Abstract

Spontaneous generation of giant pulses was observed from a diode-pumped Nd:YVO4 laser with a plane-concave resonator by adjusting the cavity length near the hemispherical resonator configuration and misaligning the cavity axis with respect to the pump beam. Self-pulsation occurs because of the beating among near degenerate modes being tuned to resonate with the relaxation oscillation of laser modes. By using a concave mirror of 10-mm radius of curvature, giant pulses were obtained at approximately 10 kHz with pulse widths as short as 2.4 ns corresponding to an increase in the peak power of more than 4×104 times over the cw level.

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References

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Appl. Phys. Lett. (1)

I. Freund, �??Self-Q-switching in ruby lasers,�?? Appl. Phys. Lett. 12, 388-390 (1968).
[CrossRef]

IEEE J. Quantum Electron. (2)

L. G. DeShazer, A. W. Tucker, M. Birnbaum, and C. L. Fincher, �??CW and self-Q-switched laser operation of Nd: YVO4,�?? IEEE J. Quantum Electron. 11, D84-D84 (1975).
[CrossRef]

T. Kimura and K. Otsuka, �??Response of a CW Nd3+:YAG laser to sinusoidal cavity perturbations,�?? IEEE J. Quantum Electron. 6, 764-769 (1970).
[CrossRef]

J. Appl. Phys. (2)

H. G. Danielmeyer and F. W. Ostermayer, �??Diode-pump-modulated Nd:YAG laser,�?? J. Appl. Phys. 43, 2911-2913 (1972).
[CrossRef]

H. G. Danielmeyer, �??Low frequency dynamics of homogeneous 4 level cw laser,�?? J. Appl. Phys. 41, 4014-4018 (1970).
[CrossRef]

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

Jpn. J. Appl. Phys. (1)

K. Otsuka, H. Utsu, R. Kawai, K. Ohki, Y. Asakawa, S.-L. Hwong, J.-Y. Ko and J.-L. Chern, �??Self-induced spiking oscillations and associated instabilities in a laser-diode-pumped three-mode Nd:YVO4 laser,�?? Jpn. J. Appl. Phys. 38, L1025-L1028 (1999).

Opt. Express (1)

Opt. Lett. (2)

Proc. IEEE (1)

M. Birnbaum and C. L. Fincher, �??Self-Q-switched ND3+:YAG and ruby lasers,�?? Proc. IEEE 57, 804-805 (1969).

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Figures (5)

Fig. 1.
Fig. 1.

The laser average power measured as a function of the cavity length. The region in which giant pulses are generated is indicated by an ellipse.

Fig. 2.
Fig. 2.

Typical oscilloscope traces of spontaneous giant pulse generation from the Nd:YVO4 laser; trace (a) exhibits a time-expanded scale (10 µs) to show three pulses in a screen and trace (b) displays the waveform with the same time scale as (a) but its voltage scale (20 mV) is magnified by 10 times to observe subpulses

Fig. 3.
Fig. 3.

Oscilloscope traces of the giant pulse output from the Nd:YVO4 with 10-mm radius of curvature of concave mirror; trace (a) is the pulse train and trace (b) exhibits a time-expanded single pulse showing a 2.4-ns width (FWHM).

Fig. 4.
Fig. 4.

Mode beats as a function of the cavity length. The inset shows the power spectrum observed at the cavity length where the giant pulse can be excited.

Fig. 5.
Fig. 5.

(a) Power spectrum of the diode-pumped Nd: YVO4 laser, showing the relaxation oscillation (RO) and near-degenerate mode beating (3.6 MHz). (b) A power spectrum when the laser beat frequency (2 MHz) was adjusted so that it approached the relaxation-oscillation frequency (~800 kHz).

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