Nonclassical light from a semiconductor laser operating at 4 K

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Abstract
Amplitude fluctuations of the light from a semiconductor lase, operating 4 K, have been measured to be 11% below the shot-noise limit in the detected photocurrent. Weak optical reflection into the laser reduces the squeezing from the expected detector-current–to–laser-current transfer ratio of 25%. Results compare favorably with a theory which includes effects of optical feedback.