In situ optical control and stabilization of the curing process of holographic gratings with a nematic film-polymer-slice sequence structure.
We report on the realization of what we believe to be a new holographic setup for the fabrication of polymer liquid-crystal polymer-slice diffraction gratings, which utilizes an optical-feedback-driven nanopositioning technique. We have increased the stability of the interference pattern by means of a simple piezomirror used in a feedback configuration to keep constant the phase of the interferometer. The feedback system is driven by a proportional, integral, derivative control software, and the stability degree is controlled by the reference signal coming from a standard test grating. A preliminary experimental characterization indicates that good control and stabilization of parasitic fluctuations of the interference pattern are obtained.
De Sio
Luciano
L
Liquid Crystals Laboratory, National Institute for the Physics of Matter, Center of Excellence, Arcavacata di Rende (CS), Italy.
Caputo
Roberto
R
De Luca
Antonio
A
Veltri
Alessandro
A
Umeton
Cesare
C
Sukhov
Andrey V
AV