High Power Laser Science and Engineering, 2018, 6 (3): 03000e42, Published Online: Aug. 28, 2018  

Monolithic high-average-power linearly polarized nanosecond pulsed fiber laser with near-diffraction-limited beam quality Download: 608次

Author Affiliations
1 College of Optoelectronic Science and Engineering, National University of Defense Technology, Changsha 410073, China
2 Hunan Provincial Collaborative Innovation Center of High Power Fiber Laser, Changsha 410073, China
Abstract
An all-fiberized high-average-power narrow linewidth ns pulsed laser with linear polarization is demonstrated. The laser system utilizes a typical master oscillator power amplifier (MOPA) configuration. The stimulated Brillouin scattering (SBS) is effectively suppressed due to the short fiber length and large mode area in the main amplifier, combined with the narrow pulse duration smaller than the phonon lifetime of SBS effect. A maximal output power of 466 W is obtained with a narrow linewidth of 203.6 MHz, and the corresponding slope efficiency is 80.3%. The pulse duration is condensed to be 4 ns after the amplification, corresponding to the peak power of 8.8 kW and the pulse energy of . Near-diffraction-limited beam quality with an factor of 1.32 is obtained at the output power of 442 W and the mode instability (MI) is observed at the maximal output power. To the best of our knowledge, this is the highest average output power of the all-fiberized narrow linewidth ns pulsed fiber laser with linear polarization and high beam quality, which is a promising source for the nonlinear frequency conversion, laser lidar, and so on.

Long Huang, Pengfei Ma, Daren Meng, Lei Li, Rumao Tao, Rongtao Su, Yanxing Ma, Pu Zhou. Monolithic high-average-power linearly polarized nanosecond pulsed fiber laser with near-diffraction-limited beam quality[J]. High Power Laser Science and Engineering, 2018, 6(3): 03000e42.

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