We examine experimentally the consequence of frequency detuning an actively mode-locked external-cavity semiconductor laser from resonance. We observe a transition of the laser system from a periodic oscillation to a nonperiodic state with broadened spectral tones. By estimating the fractal dimension of the corresponding phase-space attractors, we show the presence of low-dimensional chaos. The route to chaos is a well-defined regime of three-frequency quasi-periodicity preceded by a two-frequency quasi-periodicity.
© 1993 Optical Society of America
B. C. Lam, A. L. Kellner, M. M. Sushchik, H. D. I. Abarbanel, and P. K. L. Yu, "Observation of chaotic instability in the active mode locking of a semiconductor laser," J. Opt. Soc. Am. B 10, 2065-2070 (1993)