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Optics Letters

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  • Vol. 27, Iss. 19 — Oct. 1, 2002
  • pp: 1696–1698

Self-induced high-speed modulation in microchip solid-state lasers with asymmetric end pumping

Kenju Otsuka, Tsong-Shin Lim, Jing-Yuan Ko, and Hironori Makino  »View Author Affiliations


Optics Letters, Vol. 27, Issue 19, pp. 1696-1698 (2002)
http://dx.doi.org/10.1364/OL.27.001696


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Abstract

We applied laser-diode sheetlike end pumping to a multimode Nd:YVO<sub>4</sub> laser and observed high-speed (>400-MHz) modulation of the intensity of chaotic pulsation near 1 MHz. The frequencies of modulation were the beat frequencies for pairs of closely spaced lasing modes. Asymmetric optical confinement and the resultant modal interference are shown to lead to oval-hollow-mode operation in which modal beat notes induce high-speed modulation, the frequency range of which is 2 orders of magnitude higher than the intrinsic relaxation oscillation frequency. Good numerical reproduction of the observed chaotic pulsations and their high-speed modulation was obtained with model equations in which such effects as nonlinear gain coupling among modes and field interference between pairs of modes were included. High-speed pulsations in nonchaotic lasers were also demonstrated.

© 2002 Optical Society of America

OCIS Codes
(140.3480) Lasers and laser optics : Lasers, diode-pumped
(140.3580) Lasers and laser optics : Lasers, solid-state
(190.3100) Nonlinear optics : Instabilities and chaos

Citation
Kenju Otsuka, Tsong-Shin Lim, Jing-Yuan Ko, and Hironori Makino, "Self-induced high-speed modulation in microchip solid-state lasers with asymmetric end pumping," Opt. Lett. 27, 1696-1698 (2002)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-27-19-1696

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