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IEEE Journal of Quantum Electronics

Determination of the line broadening parameters with hole-burning techniques

W. Bennett, Veniamin P. Chebotayev, J. W. Knutson

Published May 1, 1968• 0 citations
Publisher
DOI
10.1109/jqe.1968.1075118

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Spectral hole burning acting as a high resolution spectroscopic technique has potential applications on high density optical storage. The present paper report the research results on inhomogeneous broadening, fluorescence line narrowing, high temperature persistent spectral hole burning, mechanism of hole burning, hole burning dynamics and thermal stability of spectral holes. We designed and prepared new material system of divalent samarium ion doped alkaline earth metal fluoridehalides for high temperature hole burning. Room temperature hole burning and spectral hole with longer lifetime were performed. Various local configurations were distinguished by using time resolved spectroscopy. Spectral redistribution induced by hole burning indicates that trivalent samarium ions act as electron traps. Hole burning dynamics was analyzesed by using Block theory.
We applied hydrostatic pressure to spectral holes burned into a resorufin doped ethanol/methanol glass. We found that the line shift is perfectly linear with pressure and showed a pronounced dependence on the burn frequency as predicted by theory [J. Chem. Phys. 90, 3274 (1989)]. We exploited the burn frequency dependence to determine the solvent shift of the dye probe and the compressibility of the alcohol glass used. On the other hand, the behavior of the hole width under pressure shows features not predicted by theory: The broadening is, like the line shift, dependent on the burn frequency within the inhomogeneous band, yet in a nonlinear fashion. We attribute the color effect in the pressure induced broadening of the hole to a breakdown of the Gaussian approximation.
In inhomogeneously broadened lines, selective photochemistry with narrow band lasers leads to photochemical hole burning. We describe this phenomenon with particular reference to free-base porphyrin (H2P) and chlorin molecules in n-alkane matrices at low temperatures. It is shown that hole burning, which is permanent at low temperatures, can be used to study homogeneous optical dephasing processes as a function of temperature, to measure fast vibronic relaxation, and to assign complex vibronic spectra. Some of the parameters that are important to the potential use of photochemical hole burning for information storage in inhomogeneously broadened lines are measured and discussed.