We couple noise into the driving current of a laser diode to produce correlated light. We characterize the intensity correlations of the laser with two different techniques: two-detector photon coincidence and analysis of the photocurrent from a single detector. The light exhibits bunching with a magnitude and characteristic time set by the bandwidth and the amplitude of the noise modulating the laser driving current. A simple model based on amplitude modulation of the laser intensity agrees with the measured correlation functions. The bunched light can be used to probe systems that are sensitive to intensity correlations.
© 1998 Optical Society of America
(030.5260) Coherence and statistical optics : Photon counting
(030.5290) Coherence and statistical optics : Photon statistics
(140.2020) Lasers and laser optics : Diode lasers
(270.2500) Quantum optics : Fluctuations, relaxations, and noise
G. T. Foster, S. L. Mielke, and L. A. Orozco, "Intensity correlations of a noise-driven diode laser," J. Opt. Soc. Am. B 15, 2646-2653 (1998)