Accession Number : AD0743223

Title :   Infrared Laser Materials.

Descriptive Note : Final technical rept. 15 Mar 71-14 Mar 72,

Corporate Author : RAYTHEON CO WALTHAM MASS RESEARCH DIV

Personal Author(s) : Morrison,Andrew D. ; Monchamp,Roch R. ; Bass,Michael ; Weber,Marvin J.

Report Date : JUN 1972

Pagination or Media Count : 73

Abstract : Neodymium-doped yttrium orthoaluminate is investigated for use as a high-efficiency optically-pumped infrared laser material. The growth of high optical quality crystals was studied and growth parameters including pull and rotation rates, atmosphere, thermal ambients, and annealing are discussed. Measurements of hardness, the distribution coefficient of Nd(3+) in YAlO3, dopant inhomogeneities, the presence of scattering sites, and the tube effect are described. Effects of increasing the Nd(3+) concentration and possible sensitizer ions for Nd(3+), including cerium, vanadium, and chromium, are considered. Optical spectra of Ce(3+):YAlO3 and measurements of the rate and efficiency of Cr(3+) yields Nd(3+) energy transfer are presented. Laser rods containing 1, 2, and 3 percent Nd(3+) and Nd(3+) sensitized with Cr(3+) were prepared and tested in long-pulse, Q-switched, and CW laser operation. The results from these b-axis Nd:YAlO3 rods are compared with those obtained from Nd:YAG rods. (Author)

Descriptors :   (*LASERS, YTTRIUM COMPOUNDS), (*INFRARED LASERS, *INFRARED OPTICAL MATERIALS), ALUMINATES, DOPING, NEODYMIUM, CRYSTAL GROWTH, OPTICAL PUMPING, OPTICAL PROPERTIES, CHROMIUM COMPOUNDS, THERMAL PROPERTIES, PERFORMANCE(ENGINEERING), EFFICIENCY, ATOMIC ENERGY LEVELS, ELECTRON TRANSITIONS

Subject Categories : Lasers and Masers
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE