Atomes à I’Intérieur d’un Interféromètre Perot-Fabry
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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.