Abstract

The stability and the peak power of a nonlinear-mirror mode-locked Nd:YVO4 laser are significantly increased by the insertion of an acousto-optic modulator inside the laser cavity. The repetition rate for reliable operation can be varied in the range 35 kHz–50 kHz. The laser generates the most intense and stable mode-locked pulses of width 9 ps lying underneath a Q-switched envelope of width 110 ns with a Q-switch modulation frequency of 38 kHz. For 10 W of pump power, a 224 times enhancement of peak power over that of cw mode-locking is obtained under reliable Q-switched and mode-locked operation.

© 2004 Optical Society of America

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References

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Appl. Opt. (1)

Appl. Phys. B (1)

K. A. Stankov, �??A mirror with a intensity dependent reflection coefficient,�?? Appl. Phys. B 45, 191-195 (1988).
[CrossRef]

Appl. Phys. Lett. (2)

A. A. Mani, Ph. Hollander, P. A. Thiry and A. Peremans, �??All solid state 12 ps actively passively mode-locked pulsed Nd:YAG laser using a nonlinear mirror,�?? Appl. Phys. Lett. 75, 3066-3068 (1999).
[CrossRef]

G. Cerullo, M.B. Danailov, S. De Silvestri, P. Laporta, V. Magni, D. Segala, and S. Taccheo, �??A diode pumped nonlinear mirror mode-locked Nd:YAG laser,�?? Appl. Phys. Lett. 65, 2392-2394 (1994).
[CrossRef]

J. Opt. Soc. Am. B (2)

Opt. Commun. (1)

P. K Datta, S. Mukhopadhyay and A. Agnesi, �??Stability regime study of a nonlinear mirror mode-locked laser,�?? Opt. Commun. 230, 411-418 (2004).
[CrossRef]

Opt. Lett. (2)

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Figures (5)

Fig. 1.
Fig. 1.

Laser layout: LDA, laser diode array; L1 and L2 focusing lenses; RM, rear mirror; AOQS, acousto-optic Q-switch; M1 and M2, folding mirrors; NLC, nonlinear crystal; DOC, dichroic output coupler.

Fig. 2.
Fig. 2.

QML pulse trains in longer time scale (a) when active Q-switch is on and (b) when it is off

Fig. 3.
Fig. 3.

Oscilloscope trace of a QML pulse train with active Q-switch on.

Fig. 4.
Fig. 4.

Pulse autocorrelation trace. Dots: experimental data. Continuous line: Gaussian fit.

Fig. 5.
Fig. 5.

Variation of Q-switch pulse width and average output power with repetition rate

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