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- Title
Optimization of Photorefractivity Based on Poly( N-vinylcarbazole) Composites: An Approach from the Perspectives of Chemistry and Physics.
- Authors
Kinashi, Kenji; Wang, Yu; Sakai, Wataru; Tsutsumi, Naoto
- Abstract
The optimization of photorefractivity (PR) based on a poly(N-vinylcarbazole) (PVCz) composite devise is proposed from the perspectives of chemistry and physics. The device's PR chemistry (dependence of PVCz's molecular weight) and physics (dependence of grating periodicity and laser wavelength) are studied. Increasing the molecular weight of PVCz from 23 000 to 1 270 000 g mol−1 significantly increases diffraction efficiency, grating build-up speed (inverse of response time), and sensitivity. Narrowing grating period from 5.1 to 1.1 μm gives faster response time and larger optical gain. Shorter wavelength of writing laser from 633 to 532 nm provides higher diffraction efficiency, faster response time, and larger optical gain.
- Subjects
PHOTOREFRACTIVE effect; DIFFRACTION grating efficiency; WAVELENGTHS; DIFFRACTION patterns; DISTRIBUTED feedback lasers
- Publication
Macromolecular Chemistry & Physics, 2013, Vol 214, Issue 16, p1789
- ISSN
1022-1352
- Publication type
Article
- DOI
10.1002/macp.201300208