By V. M. Akulin, N. V. Karlov (auth.)
This e-book is a process lectures given for senior scholars on the Moscow Institute of Physics and expertise. should you have graduated within the USSR this data may still beisufficient to provide an idea of the extent and the way during which the subject material is gifted. nevertheless, readers outdoor of this nation may well 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 know-how (MFTI or Fiztekh) was once based in 1947 because the results of a different directive of Stalin on the way to provide the distance and nuclear software with hugely expert specialists. the easiest scientists within the kingdom have been concerned with the basis procedure. They invented a good and versatile academic method that incorporates easy schooling accord ing to an collage application by means of specialization at lead ing clinical facilities. Being geared up firstly as a division of Moscow kingdom collage, MFTI lately separated into an inde pendent establishment. within the sixties it misplaced its typically best mystery and armed forces personality and have become the main prestigious position within the state for an schooling in physics. The political alterations of the previous few 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 encompasses a major a part of the Ph. D.
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Sample text
E. the 47r-pulse will break into two 27r-pulses, the 67r-pulse, into three 27r-pulses, etc. Somewhat special is the so-called 07r-pulse. The area under it equals zero (Fig. 3). Such a pulse may be formed only if in the course of its duration the field amplitude passes the zero value, while its phase jumps up by 7r. In fact, such a 07r-pulse is equivalent to several closely spaced pulses. The evolution of such an intense pulse propagating in a resonant medium is rather complicated and its analytic study is fairly cumbersome.
41) at A = v. The envelope of the obtained automodel pulse has a symmetric bell shape (Fig. 2). L21 £(¢) = 8vv-sech¢. L21 h(z - vt) 27rNIiw v(c-v) 1. 46) while propagating. 42) describes the 27r-pulse, since O( +00) -O( -00) = 27r. Hence, it is the 27r-pulse that propagates in the medium without damping and, finally, acquires the hyperbolic secant shape. The propagation velocity depends on the pulse intensity. The propagation of radiation pulses without damping results in the effect called self-induced transparency.
However, the spread in eigenfrequencies leading to a distribution of frequency detunings with an effective width of Llo in the absence of a field brings about complete unphasing in the time interval of the order of Ll 01 . In the time interval 7, the relative phase shift for the particles with their eigenfrequencies separated from the distribution center by the distance Ll equals Ll7 and is different for the particles with different 22 Lecture Three. d. Such an unphasing of dipole oscillations brings about the loss of coherence in the particle ensemble, thus terminating the process of coherent dipole radiation of the whole system in a time that is small against the longitudinal and the transverse relaxation times.