Photonics Research, 2020, 8 (3): 03000414, Published Online: Feb. 28, 2020   

High-efficiency and high-power single-frequency fiber laser at 1.6 μm based on cascaded energy-transfer pumping Download: 858次

Author Affiliations
1 School of Physics and Optoelectronics, South China University of Technology, Guangzhou 510640, China
2 State Key Laboratory of Luminescent Materials and Devices and Institute of Optical Communication Materials, South China University of Technology, Guangzhou 510640, China
3 Guangdong Engineering Technology Research and Development Center of High-performance Fiber Laser Techniques and Equipment, Zhuhai 519031, China
4 Hengqin Firay Sci-Tech Company Ltd., Zhuhai 519031, China
5 Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and Devices, Guangzhou 510640, China
6 Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, South China University of Technology, Guangzhou 510640, China
7 e-mail: pengfeima_scut@163.com
Abstract
In this paper, a technique combining cascaded energy-transfer pumping (CEP) method and master-oscillator power-amplifier (MOPA) configuration is proposed for power scaling of 1.6-μm-band single-frequency fiber lasers (SFFLs), where the Er3+ ion has a limited gain. The CEP technique is fulfilled by coupling a primary signal light at 1.6 μm and a C-band auxiliary laser. The numerical model of the fiber amplifier with the CEP technique reveals that the energy transfer process involves the pump competition and the in-band particle transition between the signal and auxiliary lights. Moreover, for the signal emission, the population density in the upper level is enhanced, and the effective population inversion is achieved thanks to the CEP. A single-frequency MOPA laser at 1603 nm with an output power of 52.6 W and an improved slope efficiency of 30.4% is experimentally obtained through the CEP technique. Besides, a laser linewidth of 5.2 kHz and a signal-to-auxiliary laser ratio of 60.7 dB are obtained at the maximum output power. The proposed technique is anticipated to be promising for increasing the slope efficiency and power scaling for fiber lasers operating at L band.

Xianchao Guan, Qilai Zhao, Wei Lin, Tianyi Tan, Changsheng Yang, Pengfei Ma, Zhongmin Yang, Shanhui Xu. High-efficiency and high-power single-frequency fiber laser at 1.6 μm based on cascaded energy-transfer pumping[J]. Photonics Research, 2020, 8(3): 03000414.

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