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【资源】[PDF]Fundamentals of Laser Dynamics.Ya I Khanin.Cambridge.2006[New]
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Fundamentals of Laser Dynamics 本资源来自于互联网，仅供学习研究之用，不可涉及任何商业用途，请在下载后24小时内删除。 著作权归原作者或出版社所有。未经发贴人conanwj许可，严禁任何人以任何形式转贴本文，违者必究！ Authors Ya I Khanin Publisher:Cambridge International Science Publishing Ltd Pub Date: 2006 Pages: 376 ISBN 1-904602-11-8 Preface The resonant interaction of the atomic system with the radiation field is the main member of the functional circuit of the laser. The redistribution of the population of the energy levels of the medium, accompanying this interaction, indicates the principle of the unremovable nonlinearity of the system. The lasing process is also affected by other nonlinearities, if they are typical of the media located inside the laser cavity. The nature of the processes may change as a result of the external effects, accompanying the variation of the laser parameters with time. Examination of the role of interactions and effects of this type and also their influence on the time, spatial and spectral characteristics of laser radiation and the justification of practical methods of controlling the lasing process are the subjects of tasks in laser dynamics. In the history of laser dynamics, which is now more than 30 years old, there are two periods of the most rapid advances. The considerable interest in the problems of dynamics arose with the construction of the first solid-state lasers. This interest was stimulated by the fact that the experimentally detected spike nature of lasing could not be satisfactorily explained. The universal nature of the spike regime and of the absence of visible reasons for the occurrence of this regime may have indicated that the non-stationarity is the only property of the process of induced radiation of condensed active media in the cavity. Therefore, in the initial investigations, special attention was given to determining the possible mechanisms of the instability of this process. The first period, which included the 60s of the previous century, was extremely fruitful for laser dynamics. The basic models were formulated, their properties were investigated in general features, investigations were carried out into the conditions of free lasing, active and passive modulation of the Q-factor of the laser, and the fundamentals of the theory of formation of giant pulses and mode synchronisation were laid. Using the well-known definition of radiophysics, proposed by S.M. Rytov (in the preface to his book, Introduction into statistical radiophysics, Nauka, Moscow, 1966, S.M. Rytov subdivided radiophysics to ‘physics for radio’ and ‘radio for physics’), this period may be regarded as ‘physics for lasers’. This period ended at the start of the 70s when it was established that the spike regimes of solid-state lasers are formed mainly by technical fluctuations of the parameters, and other problems of this type were solved. The 70s were not marked by any significant achievements in laser dynamics. The individual ‘grey areas’ remained but it appeared that their number was smaller. For example, the regime of non-attenuating coherent pulsations of the single-mode laser, which was mentioned many times by the theoreticians, could not be realised. Doubts remained regarding the true reasons for the irregular nature of spike lasing. Only a small amount of work was carried out in the low-frequency dynamics of multi-mode lasers. Nevertheless, it appeared that these are only small fragments and no significant achievements were expected in laser dynamics. However, these years were marked by the rapid progress in the theory of nonlinear oscillations (nonlinear dynamics, as it is called now). The scientific practice included concepts such as determined chaos and strange attractor. The new concepts of nonlinear dynamics had a significant effect on developments in greatly differing areas of science. In this period, it was found that the laser belongs to the group of systems which are capable not only of demonstrating complicated behaviour but are also greatly suitable for the examination of general relationships of nonlinear dynamics. This led to a new and rapid progress in the dynamics of lasers, which started in the 80s and took place, in contrast to the first period, under the name ‘Lasers for physics!’. The renewed attention paid to the possibilities of examination of the determined chaos in lasers resulted in the first experimental successes in 1982. Now, we have a large amount of original literature on the subject, including both experimental and theoretical investigations of complicated lasing regimes. This aspect of laser dynamics was described in the book Dynamics of Lasers, by C. Weiss and R. Vilaseca, Weinheim, New York, 1991. However, the number of monographs on laser dynamics was smaller. They all were published in the period to the 80s and were written in most cases by Soviet authors. The latter cannot be regarded as surprising because the contribution of Soviet authors to laser dynamics was significant. In this connection, it is important to mention the monograph Molecular Generators by A.N. Opaevskii (Nauka, Moscow, 1964), the book by K.G. Folin and A.V. Gainer Dynamics of free lasing of solid-state lasers (Nauka, Novosibirsk, 1979), the book Dynamics of radiation of semiconductor quantum generators by L.A. Rivlin, and the book Dynamics and emission spectra of semiconductor lasers, by L.A. Rivlin, et al (Radio i svyaz’, Moscow, 1983). This list should be supplemented by a later monograph Self-oscillations in lasers, by A.M. Samson et al (Nauka i tekhnika, Minsk, 1990). In each book special attention is given to the specific type of laser or specific operating regime. A significant contribution to the dynamic theory of lasers by the wellknown German physicist H. Haken has been reflected in his monograph Laser light dynamics published in the West in 1985 (Amsterdam, North Holland). A list of foreign publications on the subject was supplemented in 1997 by the book ‘Theoretical problems in cavity nonlinear optics (Cambridge: Cambridge University press). The attempts for systematization of the material on the subject and explanation of the general situation were explained in the monograph by the author of the present book, Dynamics of quantum generators. However, events requiring that attention be paid to different subjects occurred with time. The true position of a number of studies, which were previously disregarded, was found. The positions of other studies, on the other hand, proved to be less important than previously thought. Therefore, retaining this material from the book Dynamics of quantum generators which withstood the test of time, the author of the present book published a new book under the name Principles of laser dynamics. The book was published in 1995 (Amsterdam: North Holland). Russian readers could not obtain this book because of the extremely high price and inefficient advertising. In this monograph, the free lasing of lasers in different conditions is examined in detail. In the chapters, concerned with the subject (chapters 3 to 5), special attention is given to the stationary states and their stability, the behaviour of lasers in the unstable region, the characteristics of regular and random self-modulation processes and the nature of mechanisms responsible for them. The processes in the lasers, accompanying changes of the parameters with time, are the subject of chapter 6. Special attention is given to the response of the laser to low-intensity low-frequency modulation of the parameters. Problems of the resonant amplification of modulation, transition to the nonlinear regime, random response to the periodic effect, spike lasing under the effect of changing geometry of the cavity and the drift of temperature of the active element are studied. The behaviour of the laser may change quantitatively if its optical elements show nonlinear properties. More detailed investigations have been carried out into the effect of a saturated absorber, leading to the instability of stationary lasing and ensuring, in specific conditions, the passive modulation of the Q-factor of the resonator. Less attention has been paid to the effect, on the processes in the laser, of other nonlinear effects, in particular self-focusing, which is also capable of having a strong effect on lasing dynamics. All this is discussed in chapter 7 of the book. The five main chapters are preceded by two chapters of introductory nature. In one of the chapters, essential information is given on quantum generators, requirements are formulated on the main elements of the laser, and the extent to which these requirements are fulfilled in the generators of different types is shown. The information on the types of dynamic behaviour of lasers in relation to the ratio between the parameters is also provided. In the second introductory chapter, the most general mathematical models, used in the semiclassical laser theory are presented. Discussion of idealisations and simplifications, used in different specific situations, and also the ranges of the applicability are transferred to the chapters in which the specific models are analysed. It is assumed that the reader is acquainted with the main considerations of the modern theory of nonlinear fluctuations. It is necessary, this information may be found in, from various books and other sources, presented in the literature list. In this connection, it is again necessary to mention the monograph by C. Weiss and R. Vilaseca. It is also important to mention the sections of laser dynamics which for some reasons have not been reflected in this monograph. For example, no mention is made of the concepts relating to the time evolution of the spatial structures in the laser emission field. The section of nonlinear dynamics of the optical systems is being developed. The author decided not to include in the monograph the material on different methods of lasing of the giant pulses because no significant changes have been made in this area of quantum electronics from the date of publication of his previous book. This may also be said of the theory of sweep lasers. Finally, it is important to also mention inverse problems of laser dynamics. This larger area of activity must be mentioned, but only small parts have been developed. At the same time, the problem of extracting information on the laser parameters and individual intra-cavity elements are of considerable practical importance and, in this case, special use is made of new concepts based on the advanced concepts of nonlinear dynamics. Evidently, it is clear to the reader that the book is a physical rather than mathematical version of the subject. This is justified by the fact that in this case we are not concerned with nonlinear dynamics in general but with laser dynamics, and this does not correspond to the scientific activity of the author. Laser dynamics is a rapidly developing science in which events take place very frequently. In these conditions it is obvious that the material in the book may not be complete and the situation will become worse with time. Nevertheless, the already existing system of ‘eternal values’ makes it possible to hope that the usefulness of the book will not decrease very rapidly. 本资源共8个可选网络硬盘链接，5.68 MB，保质期2009-08-30。 ---------------------------------------------------------------------------- Fundamentals of Laser Dynamics.Ya I Khanin.Cambridge.2006.pdf Fundamentals of Laser Dynamics.Ya I Khanin.Cambridge.2006.pdf Fundamentals of Laser Dynamics.Ya I Khanin.Cambridge.2006.pdf Fundamentals of Laser Dynamics.Ya I Khanin.Cambridge.2006.pdf Fundamentals of Laser Dynamics.Ya I Khanin.Cambridge.2006.pdf Fundamentals of Laser Dynamics.Ya I Khanin.Cambridge.2006.pdf Fundamentals of Laser Dynamics.Ya I Khanin.Cambridge.2006.pdf Fundamentals of Laser Dynamics.Ya I Khanin.Cambridge.2006.pdf ---------------------------------------------------------------------------- |
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