Abstract
We applied laser-diode sheetlike end pumping to a multimode laser and observed high-speed 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
Full Article | PDF ArticleMore Like This
Kenju Otsuka, Jing-Yuan Ko, Shin-ichi Higashihara, and Jyh-Long Chern
Opt. Lett. 26(8) 536-538 (2001)
Kenju Otsuka, Jing-Yuan Ko, Tamaki Kubota, Siao-Lung Hwong, Tsong-Shin Lim, Jyh-Long Chern, Ba An Nguyen, and Paul Mandel
Opt. Lett. 26(14) 1060-1062 (2001)
Tsong-Shin Lim, Jyh-Long Chern, and Kenju Otsuka
Opt. Lett. 27(24) 2197-2199 (2002)