Abstract

Optical hole burning is used to study optical dephasing of the ⁷F₀ ⇒ ⁵D₀ transition in samples of Y₂O₃:Eu³⁺ grown by both flame fusion and laser-heated pedestal growth. The samples exhibited a wide variation in their low-temperature hole widths, and the measured hole linewidths were in reasonable agreement with homogeneous linewidths obtained from values of T₂ that were determined with two-pulse photon echoes. The sample that had the longest value of T₂ (510 μs) from the echo measurements gave a hole width of 3.5 kHz. This is believed to be the narrowest spectral feature observed directly in the frequency domain for a solid. Other samples produced wider holes that were not correlated with the Eu³⁺ impurity concentrations. Time-resolved hole burning in one of the samples showed a slow and continuous broadening of the spectral hole from 130 kHz at 3 ms to 900 kHz at 10 s after hole burning. It is suggested that the additional broadening is associated with some form of disorder modes in this ordered crystalline solid.

© 1994 Optical Society of America

Nonlinear laser spectroscopy of Eu³⁺:Y₂SiO₅ and its application to time-domain optical memory

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