An examination has been made of the influence of pump noise within a procedure for targeting laser dynamics. Specific attention is given to targeting Q-switched class B lasers to stable and unstable periodic orbits by means of a choice of the relative phase of the modulation and the instant of laser switch-on. When the phase space of a loss-modulated class B laser includes an unstable period-one orbit and two stable (antiphased) period-two orbits, noise causes a separatrix crossing, which results in switching between the two period-two orbits over a wide range of relative phases. It is shown here that in the regular targeting case pump noise is less important than intensity noise. However, pump noise is found to be of paramount importance in the case in which two possible targeting phases of the modulation are nearly degenerate. In this case of heteroclinic tangency pump noise induces additional crossings, which act transversally to the separatrix already at the initial stage of transients. By means of highest- (Nth-) passage-time distributions, trends in the relative impact of intensity and pump noises during the turn-on process are demonstrated.
© 1998 Optical Society of America
(140.3470) Lasers and laser optics : Lasers, carbon dioxide
(140.3540) Lasers and laser optics : Lasers, Q-switched
(270.2500) Quantum optics : Fluctuations, relaxations, and noise
(270.3100) Quantum optics : Instabilities and chaos
A. Valle, S. I. Turovets, and K. A. Shore, "Impact of pump noise on the turn-on dynamics of a modulated class B laser in the period-doubling regime," J. Opt. Soc. Am. B 15, 979-988 (1998)