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Physics Bulletin

Microwave Solid State Masers

J D Craggs

Published Jul 1, 1964• 2 citations
Publisher

Abstract

By A. E. Siegman London: McGraw-Hill Publishing Co. Ltd. 1964. Pp. 582. Price 143s. 6d. This is a postgraduate book, partly for electronics engineers, who would find a good deal of the material difficult, because it is a comprehensive account of the subject which demands a good deal of familiarity with quantum mechanics. The contents include chapters on internal structure and energy levels of atoms, the magnetic properties of atoms, energy levels of paramagnetic maser materials, paramagnetic resonance and the dynamics of spin systems, the three level solid state maser and travelling wave maser.

DOI
10.1088/0031-9112/15/7/007

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By A. E. Siegman London: McGraw-Hill Publishing Co. Ltd. 1964. Pp. 582. Price 143s. 6d. This is a postgraduate book, partly for electronics engineers, who would find a good deal of the material difficult, because it is a comprehensive account of the subject which demands a good deal of familiarity with quantum mechanics. The contents include chapters on internal structure and energy levels of atoms, the magnetic properties of atoms, energy levels of paramagnetic maser materials, paramagnetic resonance and the dynamics of spin systems, the three level solid state maser and travelling wave maser.
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J W Orton, D H Paxman and J C Walling Oxford: Pergamon 1970 pp ix + 280 price £2.25 (cloth) £1.75 (paper) This book, one of the 'Selected readings in physics' series, introduces the theory of solid state masers and then presents some of the important papers on the subject, to illustrate the way in which development occurred. The first chapter of part I covers the theory of interaction between radiation and matter, leading to the basic equations for the transition rates between the populations of energy levels on which maser action depends.
Since the demonstration of the possibility of achieving very low noise amplification of signals in the centimetric wavebands, a great deal of work has been carried out in various laboratories with a view to producing and testing devices. The major part of the present article focuses attention on one particular device, the three-level solid-state maser. The physical principles underlying the process of stimulated emission of radiation are in many cases unfamiliar to electronic engineers, and study of the growing literature on the subject can be confusing without a clear understanding of the physics involved. The present article outlines the general theory of emission and radiation processes, particularly as they apply to the microwave spectrum. A quantum mechanical description is employed throughout, and a brief and not very rigorous account is given of the relevant portions of this theory as it applies to the investigation of transistors between energy levels. Well-known expressions are derived for the operating characteristics of a three-level maser, particular attention being given to the significance of the various factors involved and their relationship to easily measured quantities. Little information is included concerning practical maser amplifiers; at the time of writing, few practical devices had been constructed. A survey of recent literature indicates the rapid progress which has since been made, and shows the interest in the development of masers.
David Park McGraw-Hill Publishing Co. Ltd. 1964. Pp. xv + 547. Price 83s. 6d. There are surely few branches of physics which have been so amply, and repetitively, documented as the basic principles of quantum mechanics. Suppressing an almost overwhelming impression of déjà vu, one opens this new entry to the field to find that the text is so organized as to present the discussion of the theory in Part I, and to segregate the applications to Part II, an arrangement for which there is much to be said and which, when as thoughtfully carried out as in the example under review, allows the student, and the lecturer, the opportunity to mix his own blend of theory and application.