High Power Laser Science and Engineering, 2019, 7 (2): 02000e27, Published Online: Apr. 30, 2019   

High-peak-power temporally shaped nanosecond fiber laser immune to SPM-induced spectral broadening Download: 667次

Rongtao Su 1,2,3Pengfei Ma 1,2,3Pu Zhou 1,2,3,†Zilun Chen 1,2,3Xiaolin Wang 1,2,3Yanxing Ma 1,2,3Jian Wu 1,2,3Xiaojun Xu 1,2,3
Author Affiliations
1 College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China
2 State Key Laboratory of Pulsed Power Laser Technology, Changsha 410073, China
3 Hunan Provincial Key Laboratory of High Energy Laser Technology, Changsha 410073, China
Abstract
High-peak-power transform-limited narrow-linewidth nanosecond all-fiber lasers are desired in a range of applications. However, their linewidths will be broadened by self-phase modulation (SPM). We propose a novel concept that generates transform-limited laser pulses by temporally shaping the pulse seed. The impact of the pulse shape on SPM-induced spectral broadening was studied numerically and experimentally. It was found theoretically that the square-shape pulsed laser is immune to SPM-induced spectral broadening. Based on this principle, we built a high-peak-power, linearly polarized, square-shape nanosecond all-fiber laser in a master oscillator power amplifier (MOPA) configuration. Stimulated Brillouin scattering (SBS) limited peak powers of 4.02 kW, 5.06 kW, 6.52 kW and 9.30 kW were obtained at pulse widths of 8 ns, 7 ns, 6 ns and 5 ns. Thanks to the square-shape pulsed seed, the linewidths at maximum peak power remained at 129.5 MHz, 137.6 MHz, 156.2 MHz and 200.1 MHz, respectively, close to the transform-limited values of 110.8 MHz, 126.6 MHz, 147.7 MHz and 177.3 MHz.

Rongtao Su, Pengfei Ma, Pu Zhou, Zilun Chen, Xiaolin Wang, Yanxing Ma, Jian Wu, Xiaojun Xu. High-peak-power temporally shaped nanosecond fiber laser immune to SPM-induced spectral broadening[J]. High Power Laser Science and Engineering, 2019, 7(2): 02000e27.

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