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arXiv:physics/0107038 · Journal of the Optical Society of America B

Optical decay from a Fabry–Perot cavity faster than the decay time

H. J. Rohde, Jürgen Eschner, Ferdinand Schmidt‐Kaler, R. Blatt

Published Jun 1, 2002• 28 citations
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Abstract

The dynamical response of an optical Fabry–Perot cavity is investigated experimentally. We observe oscillations in the transmitted and the reflected light intensity if the frequency of the incoupled light field is rapidly changed. In addition, the decay of a cavity-stored light field is accelerated if the phase and the intensity of the incoupled light are switched in an appropriate way. The theoretical model by M. J. Lawrence [J. Opt. Soc. Am. B16, 523 (1999)] agrees with our observations.

DOI
10.1364/josab.19.001425

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The dynamical response of an optical Fabry–Perot cavity is investigated experimentally. We observe oscillations in the transmitted and the reflected light intensity if the frequency of the incoupled light field is rapidly changed. In addition, the decay of a cavity-stored light field is accelerated if the phase and the intensity of the incoupled light are switched in an appropriate way. The theoretical model by M. J. Lawrence [J. Opt. Soc. Am. B16, 523 (1999)] agrees with our observations.
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We have studied theoretically and experimentally the dynamic behavior of a nonlinear Fabry-Perot interferrometer filled with a Kerr medium. The Fabry-Perot responses ranging from extremely transient to quasi-steady-state in various modes of operation are considered. The experimental results are in excellent agreement with theory. It is shown that the quasi-steady-state operation requires not only a medium response time much smaller than the cavity round-trip time, but also a characteristic time of the input intensity variation several hundred times larger than the cavity round-trip time. Even in the quasi-steady-state limit, optical switching is often featured by overshoot and ringing after switching. The switching speed is limited by the cavity buildup time.
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Experiments on the steady-state, nonlinear behavior of the 7F1^{7}\mathrm{F}_{1}7F1​${\mathrm{\ensuremath{-}}}^{7}$F0o{\mathrm{F}}_{0}^{\mathrm{o}}F0o​ 570.68-nm transition of atomic samarium in a laser-driven, near-concentric Fabry-Perot cavity are reported. For zero applied magnetic field, only simple optical bistability, symmetric in both ${\ensuremath{\sigma}}^{+}$ and ${\ensuremath{\sigma}}^{\mathrm{\ensuremath{-}}}$ transmitted polarizations, is observed for a linearly polarized excitation beam. However, for a magnetic field applied parallel to the propagation direction, polarization-sensitive switching appears, with lowest power threshold near the edge of the Doppler-broadened region. Subsidiary measurements of atomic parameters are also given to enable the transition to be experimentally well characterized.