Accession Number : ADD015154

Title :   Method and Apparatus for Lasing.

Descriptive Note : Patent, filed 21 Feb 90, patented 6 Aug 91,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Esterowitz, Leon ; Allen, Roger E ; Kintz, Gregory J

Report Date : 06 Aug 1991

Pagination or Media Count : 5

Abstract : A laser system employing thulium and holmium in a trivalent state. The quantum levels of interest in the thulium and holmium are coupled so that one pumping photo absorbed by the thulium results in two photons emitted by the holmium, making for an unusually efficient laser system. The lower level is sufficiently depopulated at room temperature to allow laser operation without cryogenics. In preferred embodiments, the laser pump can be a laser diode, itself especially efficient and whose output frequency is closely matched in photon energy to the thulium quantum state of interest, thus lending additional efficiency to the overall system. The thulium and the holmium exist in an yttrium-aluminum garnet crystal as lattice replacements for yttrium. (Author)

Descriptors :   CRYOGENICS, CRYSTALS, DIODES, EFFICIENCY, ENERGY, FREQUENCY, HOLMIUM, LASER PUMPING, LASERS, LOW LEVEL, OPERATION, OUTPUT, PHOTOGRAPHS, PHOTONS, PUMPING, QUANTUM THEORY, THULIUM, VALENCE, YTTRIUM, YTTRIUM ALUMINUM GARNET

Subject Categories : Lasers and Masers
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE