High-efficiency all-fiber Raman fiber amplifier with record output power. (8th June 2018)

• Record Type: Journal Article
• Authors: Chen, Yizhu; Leng, Jinyong; Xiao, Hu; Yao, Tianfu; Xu, Jiangming; Zhou, Pu
• Is Part Of: Laser physics letters. Volume 15:Number 8(2018:Aug.)
• Publication Date: 2018-06-08
• Subjects: fiber laser -- Raman laser -- high-power -- laser beam characterization; Lasers -- Periodicals; Physics -- Periodicals; 621.366
• DOI: 10.1088/1612-202X/aac428
• Languages: English
• ISSNs: 1612-2011

Abstract

Abstract: We demonstrate a high-power, high-efficiency all-fiberized Raman fiber amplifier. The system is established on a master oscillator power amplifier configuration. The signal laser is a fiber oscillator operating at 1060 nm, while multiple channels of fiber lasers at 1018 nm work as the pump source. By amplifying in a piece of graded-index fiber, the output power of 1060 nm reaches 528.8 W at maximum, with an optical-to-optical efficiency of 78.8%. The beam parameter M 2 increases from 10.4 to 4.2 through the stokes shift in the Raman fiber, with a corresponding brightness enhancement of about 3.85, which verifies the Raman beam cleanup in the multimode graded-index fiber. To the best of our knowledge, this is the highest-power all-fiber Raman amplifier reported with a brightness enhancement.