Mode Locking of an All-Fiber Laser by Acousto-Optic Superlattice Modulation

Departamento de Física Aplicada y Electromagnetismo, ICMUV, Universidad de Valencia, Valencia, Spain.
Optics Letters (Impact Factor: 3.29). 05/2009; 34(7):1111-3. DOI: 10.1364/OL.34.001111
Source: PubMed


Active mode locking of an erbium-doped all-fiber laser with a Bragg-grating-based acousto-optic modulator is demonstrated. The fiber Bragg grating was acoustically modulated by a standing longitudinal elastic wave, which periodically modulates the sidebands at twice the acoustic frequency. The laser has a Fabry-Perot configuration in which cavity loss modulation is achieved by tuning the output fiber Bragg grating to one of the acoustically induced sidebands. Optical pulses at 9 MHz repetition rate, 120 mW peak power, and 780 ps temporal width were obtained. The output results to be stable and has a timing jitter below 40 ps. The measured linewidth, 2.8 pm, demonstrates that these pulses are transform limited.

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Available from: Christian Cuadrado-Laborde, Oct 08, 2015
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    • "As expected, the amplitude modulation is at the same frequency of the electrical signal used to drive the piezoelectric. On the other hand, when standing acoustic waves are used −by clamping the end of the FBG opposite to the silica horn− the sidebands raise and fall at twice the frequency of the electrical signal (Cuadrado-Laborde et al., 2009a). Further, in principle, for a perfect acoustical reflection, the light reflected by the sidebands does not experiment any Doppler shift, as opposed to the previous case when travelling acoustic waves are used. "
    Acoustic Waves - From Microdevices to Helioseismology, 11/2011; , ISBN: 978-953-307-572-3
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    ABSTRACT: This work presents a short review of the current research on the acousto-optic mechanism applied to optical fibers. The role of the piezoelectric element and the acousto-optic modulator in the excitation of flexural and longitudinal acoustic modes in the frequency range up to 1.2 MHz is highlighted. A combination of the finite elements and the transfer matrix methods is used to simulate the interaction of the waves with Bragg and long period gratings. Results show a very good agreement with experimental data. Recent applications such as the writing of gratings under the acoustic excitation and a novel viscometer sensor based on the acousto-optic mechanism are discussed.
    Photonic Sensors 03/2013; 3(1). DOI:10.1007/s13320-013-0100-0
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    ABSTRACT: 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.
    Optics Letters 09/2009; 34(18):2709-11. DOI:10.1364/OL.34.002709 · 3.29 Impact Factor
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