We report on the observation of periodic modulations in the second-order photon correlation of single-mode vertical-cavity surface-emitting lasers (VCSELs) in steady-state operations. We realized the fast photon correlation measurement of VCSELs by using a streak camera operated in a photon-counting mode. Fast modulation signals were observed in second-order photon correlations at and around the threshold.The calculations using photon rate equations that include a gain medium dynamics shows that the oscillating signals originate from relaxation oscillations.
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Takemura et al. (2012) studied this question.
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