Accession Number : ADP008297

Title :   Accumulated Photon Echoes as a Probe of Radiationless Relaxation Processes in Nd-Doped Glasses,

Corporate Author : OKLAHOMA STATE UNIV STILLWATER CENTER FOR LASER RESEARCH

Personal Author(s) : Ver Steeg, Keith W. ; Reeves, Roger J. ; Powell, Richard C.

Report Date : 22 MAY 1992

Pagination or Media Count : 4

Abstract : Accumulated photon echoes (APE) were used to measure the dephasing rates of Nd3+ in various inorganic glasses as a function of excitation wavelength, sample temperature, and laser power. Although dephasing processes of optical transitions in solids are of considerable interest, they are poorly understood, largely due to the lack of experimental data on femtosecond and picosecond time scales. The APE technique using sub-picosecond laser sources has made it possible to measure in the time domain dephasing rates of inhomogeneously broadened transitions in amorphous systems. This technique therefore acts as a complement to dephasing experiments done in the frequency domain, such as spectral holeburning. Other researchers have used similar stimulated echo techniques to optically store binary information in solid state materials. Thus the results of this work provide information useful to the understanding of fundamental physical processes affecting the characteristics of spectral holeburning and in addition they may have direct application to optical storage techniques based on photon echoes.

Descriptors :   *ECHOES, *PHOTONS, *PROBES, *GLASS, ADDITION, EXCITATION, EXPERIMENTAL DATA, FREQUENCY, FREQUENCY DOMAIN, FUNCTIONS, LASERS, MATERIALS, OPTICAL STORAGE, POWER, RATES, SOLIDS, STORAGE, STORES, TEMPERATURE, TIME, TIME DOMAIN, TRANSITIONS, WORK, RELAXATION, DOPING, NEODYMIUM, IONS, PHASE, INORGANIC MATERIALS, OPTICS, MOLECULAR SPECTROSCOPY, BINARY NOTATION, YAG LASERS.

Subject Categories : Ceramics, Refractories and Glass
      Atomic and Molecular Physics and Spectroscopy
      Optics
      Inorganic Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE