Abstract

An interesting thermal effect associated with intense ultraviolet excitation of bismuth germanate (Bi4Ge3O12) crystal is found to increase the excitation rate approximately 2 orders of magnitude beyond that determined from excitation intensity and absorption. The effect involves a nonlinear increase of absorption of thermal origin owing to a shift of the absorption edge and indicates the need to take this shift into account when dealing with excited-state absorption and gain measurements.

© 1991 Optical Society of America

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