Strong optical limiting and large two-photon absorptivities are reported for a class of bis-donor diphenylpolyene derivatives with varying polyene bridge lengths. These molecules exhibit strong optical limiting using nanosecond pulses over a broad spectral range. Bis(diphenylamino)stilbene exhibits a 90 nm red shift of its optical limiting band, and only a minimal shift of about 13 nm of its lowest one-photon electronic absorption band relative to bis(di-n-butylamino)stilbene. This suggests a potential for broadband optical limiting with high transparency using mixtures of such compounds. Pulse width dependent nonlinear transmission measurements suggest that two-photon pumped excited-state absorption contributes significantly to the limiting of nanosecond pulses.
|Original language||English (US)|
|Number of pages||7|
|Journal||Materials Research Society Symposium - Proceedings|
|State||Published - Dec 1 1997|
|Event||Proceedings of the 1997 MRS Spring Meeting - San Francisco, CA, USA|
Duration: Mar 31 1997 → Apr 2 1997