Enhanced reverse saturable absorption and optical limiting in heavy-atom-substituted phthalocyanines
Joseph W. PerryJet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109 USADaniel ÁlvarezBeckman Institute, California Institute of Technology, Pasadena, California 91125 USAIngrid ChoongBeckman Institute, California Institute of Technology, Pasadena, California 91125 USAKamjou MansourJet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109 USASeth R. MarderJet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109 USAKelly J. PerryJet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109 USA
1994en
ABI
Annotatsiya
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 microJ (the energy for 50% probability of eye damage) for incident energies as high as 800 microJ.
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