Chromophore-incorporated polymers have been optimized with regards to their nonlinearities and thermal stabilities, but little attention has been paid to other technologically important properties of these materials. Of these, linear and nonlinear absorption at used wavelengths are of paramount importance. Linear absorption can be measured with high sensitivity for thin film polymer samples using photothermal deflection spectroscopy, as we demonstrate for (poly)methylmethacrylate. The two-photon absorption coefficient at 1300 nm of two side-chain nonlinear optical polymers is obtained, and the results are compared according to the position of the two-photon energy with respect to the known chromophore excited states. Both linear absorption and two-photon absorption can lead to photochemistry, and we examine the possibility of two-photon induced photodegradation based on photobleaching kinetics data.
|Original language||English (US)|
|Number of pages||12|
|Journal||Molecular Crystals and Liquid Crystals Science and Technology Section B: Nonlinear Optics|
|Publication status||Published - 1993|
ASJC Scopus subject areas
- Control and Systems Engineering
- Condensed Matter Physics