Author Affiliations
Abstract
1 Center for Photonics and Electronics, Department of Precision Instrument, Tsinghua University, Beijing 100084, China
2 Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
A 21.2 kW, 1.94 times the diffraction-limit quasi-continuous-wave laser is presented in this Letter based on a multi-stage, power-scalable Yb:YAG master-oscillator-power-amplifier (MOPA) system under adaptive optics (AO) control. The output laser of the MOPA system is a rectangular beam with a length-width ratio of 2:1, a 200 μs pulse duration, and a 1000 Hz repetition rate. With the AO control system, the beam quality of the laser is improved from 4.20 to 1.94 times the diffraction limit. To our knowledge, this is the best quality laser in the 20 kW class except for combined lasers.
diode-pumped lasers ytterbium lasers adaptive optics Chinese Optics Letters
2020, 18(6): 061402
Author Affiliations
Abstract
1 Center for Photonics and Electronics, Department of Precision Instruments, Tsinghua University, Beijing 100084, China
2 Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
In this Letter, a 116-actuator deformable mirror (DM) was used to correct the wavefront distortion in a 10.7 J, 10 Hz neodymium-doped yttrium aluminum garnet (Nd:YAG) slab amplifier. By applying a pump-light homogenizer to transform the 3 × 1 near-field beam array into an integrated beam, the beam quality was greatly improved from 5.54 times diffraction limit (TDL) to 1.57 TDL after being corrected by the DM. To the best of our knowledge, this is the first investigation on beam quality control of an arrayed near-field beam in high-energy diode-pumped solid-state lasers.
140.3280 Laser amplifiers 140.3480 Lasers, diode-pumped 220.1080 Active or adoptive optics 220.1000 Aberration compensation Chinese Optics Letters
2019, 17(5): 051403
Author Affiliations
Abstract
We demonstrate a high power high beam quality diode-pumped 1 112-nm Nd:YAG master-oscillator poweramplifier (MOPA) laser system. To increase the extraction efficiency and output power, a four-pass amplifier scheme is employed. Finally, the injected laser output power is amplified from 26 to 64 W with beam quality factor M2=2.85. Furthermore, a theoretical model that takes the temporal overlap inversion number dynamics into account is employed to analyze the performance of the MOPA laser system, and a good agreement with the experimental data is obtained.
140.3280 Laser amplifiers 140.3538 Lasers, pulsed 140.3480 Lasers, diode-pumped Chinese Optics Letters
2014, 12(3): 031404
1 中国科学院 电子学研究所,北京 100190
2 中国科学院 研究生院,北京 100049
高功率气体激光器的非对称复杂电极系统中,电极参数的变化以及预电离结构的引入将会使所设计的均匀电场发生具体的改变。采用高精度有限元方法,对这类复杂电极系统进行建模并且计算其电场分布,根据分析结果更合理地指导激光器设计。对一种典型的非对称复杂电极系统TEA CO2激光器,应用该方法并结合了预电离过程,研究了引入预电离器导体和变化电极形状对电极表面的电场强度起伏和放电空间的均匀电场面积产生的影响。结果表明:通过这种预先模拟,合理选择电极构型参数和预电离结构安装位置,可以产生性质较好的均匀电场以及效率较高的激光输出。
TEA CO2激光器 气体放电 印刷电路板预电离 均匀场电极 电场计算 TEA CO2 laser gas discharge PCB Preionization uniform field electrode electric field calculation
1 中国科学院 电子学研究所,北京 100190
2 中国科学院 研究生院,北京 100049
设计了一种非对称电极,这种非对称电极的阳极是Chang电极或Ernst电极,阴极是由直线和圆弧构成的简单电极。通过比较和分析非对称电极和对称电极的特点发现,非对称电极系统中简单电极的边缘电场起伏最大。采用有限元方法计算了非对称电极系统中的简单电极取不同的直线长度和弧线半径时,非对称电极系统的电场分布,给出了选择非对称电极系统中的简单电极参数的依据。结果表明:这种非对称电极系统结合了解析电极和简单电极的优点,通过选择非对称电极系统的简单电极参数,它可以在TEA CO2激光器中产生边缘电场起伏小于0.06,且满足电极表面均匀场面积宽度要求的电场。
TEA CO2激光器 均匀场电极 非对称电极 电场计算 解析对称 TEA CO2 laser uniform field electrode asymmetric electrodes electric field calculation analytical symmetriy
1 中国科学院 电子学研究所，北京 100080
2 中国科学院 研究生院，北京 100039
提出了一种适用于大功率TEA CO2气体激光器的新型Rogowski电极横截面设计方法，经过构造和分析这种截面后，对这种截面进行了比较和电场的分析，并对这种截面的参数设计提出了参考性建议。结果证明，此设计给大体积横向放电激光器的电极截面的选择提供了一种新的途径。
TEA CO2 激光器 电极设计 Rogowski电极 电场 激光与光电子学进展
2008, 45(10): 46
