红外与激光工程
2023, 52(6): 20230292
红外与激光工程
2023, 52(6): 20230267
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
Author Affiliations
Abstract
1 College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China
2 Key Laboratory of Specialty Fiber Optics and Optical Access Networks, Joint International Research Laboratory of Specialty Fiber Optics and Advanced Communication, Shanghai Institute for Advanced Communication and Data Science, Shanghai University, Shanghai 200444, China
An all-fiberized random distributed feedback Raman fiber laser (RRFL) with mode output at 1134 nm has been demonstrated experimentally, where an intracavity acoustically induced fiber grating is employed for modal switching. The maximum output power of mode is 93.8 W with the modal purity of 82%, calculated by numerical mode decomposition technology based on stochastic parallel-gradient descent algorithm. To our best knowledge, this is the highest output power with high purity of mode generated from the RRFL. This work may pave a path towards advanced fiber lasers with special temporal and spatial characteristics for applications.
acoustically induced fiber grating LP11 mode mode decomposition random distributed feedback Raman fiber laser Chinese Optics Letters
2023, 21(2): 021406
Author Affiliations
Abstract
Key Laboratory of Optical Fiber Sensing & Communications (Ministry of Education), University of Electronic Science and Technology of China, Chengdu 611731, China
Cascaded random Raman fiber lasers (CRRFLs) have been used as a new platform for designing high power and wavelength-agile laser sources. Recently, CRRFL pumped by ytterbium-doped random fiber laser (YRFL) has shown both high power output and low relative intensity noise (RIN). Here, by using a wavelength- and bandwidth-tunable point reflector in YRFL, we experimentally investigate the impacts of YRFL on the spectral and RIN properties of the CRRFL. We verify that the bandwidth of the point reflector in YRFL determines the bandwidth and temporal stability of YRFL. It is found that with an increase in the bandwidth of the point reflector in YRFL from 0.2 nm to 1.4 nm, CRRFL with higher spectral purity and lower RIN can be achieved due to better temporal stability of YRFL pump. By broadening the point reflector’s bandwidth to 1.4 nm, the lasing power, spectral purity, and RIN of the 4th-order random lasing at 1 349 nm can reach 3.03 W, 96.34%, and –115.19 dB/Hz, respectively. For comparison, the spectral purity and RIN of the 4th-order random lasing with the point reflector’s bandwidth of 0.2 nm are only 91.20% and –107.99 dB/Hz, respectively. Also, we realize a wavelength widely tunable CRRFL pumped by a wavelength-tunable YRFL. This work provides a new platform for the development of ideal distributed Raman amplification pump sources based on CRRFLs with both good temporal stability and wide wavelength tunability, which is of great importance in applications of optical fiber communication and distributed sensing.
Random fiber laser Raman fiber laser relative intensity noise distributed Raman amplification Photonic Sensors
2022, 12(4): 220414
红外与激光工程
2022, 51(1): 20220015
Author Affiliations
Abstract
College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha410073, China
The quantum defect (QD) is an important issue that demands prompt attention in high-power fiber lasers. A large QD may aggravate the thermal load in the laser, which would impact the frequency, amplitude noise and mode stability, and threaten the security of the high-power laser system. Here, we propose and demonstrate a cladding-pumped Raman fiber laser (RFL) with QD of less than 1%. Using the Raman gain of the boson peak in a phosphorus-doped fiber to enable the cladding pump, the QD is reduced to as low as 0.78% with a 23.7 W output power. To our knowledge, this is the lowest QD ever reported in a cladding-pumped RFL. Furthermore, the output power can be scaled to 47.7 W with a QD of 1.29%. This work not only offers a preliminary platform for the realization of high-power low-QD fiber lasers, but also proves the great potential of low-QD fiber lasers in power scaling.
cladding pumping low quantum defect phosphorus-doped fiber Raman fiber laser High Power Laser Science and Engineering
2022, 10(2): 020000e8
1 清华大学精密仪器系光子测控技术教育部重点实验室, 北京 100084
2 清华大学精密仪器系精密测试技术及仪器国家重点实验室, 北京 100084
级联泵浦的高功率掺镱光纤激光器在近年快速发展,已经成为获取具有优异光谱特性、高亮度、高功率激光光束的重要技术途径。以高功率1018 nm光纤激光器为代表的高亮度级联泵浦激光源的研究和应用,给包括传统波长掺镱光纤激光、高功率随机光纤激光、拉曼光纤激光在内的众多高功率光纤激光领域带来突破性的性能提升。本文总结回顾了级联泵浦高功率掺镱光纤激光器的最新研究进展,介绍了当前实现高性能输出的级联泵浦高功率光纤激光所应用的主要关键技术,并展望了未来研究的方向和挑战。
激光器 高功率光纤激光器 级联泵浦 1018 nm光纤激光器 随机光纤激光 拉曼光纤激光 中国激光
2021, 48(15): 1501004
1 长春理工大学空间光电技术国家和地方联合工程研究中心, 吉林 长春 130022
2 长春理工大学光电工程学院, 吉林 长春 130022
3 长春理工大学材料科学与工程学院, 吉林 长春 130022
报道了一种输出波长为1.7 μm波段的可调谐多波长拉曼光纤激光器。该激光器采用过滤的1550 nm波段自发辐射源来作为泵浦源,从而避免受激布里渊散射。高非线性光纤和色散位移光纤作为非线性增益介质,从而获得峰值波长为1.7 μm波段的增益谱。并采用一段未泵浦的掺铒光纤用于吸收增益谱中残余的泵浦光,所产生的增益谱由Sagnac环滤波器进行滤波。通过调节偏振控制器和放大自发辐射后端的可调谐滤波器,可以产生在1652.77 nm和1686.20 nm之间具有调谐范围大于33.4 nm的单波长激光输出。单波长激光器的光谱3 dB有效线宽为0.08 nm。并且通过增加泵浦功率和调节Sagnac环滤波器实现多波长激光输出,双波长激光可以在1654.88 nm到1664.60 nm之间连续调谐。单波长和双波长激光的边模抑制比均大于45 dB。
激光器 受激拉曼散射 拉曼激光器 可调谐多波长激光器 放大自发辐射 激光与光电子学进展
2020, 57(7): 071403
