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We made pulse-resolved observations of subharmonic oscillations in the pulse train of a Kerr-lens mode-locked Ti:sapphire laser. Pulse-resolved beam profiles demonstrate that these oscillations, which include period doubling as well as P3, P4, and quasi periodicity, are accompanied by spatial modulation of the beam. A pulse-resolved autocorrelation technique believed to be novel is used to show that temporal pulse reshaping does not accompany these dynamics. The power dependence of subharmonic oscillation frequencies exhibits the frequency locking characteristic of nonlinear dynamics in systems of coupled oscillators.
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Bolton et al. (1999) studied this question.
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