Author Affiliations
Abstract
1 College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China
2 School of Information and Communications, National University of Defense Technology, Wuhan 430035, China
3 Nanhu Laser Laboratory, National University of Defense Technology, Changsha 410073, China
4 Hunan Provincial Key Laboratory of High Energy Laser Technology, National University of Defense Technology, Changsha 410073, China
High-power ultrafast laser amplification based on a non-polarization maintaining fiber chirped pulse amplifier is demonstrated. The active polarization control technology based on the root-mean-square propagation (RMS-prop) algorithm is employed to guarantee a linearly polarized output from the system. A maximum output power of 402.3 W at a repetition rate of 80 MHz is realized with a polarization extinction ratio (PER) of > 11.4 dB. In addition, the reliable operation of the system is verified by examining the stability and noise properties of the amplified laser. The M2 factor of the laser beam at the highest output power is measured to be less than 1.15, indicating a diffraction-limited beam quality. Finally, the amplified laser pulse is temporally compressed to 755 fs with a highest average power of 273.8 W. This is the first time, to the best of our knowledge, that the active polarization control technology was introduced into the high-power ultrafast fiber amplifier.
active polarization control root-mean-square propagation algorithm linearly polarized laser chirped pulse amplification femtosecond laser fiber laser Chinese Optics Letters
2024, 22(4): 041403
1 中国科学院上海光学精密机械研究所上海市全固态激光器与应用技术重点实验室, 上海 201800
2 中国科学院大学材料与光电研究中心, 北京 100049
3 南京先进激光技术研究院, 江苏 南京 210038
介绍了一种用于偏振控制的遗传退火算法(GASA),该算法在遗传算法(GA)的基础上,引入了模拟退火的选择机制,将蒙特卡罗思想引入到了GA中,使算法具有更加强大的搜索能力。通过建立基于GASA算法的光纤激光主动偏振控制系统的数学模型,得到了不同参量情况下的GASA算法的仿真图像,并且分析了其收敛效果。仿真结果表明,在选择输出激光的偏振消光比作为适应度函数,种群数量为90,变异概率为0.7,交叉概率为0.001,温度下降比率为0.99的情况下,系统可以达到最优的控制效果。将GASA算法和随机并行梯度下降算法的仿真图像进行对比,可以看出,GASA算法具有较好的全局搜索能力和跳出局部最优值的能力,可以将其用在光纤激光的主动偏振控制系统中。
激光器 光纤激光器 主动偏振控制 控制算法 光学学报
2020, 40(23): 2314002
1 中国科学院上海光学精密机械研究所上海市全固态激光器与应用技术重点实验室, 上海 201800
2 中国科学院大学材料与光电研究中心, 北京 100049
光纤激光的主动偏振控制技术,可以在非保偏光纤中输出高消光比的激光。与保偏光纤激光器产生保偏激光相比,这种方法具有工艺简单、价格低廉的特点。本文主要介绍了主动偏振控制技术的基本原理,系统地阐述了近年来光纤激光主动偏振控制技术在国内外的发展情况,归纳了主动偏振控制技术发展的大致趋势。对主动偏振控制和偏振相干合成的锁相算法进行了简单的整理,最后对其发展方向进行了展望。
激光技术 光纤激光器 主动偏振控制 锁相 相干合成 优化算法 激光与光电子学进展
2019, 56(10): 100001
