By M. S. Feld, V. S. Letokhov (auth.), Professor Michael S. Feld Phd, Professor Vladilen S. Letokhov (eds.)
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Extra info for Coherent Nonlinear Optics: Recent Advances
10). Typically, gains of the order of 20 are needed for strong superradiant emission to occur. 19) should be used for precise comparisons with experimental data, reliable analytical approximate solutions can be obtained in certain limiting cases. These results are useful in estimating relevant parameters and as an aid to understanding the underlying physical processes. One particularly 3The polarization can also be affected by level degeneracy effects. See the discussion of the experiments of Crubellier et al.
3). When loss is due to diffraction K is a function of x. 1. 4 become important. 66) is a necessary condition for ideal behavior. 1. 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.
57)]. This is so because the forward and backward waves only become sizable in the same region after much of the stored energy has been radiated. 4. 3) The plane wave approximation can be utilized. Thus, effects associated with finite beam diameter are neglected. 4. 19) can be used directly to obtain computer simulations of superradiant behavior for precise comparison with experimental data, computer simulations show that two additional simplifying Assumptions can almost always be made. 4. 19) by summing n over degenerate M states and averaging (~z)~ over orientations.