Abstract
Constant-current-driven diode lasers at high pumping often show noise (intensity noise) larger than the shot-noise contrary to the squeezing predicted by theory. Some researchers have speculated that the excess noise comes from the mode-partition noise that results from division of saturated gain into several different longitudinal modes.1 We, for the first time, we believe, have measured the mode-partition noise of the free-running as well as the injection-locked and external-cavity diode lasers using an interferometer. By comparing the mode-partition noise and the total noise in the three cases, we were able to demonstrate the relation between the two.
© 1997 Optical Society of America
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