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Physical Review A

Input-output characteristics of a nonlinear Fabry-Perot system

Yoshio Nishiyama, Susumu Kurita

Published Oct 1, 1986• 2 citations
Publisher

Abstract

We study a Fabry-Perot system with a homogeneously broadened medium of active two-level atoms when monochromatic waves are incident on it from both sides. It is found that the ratio of output intensities at both sides depends on the relative phase between the bilateral incident waves and there are the cases when the output intensities are equal even if the bilateral inputs are different from each other. It is shown that completely absorbed states or emission states are attained for the light of special modes with proper intensity and for suitable population.

DOI
10.1103/physreva.34.3121

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Applied Optics•Jan 1, 1962•1 citation
We study a Fabry-Perot system with a homogeneously broadened medium of active two-level atoms when monochromatic waves are incident on it from both sides. It is found that the ratio of output intensities at both sides depends on the relative phase between the bilateral incident waves and there are the cases when the output intensities are equal even if the bilateral inputs are different from each other. It is shown that completely absorbed states or emission states are attained for the light of special modes with proper intensity and for suitable population.
The output characteristics of a stratified medium in the case of bilateral incidence of monochromatic light waves have been investigated. If the waves are incident in such a way as a single mode is standing in the medium, an asymmetry occurs in output intensities of both sides, even if the incident intensities are equal. For a medium with some values of the refractive and attenuation index, there can be a state in which both incident waves are completely absorbed. This is discussed in detail for the case of a Fabry–Perot cavity containing a linear optical medium.
In the optical masers realized so far a Perot-Fabry device is used as a multimode cavity. It may be interesting to investigate the general properties of such a device when the emitting or the absorbing atoms are put inside the reflecting mirrors. Even in the case when this device works below the threshold of maser action it shows remarkable properties which are worthwhile studying experimentally. The following aspects are considered in the paper: In the case of external illumination, the distribution of light intensity inside a Perot-Fabry interferometer is calculated. It is shown that the local light intensity in the stationary waves inside can be much higher than the intensity of the incident light beam. The properties of light emitted by atoms inside the Perot-Fabry and emerging from it are investigated. Narrow fringes of very strong intensity can be obtained. If the emitting atoms are located in an atomic beam the central fringe has natural line width, the Doppler broadening being suppressed. The realization of a fluorescent medium of lamellar structure is discussed. This structure favors one special mode of emission fringes. Finally, the absorption of atoms inside the interferometer is studied. It is shown that this device is equivalent to a long absorption path in an ordinary light beam.
In this paper we consider the nonlinear Fabry-Perot and its applications to optical signal and image processing. This paper addresses the signal processing aspects of a nonlinear Fabry-Perot interferometer with emphasis on image processing. The device geometry is shown in Figure 1. A thin nonlinear medium, whose refractive index is a function of the light intensity inside the Fabry-Perot is sandwiched between two plane parallel mirrors. The output as a function of input is shown in Fig. 2, for two different values of the difference between the Fabry-Perot low intensity resonance and the incident wavelength. The bistable curve in 2a is the origin of the term optical bistability and makes possible an optical memory, in which the output is a function of the history of the device. The Figure 2b represents a typical nonlinear transfer curve which may be used for signal processing. It can be seen that small changes in the input intensity Ic make large changes in the output intensity.
In the optical masers realized so far a Perot-Fabry device is used as a multimode cavity. It may be interesting to investigate the general properties of such a device when the emitting or the absorbing atoms are put inside the reflecting mirrors. Even in the case when this device works below the threshold of maser action it shows remarkable properties which are worthwhile studying experimentally. The following aspects are considered in the paper: In the case of external illumination, the distribution of light intensity inside a Perot-Fabry interferometer is calculated. It is shown that the local light intensity in the stationary waves inside can be much higher than the intensity of the incident light beam. The properties of light emitted by atoms inside the Perot-Fabry and emerging from it are investigated. Narrow fringes of very strong intensity can be obtained. If the emitting atoms are located in an atomic beam the central fringe has natural line width, the Doppler broadening being suppressed. The realization of a fluorescent medium of lamellar structure is discussed. This structure favors one special mode of emission fringes. Finally, the absorption of atoms inside the interferometer is studied. It is shown that this device is equivalent to a long absorption path in an ordinary light beam.