Anomalous and strong optical absorption occurs in Pr-doped LaCl3 crystals for laser pump light connecting excited electronic states of the Pr ion and intensity in excess of a well-defined threshold value. We have measured the absorption as a function of pumping intensity and compare the results with mathematical models of a laser-induced excited-state population.
© 1989 Optical Society of America
Original Manuscript: October 11, 1988
Manuscript Accepted: December 19, 1988
Published: April 1, 1989
A. W. Kueny, W. E. Case, and M. E. Koch, "Nonlinear-optical absorption through photon avalanche," J. Opt. Soc. Am. B 6, 639-642 (1989)