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16 April 2008 Mode-locked Yb-doped large-mode-area microstructure fiber laser
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Abstract
We report on an all-normal dispersion passively mode-locked fiber laser based on an ytterbium-doped largemode- area microstructure fiber and featuring high-energy ultra-short pulses. Mode-locking was achieved with a high modulation depth semiconductor saturable absorber mirror (SESAM). We investigate the influence of the modulation depth of the SESAM on the laser performances. We show that mode-locking could be achieved with a modulation of only 10 %. However, the best performances in term of pulse energy are obtained with the highest modulation depth (35 %). In this case, the laser delivers 3.3 W average output power with positively-chirped 5.5 ps pulses at a center wavelength of 1033 nm. The pulse repetition rate is 46.4 MHz, which results in an energy per pulse of 71 nJ. These pulses are extra-cavity de-chirped down to 516 fs using bulk gratings. The average power of the de-chirped pulses is 2.3 W, which corresponds to a peak power of more than 96 kW.
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C. Lecaplain, A. Hideur, C. Chédot, G. Martel, B. Ortaç, and J. Limpert "Mode-locked Yb-doped large-mode-area microstructure fiber laser", Proc. SPIE 6998, Solid State Lasers and Amplifiers III, 699809 (16 April 2008); https://doi.org/10.1117/12.781558
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