THE QUESTION OF THE POSSIBILITY OF OPTICAL COOLING,
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 05, 1969
- Accession Number
- AD0701993
Entities
People
- E. F. Kustov
- L. I. Surogin
- P. A. Arsenev
Organizations
- National Air and Space Intelligence Center