Abstract
Conjugated polymers belong to a class of materials which has proven to be one of the most fascinating and challenging developed to date for nonlinear optics. They, most specifically bis paratoluene sulfonate (PTS), have been shown to exhibit the largest third order nonlinearities and the strongest two photon absorption of any known material. [1] These properties are a direct consequence of the π-electron delocalization which occurs over multiple double and triple carbon bonds along the backbone chain. The strong one and two photon absorption which occurs in PTS implies that the one and two photon active excited states might also be accessible through even higher order nonlinear processes which satisfy the same symmetry relations between the ground and excited states. Although there have been sporadic reports of three and four photon absorption in semiconductors, four photon absorption has never been unambiguously measured in an organic solid state material before. [2] Here we report observation of four photon absorption in PTS at 1600 nm.
© 1997 Optical Society of America
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