两个数量级。通过在谐振器中注入 SLM 二极管激光器并主动稳定腔长，可实现在 769.898 nm 的钾谐振线处进行 SLM 操作，线宽约为 10 MHz。因此，该激光器满足谐振激光雷达系统的所有要求。本出版物中提出的研究表明了在红色光谱区域使用光纤耦合泵浦模块泵浦复杂环形谐振器的可行性。这为紧凑型激光雷达系统在恶劣环境条件下进行自主测量迈出了重要的一步。
In this work a diode-pumped Q-switched Alexandrite laser operating in single longitudinal mode (SLM) at the potassium resonance line is presented. The self-developed laser diode pump device is fiber-coupled ( = 400μm, NA=0.22) and delivers a pump energy of 18 mJ at 636 nm with a pulse duration of 120 μs and a repetition rate of 500 Hz. Pump light not absorbed in single-pass through the 7 mm long crystal is recollimated, polarization adjusted and refocused into the crystal. The Alexandrite laser yields a pulse energy of 1.7 mJ at a repetition rate of 500 Hz with a high pulse-to-pulse stability of 0.2 % (rms) and a beam quality of M2 < 1.1 in both spatial directions. The output beam is round and stigmatic without further beam shaping. The electro-optical efficiency of the laser system is 2 % which is approximately two magnitudes higher than of comparable flashlamp-pumped Alexandrite laser systems. By seeding the resonator with a SLM diode laser and actively stabilizing the cavity length, SLM-operation at the resonance line of potassium at 769.898 nm with a linewidth of approximately 10 MHz is achieved. Thereby the laser fulfills all the requirements for a resonance-lidar system. The investigations presented in this publication show the feasibility for pumping a complex ring resonator with a fibercoupled pump module in the red spectral region. This presents an important step to compact lidar systems for autonomous measurements under rough environmental conditions.
具有波长可调性的连续波紫翠玉环形激光器的单向单频操作。
影响因子：
3.8
作者：
Sheng X
通讯作者：
Sheng X