Author Affiliations
Abstract
1 Key Laboratory of High Power Laser and Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
2 National Laboratory on High Power Laser and Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
3 University of Chinese Academy of Sciences, Beijing 100049, China
A high-power, Joule-class, nanosecond temporally shaped multi-pass ring laser amplifier system with two neodymium-doped phosphate glass (Nd:glass) laser heads is demonstrated. The laser amplifier system consists of three parts: an all-fiber structure seeder, a diode-pumped Nd:glass regenerative amplifier and a multi-pass ring amplifier, where the thermally induced depolarization of two laser heads is studied experimentally and theoretically. Following the injection of a square pulse with the pulse energy of 0.9 mJ and pulse width of 6 ns, a 0.969-J high-energy laser pulse at 1 Hz was generated, which had the ability to change the waveform arbitrarily, based on the all-fiber structure front end. The experimental results show that the proposed laser system is promising to be adopted in the preamplifier of high-power laser facilities.
depolarization compensation laser amplifier neodymium laser ring laser High Power Laser Science and Engineering
2019, 7(1): 010000e8
Author Affiliations
Abstract
1 Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
2 National Laboratory on High Power Laser and Physics, Shanghai 201800, China
We demonstrate a laser diode end-pumped helium gas-cooled multislab Nd:glass laser amplifier. The design and thermal management of the proposed laser amplifier are discussed. The thermally induced wavefront aberration of the slabs was also measured and compared with simulation results. A small-signal single-pass longitudinal gain of 1.8 was measured with a pump energy of 7.3 J. With an injected seed energy of 0.6 mJ, the output energy from the amplifier reached 0.5 J at 0.2 Hz and 0.43 J at 0.5 Hz in a multipass extraction geometry, thus demonstrating the feasibility of diode-pumped, high-energy lasers with direct gas cooling.
laser diode gas cooling Nd:glass wavefront aberration laser amplifier. High Power Laser Science and Engineering
2018, 6(2): 02000e15
Author Affiliations
Abstract
1 中国科学院上海光学精密机械研究所高功率激光物理联合实验室， 上海 201800
2 中国科学院大学, 北京 100049
When high-power solid laser working in high repetition rate, the laser output wave-front changes due to the thermal distortion, which is caused by the gain medium under the heat deposition. Therefore, the coherent modulation imaging technology is used to realize the measurement of the laser output wave-front from one frame of diffraction intensity recorded. The phases of thermal distortion of the optical element are obtained when the amplifier working in 1, 5, 7 Hz frequency. Experimental results show that thermal distortion effect is significantly increased, the heat is concentrated toward the center region and the phase change increases as the working frequency increases.
测量 高功率激光 波前测量 相位恢复 热畸变 相干调制成像 measurement high-power laser wave-front measurement phase recovery thermal distortion coherent modulation imaging Collection Of theses on high power laser and plasma physics
2016, 14(1): 1101002
1 中国科学院上海光学精密机械研究所高功率激光物理联合实验室， 上海 201800
2 中国科学院大学, 北京 100049
高功率固体激光器工作在高重复频率时，增益介质因热量的沉积而发生热畸变，导致激光输出波前发生变化。为此，利用相干调制成像技术通过记录单幅衍射光斑实现输出光场的波前测量，获得了放大器工作在1,5,7 Hz频率时光学元件的热畸变相位。实验结果显示，随着工作频率增大，热量向中心区域集中，热沉积效应明显增加了波前变化。
测量 高功率激光 波前测量 相位恢复 热畸变 相干调制成像 中国激光
2016, 43(11): 1101002
