A 330-W single-frequency retrievable multi-tone monolithic fiber amplifier

• Published in: Chinese physics B Vol. 22; no. 4; pp. 274 - 280
• Main Author: 王小林 周朴 冷进勇 杜文博 许晓军
• Format: Journal Article
• Language: English
• Published: 01.04.2013
• Subjects: Amplifiers; Demodulation; Demodulators; Fibers; Lasers; Modulation; Noise levels; Seeds; Sine waves; 光纤放大器; 单片; 单频激光器; 受激布里渊散射; 检索; 相位调制; 调制信号; 输出功率
• ISSN: 1674-1056; 2058-3834; 1741-4199
• DOI: 10.1088/1674-1056/22/4/044205

A single-frequency retrievable phase modulated multi-tone fiber amplifier is presented in theory and demonstrated in experiment. A multi-tone seed laser generated by a sine wave phase modulated single-frequency laser is employed for stimulated Brillouin scattering suppression in an all-fiber amplifier. A demodulation signal which is π phase shifted with respect to the modulation signal is used to retrieve the single-frequency laser from the multi-tone laser. In experiment, we first optimize the all-fiber master-oscillator power-amplifier. With this amplifier, we demonstrate a single-frequency retrievable multi-tone laser with 330-W output when driven by the multi-tone seed, while the ultimate output power is only 130 W when driven by the single-frequency laser. Then, we carry out an experiment for retrieving the single-frequency laser from the amplified multi-tone laser. Results indicate that the single-frequency laser can be retrieved with a sideband suppression of more than 20 dB. Retrieving an even higher power single-frequency laser is possible if a high power demodulator is available.