Accession Number : ADP008299
Title : Optical Pumping Detection of Anomalous NQR Spectra of Pr3+ in Pr3+:LaF3,
Corporate Author : CALIFORNIA UNIV BERKELEY DEPT OF PHYSICS
Personal Author(s) : Wald, L. L. ; Hahn, E. L. ; Lukac, M.
Report Date : 22 MAY 1992
Pagination or Media Count : 4
Abstract : The nature of inhomogeneous broadening in rare earth systems plays an important role in the dynamical optical -properties of ions in crystals. For this reason much of the work on the nature of the inhomogeneous broadening in rare earth doped systems has concentrated on the investigation of ion-ion interactions such as spectral transfer and up conversion processes. Variations in homogeneous optical dephasing times across the inhomogeneous optical line have also been reported. These studies concentrate on the variations of collective effects of ion- ion interactions at different positions in the inhomogeneous optical line in relatively heavily doped rare earth systems. We report variations in optically detected NQR (ODNQR) linewidths and shifts of Pr3+ hyperfine transitions in the optical ground state as a function of position in the inhomogeneous optical line and for satellite transitions of the 1D2-3H4 transition in lightly doped (0.5 at.%) Pr3+:LaF3. A systematic increase in the broadening of the Pr hyperfine transitions is observed as the laser is tuned toward the wings of the inhomogeneous optical transition without a shift of the NQR center frequency. The principle contribution to the 200KHz (FWHM) inhomogeneous width of the Pr hyperfine levels is explained by magnetic dipole-dipole interactions between the Pr nuclei and the neighboring fluorine spins. This contribution remains constant across the Stark broadened optical transition. Thus we show the existence of an additional broadening mechanism.
Descriptors : *IONS, *OPTICAL PUMPING, *DETECTION, *SPECTRA, *PRASEODYMIUM, *LANTHANUM, *FLUORIDES, ARTIFICIAL SATELLITES, CONSTANTS, CONVERSION, CRYSTALS, FLUORINE, FREQUENCY, FUNCTIONS, GROUND STATE, INTERACTIONS, ION ION INTERACTIONS, LASERS, NUCLEI, OPTICAL PROPERTIES, TRANSFER, TRANSITIONS, VARIATIONS, WIDTH, WINGS, WORK, RARE EARTH ELEMENTS, DOPING, DEUTERIUM, HYDROGEN, DIPOLES, MAGNETIC PROPERTIES, MOLECULAR SPECTROSCOPY.
Subject Categories : Atomic and Molecular Physics and Spectroscopy
Distribution Statement : APPROVED FOR PUBLIC RELEASE