Energy transfer coupling of two-photon absorption and reverse saturable absorption for enhanced optical power limiting.
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(60) . A nanosecond time-resolved experiment is used to show that energy transfer from AF-380 to C(60) generates triplet excitation in C(60) that further absorbs the pump beam to enhance the power-limiting function.
Joshi
M P
MP
Swiatkiewicz
J
J
Xu
F
F
Prasad
P N
PN
Reinhardt
B A
BA
Kannan
R
R