Pulsed light-induced birefringence and polarization holography recording in epoxy polymer with azobenzene

Influence of chromophore concentration and network structure on the photo‐orientation properties of crosslinked epoxy‐based azopolymers

“…It is well known that epoxy networks are highly transparent and have excellent mechanical and thermal properties. There are only a few investigations on epoxy resins as photoresponsive polymers mainly focused on amorphous copolymers 5–11. We have previously studied the reaction kinetics and the optical storage characteristics of two azobenzene‐functionalized epoxy‐based copolymers and a homopolymer containing Disperse Orange‐3, and have contrasted the results with two guest–host systems 12–14.…”

Nonlinear-optical and structural properties of nanocrystalline silicon carbide films

“…Our measurements have shown that the diffraction effi ciency of vector dynamic gratings reached 10 -2 %; on account of the fact that the film thickness is small (d ≤ 1 μm), this is a large value. The principle of recording of vector (polarization) holograms is described in detail in [13]. Analysis of anisotropy of the nonlinear optical response in nanocrystalline SiC films has demon strated once again that nonlinearity is due to the crys talline phase of the film and not to its isotropic com ponent.…”

Pulsed recording of anisotropy and holographic polarization gratings in azo-polymethacrylates with different molecular architectures

“…[21][22][23][24][25][26] Recording using short light pulses ͑in the range of nanoseconds to hundreds of femtoseconds͒ has also been demonstrated to be of relevance for optical applications. [27][28][29][30][31][32][33][34][35][36][37][38] In particular, the use of 532 nm lasers of few nanosecond pulse duration has shown to be effective in the recording of optical anisotropy and holographic gratings. [31][32][33][34][35][36][37][38] Some of these studies have been carried out in liquid crystalline materials, 31 although most of the work has been done in amorphous polymers.…”

“…31,36 Different types of holographic gratings ͑using intensity and polarization patterns͒ have also been recorded in amorphous azobenzene containing polymers using 532 nm nanosecond light pulses. [32][33][34][35][36] Although some contribution to the diffraction efficiency has been associated with bulk anisotropy, the relief contribution is usually dominant even when polarization patterns are employed in the recording. 33 This surface relief contribution prevents the use of this recording protocol in many optical storage applications.…”