Abstract

We report an actively Q-switched all-fiber laser based on magnetostriction modulation of a Bragg grating. The laser employs a pair of Bragg gratings as reflective mirrors, one of which is bonded to a magnetostrictive element. Lengthening of the magnetostrictive element when a magnetic field is applied shifts the Bragg wavelength of the grating, allowing control of the Q-factor of the cavity and, thus, performing active Q-switching. The magnetostrictive modulator is small, compact and requires less than 300 mW electrical drive power. Using erbium-doped fiber and a maximum pump power of 120 mW, Q-switch pulses of more than 1 W peak power were obtained, with a pulse repetition rate that can be continuously varied from 1 Hz to 125 kHz.

© 2005 Optical Society of America

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Appl. Opt.

Electron. Lett.

J.L. Cruz, A. Díez, M.V. Andrés, A. Segura, B. Ortega y L. Dong, "Fibre Bragg gratings tuned and chirped using magnetic fields," Electron. Lett. 33, 235-236 (1997).
[CrossRef]

H. H. Kee, G. P. Lees and T. P. Newson, �??Narrow linewidth CW and Q-switched erbium-doped fibre loop laser,�?? Electron. Lett. 34, 1318-1319 (1998).
[CrossRef]

IEEE Photon. Technol. Lett.

V. N. Philippov, A. V. Kiryanov and S. Unger, �??Advanced configuration of erbium fiber passively Q-switched laser with Co2+:ZnSe crystal as saturable absorber,�?? IEEE Photon. Technol. Lett. 16, 57-59 (2004).
[CrossRef]

D. W. Huang, W. F. Liu and C. C. Yang, �??Q-switched all-fiber laser with an acoustically modulated fiber attenuator,�?? IEEE Photon. Technol. Lett. 12, 1153-1155 (2000).
[CrossRef]

J. Lightwave Technol.

V. Mizrahi, D. J. DiGiovanni, R. M. Atkins, S. G. Grubb, Y. K. Park and M. P. Delavaux, �??Stable single-mode erbium fiber-grating laser for digital communication,�?? J. Lightwave Technol. 11, 2021-2025 (1993).
[CrossRef]

Opt. Comm.

N. A. Russo, R. Duchowicz, J. Mora, J. L. Cruz and M. V. Andrés, �??High-efficiency Q-switched erbium fiber laser using a Bragg grating-based modulator,�?? Opt. Comm. 210, 361-366 (2002).
[CrossRef]

Opt. Commun.

L. Luo and P.L. Chu, �??Passive Q-switched erbium-doped fibre laser with saturable absorber,�?? Opt. Commun. 161, 257-263 (1999).
[CrossRef]

Opt. Eng.

A. Chandonnet and G. Larose, �??High-power Q-switched erbium fiber laser using an all-fiber intensity modulator,�?? Opt. Eng. 32, 2031-2035 (1993).
[CrossRef]

Opt. Lett.

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Figures (4)

Fig. 1.
Fig. 1.

Q-switched all-fiber laser arrangement. MM: magnetostrictive modulator, MT: magnetostrictive transducer.

Fig. 2.
Fig. 2.

(left) Time response of the magnetostrictive modulator when the current is switched on (a) and switched off (b). (right) Q-switch laser pulse emitted when the reflection band of the FBGs overlap as the current is switched on (c) and switched off (d). The current applied to the coil is also plotted in all cases (dashed line).

Fig 3.
Fig 3.

(a) Pulse shape for a 15 mW pump power and 1 kHz pulse repetition rate. (b) Laser output when operating at 125 kHz (solid line) and current applied to the magnetic coil (dashed line).

Fig 4.
Fig 4.

(a) Optical peak power versus continuous pump power for several pulse repetition frequencies. (b) Pulse width against pulse repetition frequency when pumping at 76 mW.

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