Abstract
The control of the quantum state of light has recently been studied extensively, aiming at the achievement of ultra-low noise below the shot-noise limit. Yamamoto and Machida showed that the amplitude squeezing, that is, the intensity noise reduction below the shot-noise limit, could be achieved in constant-current-driven semiconductor lasers [1]. The semiconductor- laser noise consists of the three kinds of noise: the intrinsic noise due to the output coupling, the excess noise due to the internal loss, and the spontaneous emission noise. The first and second noises are below the shot-noise level, whereas the spontaneous emission noise is usually comparable with or even larger than the shot noise, making it difficult to achieve efficient amplitude squeezing.
© 1994 Optical Society of America
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