Photonics Research, 2017, 5 (4): 04000350, Published Online: Jan. 21, 2019
Near-diffraction-limited linearly polarized narrow-linewidth random fiber laser with record kilowatt output Download: 982次
Lasers, distributed-feedback Fibers, polarization-maintaining Linewidth Fiber optics amplifiers and oscillators
Abstract
In this paper, we propose and experimentally investigate a linearly polarized narrow-linewidth random fiber laser (RFL) operating at 1080 nm and boost the output power to kilowatt level with near-diffraction-limited beam quality using a master oscillation power amplifier. The RFL based on a half-opened cavity, which is composed of a linearly polarized narrow-linewidth fiber Bragg grating and a 500 m piece of polarization-maintained Ge-doped fiber, generates a 0.71 W seed laser with an 88 pm full width at half-maximum (FWHM) linewidth and a 22.5 dB polarization extinction ratio (PER) for power scaling. A two-stage fiber amplifier enhances the seed laser to the maximal 1.01 kW with a PER value of 17 dB and a beam quality of and . No stimulated Brillouin scattering effect is observed at the ultimate power level, and the FWHM linewidth of the amplified random laser broadens linearly as a function of the output power with a coefficient of about . To the best of our knowledge, this is the first demonstration of a linearly polarized narrow-linewidth RFL with even kilowatt-level near-diffraction-limited output, and further performance scaling is ongoing.
Jiangming Xu, Long Huang, Man Jiang, Jun Ye, Pengfei Ma, Jinyong Leng, Jian Wu, Hanwei Zhang, Pu Zhou. Near-diffraction-limited linearly polarized narrow-linewidth random fiber laser with record kilowatt output[J]. Photonics Research, 2017, 5(4): 04000350.