By M. S. Feld, V. S. Letokhov (auth.), Professor Michael S. Feld Phd, Professor Vladilen S. Letokhov (eds.)
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Additional info for Coherent Nonlinear Optics: Recent Advances
A second condition on relaxation processes can often be more restrictive. The homogeneous decay time T1 , due to spontaneous emission, collisions, and other mechanisms, must not be so short that incoherent decay becomes the dominant mode of deexcitation, which would prevent superradiance. 66). 5]. 69). 2 Feedback (Assumption 10) The bas,ic features of superradiance are not changed by the presence of feedback. However, the details of the radiation process may be modified. In particular, the delay time decreases and the amount of ringing increases.
Their solution is then formally identical to that of the linearized semiclassical Maxwell-Schrodinger equations. Furthermore, once the atomic polarization becomes large compared to its initial fluctuations, the behavior of the system becomes completely semiclassical. 3, this occurs after a few TR, and long before nonlinear behavior due to decreasing inversion density sets in. Based on these considerations, Polder, Schuurmans and Vrehen developed a stochastic variable description to model the pulse evolution process, considering the initiating fluctuations as arising from a classical fluctuating field source.
62] to study the effects of non-plane wav~ behavior on the propagation of coherent pulses in absorbers. The following discussions explore experimental circumstances for which non-plane wave effects may be important. I) Snall Fresnel NUmber. 1), which is valid for large Fresnel number ("disc"). This can be visualized by noting that for a long thin array of radiators, the solid 37 angle over which phases sum constructively is very different from that of a short flat array. 5]. 74) For L> L3 , TR remains constant as the length increases.
Coherent Nonlinear Optics: Recent Advances by M. S. Feld, V. S. Letokhov (auth.), Professor Michael S. Feld Phd, Professor Vladilen S. Letokhov (eds.)