Accession Number : ADP008258

Title :   Spectral Hole-Burning Between 2 K and Room Temperature in Sm2+ Doped Substitutionally Disordered Microcrystals,

Corporate Author : EIDGENOESSISCHE TECHNISCHE HOCHSCHULE ZURICH (SWITZERLAND)

Personal Author(s) : Holliday, Keith ; Wei, Changjiang ; Croci, Mauro ; Wild, Urs P.

Report Date : 22 MAY 1992

Pagination or Media Count : 4

Abstract : Photon gated spectral hole-burning was first observed in a samarium doped crystal, BaFCI:Sm2+. This material was of interest to the development of optical memories as the holes were found to be stable to room temperature thermal cycling. Holes could be burnt at liquid helium temperatures but as the temperature was raised the line quickly became homogeneously broadened. The addition of bromine to the melt succeeded in broadening the inhomogeneous linewidths to about 2 nm through substitutional disorder 21 and persistent holes were observed at 77 K. Subsequently, a study of the parameters for spectral hole-burning in a BaFCIO.5Bro.5:Sm 2+ crystalline powder was performed and the highest temperature for which persistent hole-burning had been observed was raised to 133 K. Here we report spectral hole-burning at room temperature (figure 1) in a related compound, SrO.5MgO.5FC1O.5Bro.5:Sm2+ The hole-burning characteristics of this class of materials are dependent on the method of preparation and, for instance, a separate study of BaFCIO.5Bro.5:Sm2+ observed holes at 183 K, decaying with a half-life of a few minutes. The preparation method for the samples used here has previously been described.

Descriptors :   *MOLECULAR SPECTROSCOPY, *CRYSTALS, BROMINE, COMBUSTION, CRYSTALS, HALF LIFE, HELIUM, LIQUID HELIUM, MELTS, PHOTONS, POWDERS, ROOM TEMPERATURE, SAMARIUM, TEMPERATURE, DOPING, LINE SPECTRA, RESONANCE.

Subject Categories : Atomic and Molecular Physics and Spectroscopy
      Crystallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE