Proposal for generation of amplitude-squeezed light (ASL) from laser diodes with electronic feedback

It is generally believed that the amplitude fluctuations of a light beam initially in the coherent state cannot be squeezed below those of shot noise by the simple arrangement of a beamsplitter and a detector, the current from the detector being fed back to the light source or to a modulator. A simple semiclassical theory shows that arbitrary amounts of squeezing can in fact be obtained if a negative optical-conductance device such as a constant-voltage-driven (non-self-oscillating) laser diode is used in place of a conventional detector.