A Proposal for Quiet Photon Streams from Injection Lasers

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Abstract
A proposal is made to produce, from a nonlinear diode injection laser, a photon stream with potentially non-classical statistical behaviour. The term ‘quiet photon stream’ is suggested to avoid possible confusion with other types of state such as the two-photon coherent squeezed states that have been described elsewhere. However, it is possible to that the process does give rise to states of phase-sensitive noise. A new interpretation is offered for the production of such non-classical states in that an increased emission is followed by a correlated increase in the probability of absorption and vice versa with the correlation arising through non-linearities within the laser. Thus a feedback mechanism within the diode laser cavity is proposed which certainly leads to saturation of the laser output and may also, as tentatively proposed here, lead to a reduction in the variance of the photon output stream along with possible effects on the phase fluctuations.