Investigation of parasitic stimulated emission in a nanosecond diode-seeded high gain fiber pre-amplifier

Chang, Chun-Lin; Li, Yen-Yin; Lai, Yi-Ping; Huang, Sheng‐Lung

doi:10.1109/iqec-cleo.2011.6193745

Cited by 1 publication

(1 citation statement)

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“…Figure 1 shows the layout of four-stage nanosecond ytterbium-doped fiber laser system based on an all-PM-fiber MOPA configuration. A 20-ns and 1064-nm square pulse train with the peak power of 1 W at 20 kHz is generated from a singlemode Fabry-Pérot pigtailed laser diode, and then injected into the core-pumped 6/125 preamplifier module with the input energy of 8-nJ free from the parasitic stimulated amplification [20]. The two-stage preamplifier module includes a doublepassed amplifier as the first stage using a 3-port circulator to scale up the energy more than 7 times higher than the same one using single passing.…”

Section: Introductionmentioning

confidence: 99%

Intense supercontinuum generation in a nanosecond nonlinear all-PM-fiber power amplifier

Chang

Lai

et al. 2014

SPIE Proceedings

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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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Section: Introductionmentioning

confidence: 99%