Abstract

Optical dephasing in a number of crystalline samples of Y 2 O 3 : Eu 3+ prepared by two different crystal-growth techniques were measured using two pulse photon echo method. For crystals prepared by a laser-heated pedestal growth, we report the dephasing rate, 1/ T m , at 1.4 K is up to two orders of magnitude faster than that previuosly reported for the flame fusion growth crystal. The spatial dependence of the optical dephasing rate, measured by TPPE (two-pulse photon echo), tells that the environments of echo producing ions at least highly depend on the spatial position which can not be detected by conventional laser spectroscopy techniques, suggesting two-pulse photon echo experiment can be served as a tool for probing the uniformity of the samples.

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