The linear absorption, multi-photon absorption and subsequently induced optical limiting from Six Stilbazolium derivatives with different donor units were studied with a mode-locked/Q-switched Nd:YAG pulses with a duration of 35 ps and a repetition of 10 Hz at 1064 nm. The measured molecular 3PA and 2PA cross-sections (σ3/σ2) were in the order of 10-76cm6s2and 10-47-10-46cm4s/photon, respectively. It was observed that the σ3values increase linearly with increasing the electron-donating ability of the donor units, from N-methylpyrrole, to pyrrole, to furan, and to thiophene. Similar influences were observed for the σ2values. © 2005 Elsevier B.V. All rights reserved.
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