Detection of spin magnetization variation in a two-level maser oscillator

ABSTRACT THE phenomenon of amplitude modulation in the spontaneous emission of two-level masers has been observed by several investigators1–3, and has been the subject of a number of

theoretical discussions3–5. The basic mechanism underlying most of the semi-classical treatments is an oscillatory transfer of energy between the spin system, in the working substance, and

the cavity radiation field. In such a process the spin magnetization vector _M_ should undergo damped, pendulum-like nutations, correlated to the modulation of the emission, between the

inverted state, _M_ anti-parallel to the steady magnetic field in the _z_ direction, and the thermal equilibrium state, _M_ parallel to the steady field. The quantum mechanical treatment6 of

the interaction between the spin system and the radiation field in the cavity also suggests the oscillatory behaviour of _M__z_. Stevens6 further suggested that the direct observation of

the variation of _M__z_, during an oscillation pulse, would be a more instructive test of the theories mentioned than monitoring the modulated cavity energy. Evidence confirming the

suggested behaviour of _M_ has been obtained in an induction experiment designed to detect the variations in the ‘dipole’ field of _M__z_. Access through your institution Buy or subscribe

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Download references AUTHOR INFORMATION AUTHORS AND AFFILIATIONS * School of Natural Philosophy, University of St. Andrews, I. M. FIRTH & D. BIJL Authors * I. M. FIRTH View author

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Reprints and permissions ABOUT THIS ARTICLE CITE THIS ARTICLE FIRTH, I., BIJL, D. Detection of Spin Magnetization Variation in a Two-level Maser Oscillator. _Nature_ 192, 860–861 (1961).

https://doi.org/10.1038/192860a0 Download citation * Issue Date: 02 December 1961 * DOI: https://doi.org/10.1038/192860a0 SHARE THIS ARTICLE Anyone you share the following link with will be

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