TITLE

High diffraction efficiency polarization gratings recorded by biphotonic holography in an azobenzene liquid crystalline polyester

AUTHOR(S)
Sánchez, C.; Alcalá, R.; Hvilsted, S.; Ramanujam, P. S.
PUB. DATE
June 2001
SOURCE
Applied Physics Letters;6/18/2001, Vol. 78 Issue 25, p3944
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
High diffraction efficiencies have been achieved with polarization gratings recorded in thin films of an azobenzene side-chain liquid crystalline polyester by means of biphotonic processes. Efficiency values up to 30% have been reached after an induction period of 300 s and subsequent evolution with the sample in darkness. These values are at least two orders of magnitude higher than those previously reported for biphotonic recording. The gratings can be erased with unpolarized blue light and partial recovery of the diffraction efficiency has been observed after the erasure process when the sample is kept in darkness. Red light illumination of the erased film increases the recovered efficiency value and the recovery rate. © 2001 American Institute of Physics.
ACCESSION #
4710807

 

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