By V. M. Akulin, N. V. Karlov (auth.)
This publication is a process lectures given for senior scholars on the Moscow Institute of Physics and expertise. in case you have graduated within the USSR this knowledge should still beisufficient to provide an idea of the extent and the style within which the subject material is gifted. however, readers outdoor of this kingdom may possibly by no means have heard approximately this recognized Sgviet establishment, and so we want to claim few phrases approximately it now. The Moscow Institute of Physics and expertise (MFTI or Fiztekh) was once based in 1947 because the results of a different directive of Stalin with a view to offer the distance and nuclear software with hugely knowledgeable specialists. the simplest scientists within the nation have been concerned about the root method. They invented a good and versatile academic process that incorporates uncomplicated schooling accord ing to an collage software by means of specialization at lead ing clinical facilities. Being geared up at the beginning as a division of Moscow nation college, MFTI lately separated into an inde pendent establishment. within the sixties it misplaced its generally best mystery and armed forces personality and have become the main prestigious position within the nation for an schooling in physics. The political alterations of the previous couple of years have opened it to contacts with different international locations. The process lectures comprising this ebook is devoted to the topic of the serious resonant interplay of laser radiation. with subject and features a major a part of the Ph. D.
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Line width and homogeneous broadening. Saturation effect. Field broadening. Dispersion relations. 7) and calculate the susceptibility of a two-level system with the relaxation times T1 and T 2 . 2) . 1)) where 0"12 = 0"21' In other words, as is often done in the theory of vibrations, we try the solution oscillating with the frequency of the driving external field. /-L21 E o + R11220"22) ' - 0"11) - . /-L21EO at = J----V;-(0"12 - at = J----V;-(0"22 0"2t) - . + J(W21 (R 2222 0"22 - W))0"12 ' + R 2211 0"11).
51 ) Lecture Three. Photon Echo and Self-Induced Transparency Phenomena 27 The delay, though increasing with the resonant particle density and the transition frequency, decreases with the growth of the resonant field intensity. 104 W/cm (Irn = 1 MW/cm 2) the value of (c - v) / c is about 5· 10- 7 . Note that the particle density of 3 . , ruby). So, the 27r-pulse in a resonant medium propagates with retardation, but without any damping or change in shape. After it has passed, the medium remains in its ground state.
For the diagonal elements of the density matrix, ignores the role of the off-diagonal elements. Hence, it cannot be used for the determination of the transition line width. 28) corresponds to the so-called homogeneous broadening. The latter notion has the following simple meaning. 18) for the polarization. 4) which describe an isolated atom (molecule) 48 Lecture Five. Susceptibility of a Two-Level System with relaxation times Tl and T 2 . 17) by the density of those particles supposed to be identical.