Accession Number : AD0470360


Title :   PREPARATION AND PROPERTIES OF POTENTIAL GREEN LASER MATERIALS CONTAINING EXAVALENT URANIUM,


Corporate Author : MICHIGAN UNIV ANN ARBOR INST OF SCIENCE AND TECHNOLOGY


Personal Author(s) : Risgin,Ojars


Report Date : Sep 1965


Pagination or Media Count : 40


Abstract : Since the uranyl ion appeared to be suitable as the basis for laser material oscillating in the green region of the spectrum, attempts were made to produce a crystalline laser material incorporating the uranyl ion. When attempts were made to grow crystals of a number of pure uranyl compounds, only a few could be produced as large, optically perfect single crystals, and these proved insufficiently resistant to mechanical and thermal shock to be practical laser materials. Uranium-activated lithium and sodium fluorides were investigated and found to be potentially suitable. A detailed spectroscopic study was made of the energy levels of the uranium activator, and the luminescent center identified as the ion UO2F42-. An assignment of the lines in uranium-activated lithium fluoride showed that the energy level system was suitable for four-level laser oscillation. When samples of the uranium-activated fluorides were fabricated and tested in Fabry-Perot resonators, no laser oscillation was observed. However, the fluorescence appeared to show a short period of stimulated emission, followed by an anomalously long period of decreased intensity caused by depopulation of the metastable level by upward transitions. (Author)


Descriptors :   CRYSTAL GROWTH , URANYL RADICALS , URANIUM , OXIDES , GROUND STATE , COLOR CENTERS


Distribution Statement : APPROVED FOR PUBLIC RELEASE