Abstract

We introduce a new approach to enhancing the optical power-limiting function at near-IR wavelength 800 nm by coupling effective two-photon absorption in one molecule with excited-state absorption in another molecule. We experimentally demonstrate this approach by using a strong two-photon absorbing dye, AF-380, and a strong reverse saturable absorber, C60. A nanosecond time-resolved experiment is used to show that energy transfer from AF-380 to C60 generates triplet excitation in C60 that further absorbs the pump beam to enhance the power-limiting function.

© 1998 Optical Society of America

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