Author Affiliations
Abstract
1 Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou, China
2 Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, China
The phase summation effect in sum-frequency mixing process is utilized to avoid a nonlinearity obstacle in the power scaling of single-frequency visible or ultraviolet lasers. Two single-frequency fundamental lasers are spectrally broadened by phase modulation to suppress stimulated Brillouin scattering in fiber amplifier and achieve higher power. After sum-frequency mixing in a nonlinear optical crystal, the upconverted laser returns to single frequency due to phase summation, when the phase modulations on two fundamental lasers have a similar amplitude but opposite sign. The method was experimentally proved in a Raman fiber amplifier-based laser system, which generated a power-scalable sideband-free single-frequency 590 nm laser. The proposal manifests the importance of phase operation in wave-mixing processes for precision laser technology.
high power phase summation single-frequency laser stimulated Brillouin scattering sum-frequency generation High Power Laser Science and Engineering
2023, 11(2): 02000e18
Author Affiliations
Abstract
High Power Laser Science and Engineering
2023, 11(2): 02000e16
Author Affiliations
Abstract
1 Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou, China
2 Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, and Shanghai Key Laboratory of Solid-State Laser and Application, Shanghai, China
High-power continuous-wave single-frequency Er-doped fiber amplifiers at 1560 nm by in-band and core pumping of a 1480 nm Raman fiber laser are investigated in detail. Both co- and counter-pumping configurations are studied experimentally. Up to 59.1 W output and 90% efficiency were obtained in the fundamental mode and linear polarization in the co-pumped case, while less power and efficiency were achieved in the counter-pumped setup for additional loss. The amplifier performs indistinguishably in terms of laser linewidth and relative intensity noise in the frequency range up to 10 MHz for both configurations. However, the spectral pedestal is raised in co-pumping, caused by cross-phase modulation between the pump and signal laser, which is observed and analyzed for the first time. Nevertheless, the spectral pedestal is 34.9 dB below the peak, which has a negligible effect for most applications.
in-band pump Raman fiber laser single-frequency Er fiber amplifier High Power Laser Science and Engineering
2023, 11(1): 010000e3
红外与激光工程
2022, 51(6): 20220127
Author Affiliations
Abstract
1 Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, and Shanghai Key Laboratory of Solid State Laser and Application, Shanghai 201800, China
2 e-mail: zhangl@siom.ac.cn
3 Graduate University of the Chinese Academy of Sciences, Beijing 100049, China
A high power continuous-wave single-frequency green fiber laser by second-harmonic generation of a Yb-doped fiber amplifier (YDFA) is developed. A linearly polarized single-mode fiber amplifier produces a 60 W infrared laser at 1064 nm with a 103 W incident diode pump laser at 976 nm, corresponding to an optical conversion efficiency of 58%. An external bow-tie enhancement cavity incorporating a noncritically phase-matched lithium triborate crystal is employed for second-harmonic generation. A 33.2 W laser at 532 nm is obtained with a 45 W incident 1064 nm fundamental laser, corresponding to a conversion efficiency of 74%.
140.3510 Lasers, fiber 140.3515 Lasers, frequency doubled 140.3615 Lasers, ytterbium Chinese Optics Letters
2017, 15(4): 041402
中国科学院上海光学精密机械研究所, 上海 201800
近年来,高功率拉曼光纤激光器技术发展迅速,输出波长范围覆盖可见光至中红外波段,最大输出功率超过千瓦。在功率提升方面,拉曼光纤激光器技术的发展脉络可概括为:激光振荡器、主振功率放大器和抽运/信号集成放大器。在重要科研应用的驱动下,高功率窄线宽拉曼光纤放大器技术得到显著发展。另外,高功率拉曼光纤激光器技术还有一些新的扩展,包括包层抽运、二极管直接抽运以及拉曼光纤激光合束等,未来发展潜力巨大。
激光技术 拉曼光纤激光器 受激拉曼散射 可调谐激光器