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Abstract
We experimentally investigate inphase and antiphase dynamics of spatially-resolved light intensities in a chaotic broad-area semiconductor laser. We resolve partial intensities from the near-field pattern of the laser beam to observe phase dynamics. We calculate the sum of the radio frequency (RF) spectra of the partial intensities and compared it with the RF spectrum of the total intensity in order to determine the phase relationship. inphase dynamics is observed at low- and high-frequency components, where the low-frequency components include the relaxation oscillation frequency. On the contrary, antiphase dynamics is observed at intermediate frequency components.
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