Accession Number : ADA180977

Title :   Proof of the Feasibility of Coherent and Incoherent Schemes for Pumping a Gamma-Ray Laser.

Descriptive Note : Quarterly technical progress rept. 1 Jan-31 Mar 87,

Corporate Author : TEXAS UNIV AT DALLAS RICHARDSON CENTER FOR QUANTUM ELECTRONICS AND APPLICATIONS

Personal Author(s) : Collins,Carl B.

Report Date : APR 1987

Pagination or Media Count : 79

Abstract : Recent approaches to the problem of the gamma-ray laser have focused upon upconversion techniques in which metastable nuclei are pumped with long wavelength radiation. At the nuclear level the storage of energy can approach tera-joules. 10 to the 12th power J per liter for thousands of years. However, any plan to use such a resource for a gamma-ray laser poses problems of a broad interdisciplinary nature requiring the fusion of concepts taken from relatively unrelated fields of physics. Our research group has described several means through which this energy might be coupled to the radiation fields with cross sections for stimulated emission that could reach 10 to the -17th power sq. cm. Such a stimulated release could lead to output powers as great as 3 x 10 to the 21st power Watts/liter. Since 1978 we have pursued an approach for the upconversion of longer wavelength radiation incident upon isomeric nuclear populations that can avoid many of the difficulties encountered with traditional concepts of single photon pumping. Recent experiments have confirmed the general feasibility and have indicated that a gamma-ray laser is feasible if the right combination of energy levels and branching ratios exists in some real material. Of the 1986 distinguishable nuclear materials, the present state-of-the-art has been adequate to identify 29 first-class candidates, but further evaluation cannot proceed without remeasurements of nuclear properties with higher precision.

Descriptors :   *NUCLEAR PROPERTIES, *ENERGY LEVELS, *GAMMA RAYS, *LASERS, CROSS SECTIONS, PHYSICS, FEASIBILITY STUDIES, LONG WAVELENGTHS, RADIATION, METASTABLE STATE, NUCLEI, THERMAL RADIATION, INCOHERENT SCATTERING, FISSIONABLE MATERIALS, RADIOACTIVE MATERIALS, PLANNING, MATERIALS, PHOTONS, ENERGY STORAGE, CONVERSION, EMISSION, STIMULATION(GENERAL), PUMPING

Subject Categories : Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE