The passive Q-switching operation in a laser with a saturable absorber consists of an operation with high-intensity spikes in the output power. It is known that this particular regime corresponds mathematically to a large-amplitude time-periodic solution of the laser equations. In this paper we propose a new asymptotic method to construct this solution. We show how the time-periodic solution appears from an infinite-period solution (homo-clinic solution) and analyze the behavior of the maximum intensity and the period as a function of a control parameter. This asymptotic method is based on a recent evaluation of the parameters for CO2 lasers with different absorbers [ E. Arimondo, F. Casagrande, L. A. Lugiato, and P. Glorieux, Appl. Phys. B 30, 57 ( 1983)]. The relative magnitudes obtained by Arimondo et al. suggest a new approximation of the laser equations.
© 1988 Optical Society of AmericaFull Article | PDF Article
E. Arimondo, P. Bootz, P. Glorieux, and E. Menchi
J. Opt. Soc. Am. B 2(1) 193-201 (1985)
E. Arimondo, D. Dangoisse, C. Gabbanini, E. Menchi, and F. Papoff
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