Accession Number : AD0701993

Title :   THE QUESTION OF THE POSSIBILITY OF OPTICAL COOLING,

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Arsenev,P. A. ; Kustov,E. F. ; Surogin,L. I.

Report Date : 05 SEP 1969

Pagination or Media Count : 7

Abstract : The possibility of cooling a ruby single crystal by means of an external source of monochromatic light was predicted theoretically. Experiments proving the possibility in principle of such a cooling mechanism in ruby single crystals were conducted by means of two identical laser elements containing 0.05 percent Cr(+3). One of them, located in a closed cavity, was illuminated by induced emission of the other and its luminescence at that moment was measured with a DFS-13 spectrograph. As a result of the experiments, we detected luminescence of a ruby with R1 and R2 lines during its illumination by pulsed emission of a ruby laser through a red light filter; the ratio of intensities was equal to 0.3. 'Blind' experiments - without a crystal to be cooled or with the crystal replaced by a sapphire single crystal - confirmed the impossibility of illumination of the cooled crystal by extraneous emission. In this way the possibility of the mechanism described above was confirmed. (Author)

Descriptors :   (*LASERS, COOLING), (*RUBY, COOLING), LUMINESCENCE, LINE SPECTRA, USSR

Subject Categories : Lasers and Masers

Distribution Statement : APPROVED FOR PUBLIC RELEASE