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Q-switching of an all-fiber laser by acousto-optic modulation of a fiber Bragg grating

M. Delgado-Pinar, D. Zalvidea, A. Díez, P. Pérez-Millán, and M. V. Andrés

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Abstract

We report active Q-switching of an all-fiber laser using a Bragg grating based acousto-optic modulator. Q-switching is performed by modulating a fiber Bragg grating with an extensional acoustic wave. The acoustic wave modulates periodically the effective index profile of the FBG and changes its reflection features. This allows controlling the Q-factor of the cavity. Using 1 m of 300 ppm erbium-doped fiber and a maximum pump power of 180 mW, Q-switch pulses of 10 W of peak power and 82 ns wide were generated. The pulse repetition rate of the laser can be continuously varied from few Hz up to 62.5 kHz.

©2006 Optical Society of America

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Figures (7)
Fig. 1.
Fig. 1. The Bragg grating-based acousto-optic modulator.

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Fig. 2.
Fig. 2. (a) Reflection spectra for three different frequencies of the RF-signal and amplitudes (from top to bottom) of 4, 13 and 38 V. (b) Reflection spectra for three voltage amplitudes of the RF signal and a fixed frequency of 1.017 MHz. (c) Wavelength shift from the Bragg condition of the first-, second- and third-order sidebands, as a function of frequency. (d) Peak reflectivity of the central band (black) and first- (red), second- (blue) and third-order (green) sideband as a function of the RF voltage amplitude applied to the piezoelectric. The scale of vertical axis in (a) and (b) is linear.

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Fig. 3.
Fig. 3. Time response of the BG-AOM. (top) RF electric signal applied to the piezoelectric disk and (bottom) the optical signal reflected by one of the sidebands of the modulator.

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Fig. 4.
Fig. 4. The Q-switched all-fiber laser arrangement.

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Fig. 5.
Fig. 5. Laser emission spectra for three frequencies of the acoustic wave (blue). Spectrum when the RF generator was off and the output grating was tuned as in 1 MHz (red). The pump power in all cases was 180 mW. Inset: emission spectrum measured with resolution of 0.08 pm.

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Fig. 6.
Fig. 6. (a) Laser output when operating at 20 kHz (black). Rectangular electric signal used to modulate the RF signal (red). (b) Typical pulse shape, showing self-mode-locking

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Fig. 7.
Fig. 7. (a) Peak power and pulse width as a function of pump power. Repetition rate 1 kHz. (b) Peak power and pulse width as a function of repetition rate. Pump power 180 mW.

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