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,
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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. "

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