Multi-photon absorption and optical limiting from six stilbazolium derivatives: donor influences

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 10−76 cm6 s2 and 10−47-10−46 cm4 s/photon, respectively. It was observed that the σ3 values 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 σ2 values.