The reverse saturable absorption and the optical-limiting response of metal phthalocyanines can be enhanced by use of the heavy-atom effect. Phthalocyanines containing heavy-metal atoms, such as In, Sn, and Pb, show a nearly factor-of-2 enhancement in the ratio of effective excited-state to ground-state absorption cross sections compared with those containing lighter atoms, such as Al and Si. In an f/8 optical geometry, homogeneous solutions of heavy-metal phthalocyanines, at 30% linear transmission, limit 8-ns 532-nm laser pulses to ≤ 3 μJ (the energy for 50% probability of eye damage) for incident energies as high as 800 μJ.
© 1994 Optical Society of America
Original Manuscript: February 3, 1994
Published: May 1, 1994
Joseph W. Perry, Daniel Alvarez, Ingrid Choong, Kamjou Mansour, Seth R. Marder, and Kelly J. Perry, "Enhanced reverse saturable absorption and optical limiting in heavy-atom-substituted phthalocyanines," Opt. Lett. 19, 625-627 (1994)