715 W sub-kHz single-frequency all-fiber amplifier at 1064 nm based on commercial PM-LMA fiber
Year: 2025
Type: article
Abstract: We report a high-power single-frequency fiber amplifier operating at 1064 nm, delivering 715 W output with a sub-kHz linewidth of 400 Hz, based on commercially available polarization-maintaining large-mode-area fiber. To the best of our knowledge, this represents the highest output power achieved for sub-kHz linewidth systems using commercial fibers. The amplifier maintains near-diffraction-limited beam quality with a beam quality factor M 2 of 1.16 and a polarization extinction ratio exceeding 18.3 dB. Built on a master oscillator power amplifier architecture, the system incorporates segmented thermal management to suppress thermally induced mode instabilities and employs minimal fiber length to mitigate stimulated Brillouin scattering. The optical signal-to-noise ratio remains above 65.6 dB across the full power range. The demonstrated all-fiber amplifier combines high power, sub-kHz linewidth, and high polarization purity with long-term stability, offering a compact and scalable platform that bridges laboratory demonstrations and industrial applications such as coherent beam combining and optical metrology.
Source: Optics Express
DOI: 10.1364/oe.584389
Authors: Ye Yuan, Yuxin Sun, Litao Xu, Qilai Zhao, Changsheng Yang, Shanhui Xu
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,270
OpenAlex ID: W7117565719