The darkening of Tb3+-doped phosphosilicate optical fibers by resonant excitation at 488 nm is found to be almost completely reversible by exposure to off-resonance excitation at 514 nm. The darkening and bleaching are three- and two-photon processes, respectively, and the steady-state absorption of the fiber is controllable by the competition between the two processes.
© 1994 Optical Society of America
Original Manuscript: January 3, 1994
Published: July 1, 1994
G. R. Atkins and F. Ouellette, "Reversible photodarkening and bleaching in Tb3+-doped optical fibers," Opt. Lett. 19, 951-953 (1994)