Abstract
Squeezed light provides the opportunity for enhanced sensitivity in spectroscopy and for the measurement of nondassical optical interactions, as shown in recent experiments.1 Because photon-number fluctuations are easily measured by photosensitive devices, methods have been developed to use this information to control the amplitude fluctuations in a laser.2 Significant noise reduction [up to 20 dB (Ref. 3)] below the standard quantum limit (SQL) has been observed in the amplitude fluctuations of light when the photocurrent is fed back to the laser source.
© 1995 Optical Society of America
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