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Quantum Electronics

'Two-level', Stokes, and anti-Stokes pumping of a nuclear gamma laser with anisotropic hidden inversion

Лев Абрамович Ривлин

Published Feb 28, 1999• 2 citations
Publisher

Abstract

Recoil in radiative gamma transitions leads to a discrete line spectrum of absorption and emission resonances in an ensemble of free nuclei. This opens up the possibility of efficient pumping of such nuclei and of hidden inversion in an nonstandard 'optical' scheme without participation of the third auxiliary level, as well as in Stokes and anti-Stokes schemes. Quantitative estimates are given for several nuclides.

DOI
10.1070/qe1999v029n02abeh001429

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Recoil in radiative gamma transitions leads to a discrete line spectrum of absorption and emission resonances in an ensemble of free nuclei. This opens up the possibility of efficient pumping of such nuclei and of hidden inversion in an nonstandard 'optical' scheme without participation of the third auxiliary level, as well as in Stokes and anti-Stokes schemes. Quantitative estimates are given for several nuclides.
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The resonance anti-Stokes conversion of broadband X-ray radiation to stimulated gamma radiation of free isomer nuclei is considered. The conversion involves the two-quantum transition from the initial long-lived isomer state of a nucleus via an intermediate level to the final state located below the isomer state. The quantum-mechanical calculation of the cross section for resonance stimulated anti-Stokes scattering involving quanta of the different multipolarity yields the estimate of the gain of stimulated gamma radiation in a nuclear beam with the spectrally local inversion and the estimate of the threshold spectral density of the X-ray pump radiation flux.
We discuss a possibility for obtaining the self-amplified spontaneous emission of gamma radiation in an active medium with hidden population inversion of nuclear states. Hidden inversion appears in cooled nuclear ensembles due to assistance of the nuclear recoil in emission and absorption of gamma quanta. Establishing a hidden inversion allows an amplification of gamma radiation to occur in a particular frequency range without excess of the number of excited nuclei over the number of unexcited nuclei. We formulate a set of requirements to the pumping radiation and to the amplifying nuclear medium crucial to the development of gamma-ray lasing.