Accession Number : ADP008271
Title : Frequency - Domain Measurements of Spectral Hole Patterns Burned with Phase - Coherent Pulses,
Corporate Author : IBM ALMADEN RESEARCH CENTER SAN JOSE CA
Personal Author(s) : Jefferson, C. M. ; Meixner, Alfred J.
Report Date : 22 MAY 1992
Pagination or Media Count : 4
Abstract : Several investigations have shown that in some systems stimulated photon echoes may be obtained over times much longer than the excited state relaxation T(1). It has been claimed that the mechanism for this anomalously long storage time is the formation of a frequency dependent modulation of the ground state population which persists because of spectral hole-burning. Such a population grating produced by coherent multipulse excitation and spectral hole-burning has been measured only in a few cases. We have investigated the frequency dependence of such hole patterns stored in the ground state population with respect to the parameters of both the excitation sequence and those of the guest-host system. We compare our results to a theoretical model obtained using density matrix formalism to describe an inhomogeneously broadened distribution of two level systems with a relaxation path into an additional reservoir state to allow for spectral hole-burning. We chose two pulse stimulation of the inhomogeneously broadened band as a format for studying stored population gratings because the structure of such gratings is especially simple. In our experiments we were able to accurately control the pulse amplitudes, durations, separations and the relative optical phases. We will show that the phase relationship of the stimulating pulses has a profound effect on the structure of the population grating.
Descriptors : *FREQUENCY, *PULSES, *COHERENCE, AMPLITUDE, CONTROL, DENSITY, EXCITATION, FORMATS, GROUND STATE, MODELS, MODULATION, PARAMETERS, PATHS, PATTERNS, PHASE, PHOTONS, POPULATION, RELAXATION, RESERVOIRS, SEPARATION, SEQUENCES, STORAGE, STRUCTURES, TIME, MEASUREMENT, ECHOES, GRATINGS(SPECTRA), HOMOGENEITY, OPTICS, SPECTRA, FREQUENCY SHIFT, ATOMIC ENERGY LEVELS, MOLECULAR SPECTROSCOPY.
Subject Categories : Radiofrequency Wave Propagation
Atomic and Molecular Physics and Spectroscopy
Distribution Statement : APPROVED FOR PUBLIC RELEASE