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Opt Lett. 2009 Sep 15;34(18):2709-11. doi: 10.1364/OL.34.002709.

Doubly active Q switching and mode locking of an all-fiber laser.

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Departamento de Física Aplicada y Electromagnetismo, Institut Universitari de Cièncìa dels Materials,Universidad de Valencia, C/ Dr. Moliner 50, Burjassot 46100, Valencia, Spain.


Simultaneous and independent active Q switching and active mode locking of an erbium-doped fiber laser is demonstrated using all-fiber modulation techniques. A magnetostrictive rod attached to the output fiber Bragg grating modulates the Q factor of the Fabry-Perot cavity, whereas active mode locking is achieved by amplitude modulation with a Bragg-grating-based acousto-optic device. Fully modulated Q-switched mode-locked trains of optical pulses were obtained for a wide range of pump powers and repetition rates. For a Q-switched repetition rate of 500 Hz and a pump power of 100 mW, the laser generates trains of 12-14 mode-locked pulses of about 1 ns each, within an envelope of 550 ns, an overall energy of 0.65 microJ, and a peak power higher than 250 W for the central pulses of the train.


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