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, C<sub>60</sub> . A nanosecond time-resolved experiment is used to show that energy transfer from AF-380 to C<sub>60</sub> generates triplet excitation in C<sub>60</sub> that further absorbs the pump beam to enhance the power-limiting function.
© 1998 Optical Society of America
Mukesh P. Joshi, J. Swiatkiewicz, Faming Xu, Paras N. Prasad, B. A. Reinhardt, and Ram Kannan, "Energy transfer coupling of two-photon absorption and reverse saturable absorption for enhanced optical power limiting," Opt. Lett. 23, 1742-1744 (1998)