A technique based on the two-quantum photoeffect has been used to measure second-order intensity correlations, pulse shapes from a mode-locked argon ion laser, and time delays in the picosecond domain. Good agreement was obtained between the mode distribution computed from the intensity autocorrelation data and that observed with a scanning Fabry-Perot when the laser was run in the mode-locked condition. Additionally, the contrast ratios observed in both the mode-locked and free-running condition were in good agreement with a theory by Weber and Danielmeyer.
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Bennett et al. (1974) studied this question.
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