Harmonic Distortion of the Induced Helical Structure of the Nematic Liquid Crystal Detected by the Distributed Feedback Laser

Abstract

Abstract Helical structure induced in nematics by non-mesogenic optically active dopants (OAD) was studied by means of the distributed feedback laser (DFL) spectroscopy. A difference was found between laser generation frequencies and Bragg frequencies of theselective transmission spectra, attributed to thepresence of two sublattices in the induced helicalstructure due to its distortion.