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Laser Physics

Two-quantum stimulated emission of gamma radiation

Задерновский Анатолий Андреевич

Published Apr 1, 2009• 1 citation
Publisher

Abstract

Various schemes exploiting two-quantum nuclear transitions for the generation of coherent gamma radiation (stimulated anti-Stokes and stimulated two-quantum de-excitation of isomeric nuclei in an active medium with the hidden population inversion of nuclear states and the ignition of an avalanche-like stimulated gamma-emission by counterpropagating X-rays) are discussed.

DOI
10.1134/s1054660x0904029x

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Various schemes exploiting two-quantum nuclear transitions for the generation of coherent gamma radiation (stimulated anti-Stokes and stimulated two-quantum de-excitation of isomeric nuclei in an active medium with the hidden population inversion of nuclear states and the ignition of an avalanche-like stimulated gamma-emission by counterpropagating X-rays) are discussed.
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This report results from a contract tasking Moscow State University as follows: Exploration of methods to control the radiative gamma- processes in nuclei is currently one of the most promising investigation directions of the modern Quantum Nucleonics - a new realm of contemporary Physics which spreads the basic conceptual ideas and methods of optical Quantum Electronics of atoms and molecules to the gamma-ray range and atomic nuclei and even anti-particles. One of the most important problems in this field is the generation of coherent gamma-radiation by a Gamma-ray Lasing (GRL) process which makes use of excited nuclei as an amplifying medium. The most likely medium for gamma-ray lasers is an ensemble of metastable nuclear isomers, Direct excitation of these isomeric states by electrons or X-ray photons will also create a deeper understanding of nuclear structure and properties.
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.
This work concerns the demonstration of the feasibility of the tuning and perhaps even stimulation of nuclear radiation. Theory1–3 has indicated that anti-Stokes Raman up- conversion of intense but conventional long-wavelength sources of radiation produced by scattering from isomeric states of nuclear excitation could lead to significant sources of tunable γ radiation characterized by the natural Mossbauer width of the lines. This would result in lines with sub-angstrom wavelengths and widths of a few megahertz. Further computations4 have suggested that this type of coherent, as well as a new type of incoherent, optical pumping could even lead to appreciable levels of inversion of the population of nuclear levels that would be capable of supporting the growth of stimulated γ-ray intensity. Whether these processes can reach threshold depends on the resolution of basic issues lying in an interdisciplinary region between quantum electronics and nuclear physics that have not been previously addressed.