Accession Number : ADP008232

Title :   Time-Resolved Hole-Burning in YLiF4:Er3+ With Zeeman Scanning,

Corporate Author : GEORGIA UNIV ATHENS DEPT OF PHYSICS AND ASTRONOMY

Personal Author(s) : Wang, Y. P. ; Meltzer, R. S. ; Wannemacher, R. ; Macfarlane, R. M.

Report Date : 22 MAY 1992

Pagination or Media Count : 3

Abstract : We report the results of time-resolved optical holeburning of Er(3+) ions in YLiF4 (0.02%). In earlier work for H//c we described the time evolution of holes burned at 33kG using laser scanning over a frequency of 4OMHz and we reported, using larger scans, the occurrence of optical side holes. We now describe results for HIc with scans > 400 MHz using a new Zeeman technique for frequency scanning the optical transition frequencies which allow one to study the time evolution of the holes and their associated side-holes. The hole lineshapes evolve with time reaching a linewidth of approx. 10 MHz after 600 micros. We identify the source of the time evolution of the hole shape as spectral diffusion resulting from mutual spin flips of the surrounding fluorine nuclei whose flip rates are strongly modified from the bulk rates by the presence of the large magnetic moment of the Er(3+) ion which produces a 'frozen core'. A computer simulation which takes into account the details of the dynamics of the frozen core successfully describes the time evolution of the holes, confirming the dominant role of F nuclear spin flips.

Descriptors :   *NUCLEAR SPINS, *MOLECULAR SPECTROSCOPY, *ZEEMAN EFFECT, *YTTRIUM ALLOYS, COMPUTERS, CORES, DIFFUSION, DYNAMICS, FLUORINE, FREQUENCY, IONS, LASERS, MAGNETIC MOMENTS, NUCLEI, SCANNING, SHAPE, SIMULATION, TRANSITIONS, OPTICAL PROPERTIES, LINE SPECTRA, SPIN RESONANCE, COMPUTERIZED SIMULATION, RESONANCE.

Subject Categories : Metallurgy and Metallography
      Atomic and Molecular Physics and Spectroscopy
      Nuclear Physics & Elementary Particle Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE