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Hydrostatic pressure effects on spectral hole burning in a Shpol’skii system

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Abstract

Hydrostatic-pressure effects on persistent spectral holes in a polycrystalline solid solution of chlorin (Chl) in n-octane (C8:Chl, a Shpol’skii system) at 4.2 K were studied at high-pressure [up to 8.4 kbars (1 kbar = 750.06 kTorr)] isobaric (burning and recording at the same pressure) conditions as well as in low-pressure (21–39 bars) nonisobaric (burning and recording at different pressures) experiments. A significant decrease of the hole width was seen at high pressures, with the FWHM of holes in the 15 730-cm−1 line being 130 and 45 MHz at 1 bar and 5.5 kbars, respectively. The latter value approaches the normal-pressure lifetime limit of 40 MHz. A pressure-induced site-dependent instability of spectral holes was found at pressures above 5.5 kbars. High-pressure shifts of Shpol’skii lines and low-pressure hole shifts gave the same pressure coefficient, −4.8 cm−1/kbar, for the S1S0 (0–0) transition energy. This coefficient yielded the value of 13.2 Mbars−1 for the local compressibility. Reversible non-Gaussian non-area-conserving hole broadening was observed in nonisobaric low-pressure experiments.

© 1992 Optical Society of America

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