Radiation noise of an active interferometer

William George Unruh

Sergei N Bagayev, A. A. Kurbatov, Е. А. Титов

An investigation is reported of the influence of quantum noise of amplifying and absorbing media in an active interferometer, excited by an external signal, on its output characteristics. The amplitude and the frequency of the external signal are assumed to be constant. A quantum description of the radiation emitted by an active interferometer is provided by a method involving the use of coherent states. A quantum kinetic equation is derived for the distribution function of the amplitude and phase of the field in an active interferometer and the corresponding diffusion coefficients are found. The variances of fluctuations of the energy of the field and its phase, and also the spectral densities of the fluctuations, are calculated.

Arnaud Landragin, J. Fils, F. Yver +3 more

D.Yu. Primakov, P.V. Pokasov, Sergei N Bagaev

The behaviour of the amplitude of a saturated absorption resonance observed in laser radiation propagated through an active interferometer with nonlinear amplifying and absorbing media is studied experimentally for the first time. Upon variation of the gain in the amplifying medium and preserving a constant saturating field in the interferometer, a nonlinear increase in the amplitude of the saturated absorption resonance was observed. In this case, an increase in the detected signal exceeded an increase in the noise, i.e., the signal-to-noise ratio also increased.

P.V. Pokasov, A. A. Kurbatov, D.Yu. Primakov +2 more

The investigation into the form of nonlinear optical resonances in an active Fabry-Perot interferometer with amplifying and absorbing media saturated by an external laser radiation was performed. Such an active interferometer may ensure an enhancement in the intensity of resonances by one order of magnitude as compared with a similar passive system.

V. Radhakrishnan