Nonexponential fluorescence decay has been observed from both 4I11/2 and 4I13/2 states of Er3+ ions in heavily doped Er: YAG at room temperature. Processes of cross relaxation that originate in these states are shown to be responsible. Rate equations that include cross-relaxation processes are written and numerically solved, to result in the determination of the cross-relaxation coefficients. It is found that these coefficients do not change with Er3+ concentration. The effects of the cross-relaxation processes of Er3+ ions on fluorescence decay and lasing properties are discussed.
© 1990 Optical Society of America
Original Manuscript: March 21, 1989
Manuscript Accepted: February 12, 1990
Published: August 1, 1990
W. Q. Shi, M. Bass, and M. Birnbaum, "Effects of energy transfer among Er3+ ions on the fluorescence decay and lasing properties of heavily doped Er:Y3Al5O12," J. Opt. Soc. Am. B 7, 1456-1462 (1990)