We report on the experimental observation of two-wave mixing that occurs inside a sample between the beams used for the fabrication of polymer-liquid-crystal-polymer slices (POLICRYPS) diffraction gratings. The effect depends on the phase shift between the curing interference pattern and the grating being cured, This shift can be mechanically induced by accidental vibrations of the experimental setup; thus a high setup stability is needed. We devised a mechanism that enables us to control setup vibrations in situ and used it to monitor the experiment. When the mechanically induced shift was significantly small, wave mixing was observed only if the initial intensities of the two curing beams were different from each other. © 2005 Optical Society of America.
Observation of two-wave coupling during the formation of POLICRYPS diffraction gratings / Caputo, Roberto; De Sio, Luciano; Veltri, Alessandro; Umeton, Cesare; Sukhov, Audrey V.. - In: OPTICS LETTERS. - ISSN 0146-9592. - 30:14(2005), pp. 1840-1842. [10.1364/OL.30.001840]
Observation of two-wave coupling during the formation of POLICRYPS diffraction gratings
De Sio, Luciano;
2005
Abstract
We report on the experimental observation of two-wave mixing that occurs inside a sample between the beams used for the fabrication of polymer-liquid-crystal-polymer slices (POLICRYPS) diffraction gratings. The effect depends on the phase shift between the curing interference pattern and the grating being cured, This shift can be mechanically induced by accidental vibrations of the experimental setup; thus a high setup stability is needed. We devised a mechanism that enables us to control setup vibrations in situ and used it to monitor the experiment. When the mechanically induced shift was significantly small, wave mixing was observed only if the initial intensities of the two curing beams were different from each other. © 2005 Optical Society of America.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
