Accession Number : AD0914193

Title :   Rare Earth Laser Engineering Program. Part I

Descriptive Note : Final rept. 1 Jun 72-30 Jun 73,

Corporate Author : HUGHES AIRCRAFT CO CULVER CITY CA LASER SYSTEMS DIV

Personal Author(s) : Caird, John A.

Report Date : OCT 1973

Pagination or Media Count : 86

Abstract : This report discusses the application of current theories of radiative and non-radiative relaxation processes to the evaluation of crystalline rare earth laser devices. A computer program was developed to evaluate radiative oscillator strengths and transition rates between energy levels of trivalent rare earth ions doped in crystals. Non-radiative relaxation rates were computed using a phenomenological theory of multiphonon emission. A listing of the computer program is included in the appendix along with a detailed description of its operation. The analysis was applied first to some fifteen known rare earth laser devices to establish a basis for comparison with predictions. The program was then used to study the possibility of laser emission form a large number of energy levels throughout the rare earth series. This resulted in the identification of many transitions with significant potential for laser action with wavelengths varying from about 0.5 microns to 3.25 microns. Recommendations for future work include fabrication of predicted laser devices along with extensions of the theoretical models. (Author)

Descriptors :   *RARE EARTH ELEMENTS), (*LASERS, COMPUTER PROGRAMS, PHONONS, MOLECULAR ENERGY LEVELS, IONS, PHASE STUDIES, DOPING, TRANSPORT PROPERTIES, THEORY, INTENSITY, OSCILLATORS, LINE SPECTRA, PRASEODYMIUM, NEODYMIUM, PROMETHIUM, SAMARIUM, GADOLINIUM, TERBIUM, DYSPROSIUM, HOLMIUM, ERBIUM, THULIUM.

Subject Categories : Inorganic Chemistry
      Lasers and Masers

Distribution Statement : APPROVED FOR PUBLIC RELEASE