12 March 2014 Intense supercontinuum generation in a nanosecond nonlinear all-PM-fiber power amplifier
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Abstract
Intense nanosecond emission with spectral broadening from 980 to 1600 nm was generated with peak power up to 117 kW, close to the damage threshold of fiber fuse. Both laser amplification and nonlinear conversion were simultaneously employed in a fiber power amplifier giving power scaling free from significant depletion. In a diode-seeded all-PM-fiber master oscillation power amplifier system under all normal dispersion, a core-pumped preamplifier using double-pass scheme can significantly improve the energy extraction. This produced the pulse energy of 1.2 mJ and duration of 6 ns with a conversion efficiency of 66% at the moderate repetition of 20 kHz, which is consistent with the coupled laser rate equations including the stimulated Raman scattering. For the comparable nonlinear strength in each stage from single to few modes, the onset and interplay of four kinds of fiber nonlinearities can be addressed.
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Chun-Lin Chang, Yen-Yin Lin, Po-Yen Lai, Yen-Yin Li, Dong-Yo Jheng, Shih-Hung Chen, Sheng-Lung Huang, "Intense supercontinuum generation in a nanosecond nonlinear all-PM-fiber power amplifier", Proc. SPIE 8961, Fiber Lasers XI: Technology, Systems, and Applications, 89612S (12 March 2014); doi: 10.1117/12.2037622; https://doi.org/10.1117/12.2037622
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