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(a) and (b) show the waveforms of unstably and stably mode-locked pulse trains, respectively. A modulation frequency of about can be seen in the waveform of the unstably mode-locked pulses; (c) power stability of the unstable mode-locking operation. About 40% of the laser power was picked off by a beam splitter and measured at an interval of over ; (d) normalized interferometric autocorrelation curves of the unstably (blue) and stably (red) mode-locked pulses.
(a) Experimentally measured spectrum of SC generated by unstably (blue) and stably mode-locked pulses (red). (b) Calculated SC spectra: averaged spectrum of SC generated by a series of pulses with varying amplitudes (blue), spectrum of the SC generated by a single pulse (red).
CARS spectrum of an optically trapped polystyrene sphere (diameter of ). The smoothed SC was used as Stokes beam. For comparison, spontaneous Raman spectrum of the sphere is also shown. The normalized CARS spectrum was shifted up by an arbitrary value for clarity of the figure.
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