Interferometric analysis of reorientational nonlinear phenomena at 10.6 µm in a nematic liquid crystal
Anno: 2003
Autori: Allaria E., Brugioni S., De Nicola S., Ferraro P., Grilli S., Meucci R.
Affiliazione autori: Istituto Nazionale di Ottica Applicata, Largo E. Fermi 6, 50125 Firenze, Italy; Istituto di Cibernetica \”E. Caianiello\” del Consiglio Nazionele delle Ricerche, Via Campi Flegrei 34, I 80078 Pozzuoli, Italy; Istituto per la Microelettronica e le Microtecnologie del Consiglio Nazionale delle Ricerche, Sezione di Napoli, Via Diocleziano 328, 80124 Napoli, Italy CNR-IMM
Abstract: We describe an infrared interferometric technique based on a two-dimensional spatial fringe analysis Fourier method for investigating the characteristic ring diffraction pattern generated by the self-phase-modulation effect induced in nematic liquid crystals (NLCs) by an infrared laser beam and for measuring the nonlinear refractive index of the NLCs. The experimental setup employs a Mach-Zehnder interferometer with a cw CO2 laser emitting at 10.6 mum and a pyroelectric optoelectronic sensor matrix to detect the modulated ring-pattern intensity distribution formed in the far field by a nematic E7 sample. A Fourier-transform-based analysis of the interference fringe pattern allows comparison of the measurements with the theoretical ring-pattern intensity distribution. We show that accurate determination of the nonlinear refractive index can be obtained by analyzing the two-dimensional phase distribution of the modulated ring pattern. (C) 2003 Optical Society of America.
Giornale/Rivista: APPLIED OPTICS
Volume: 42 (24) Da Pagina: 4827 A: 4834
Parole chiavi: Carbon dioxide lasers; Electromagnetic wave diffraction; Fourier transforms; Interferometry; Laser beams; Light interference; Nematic liquid crystals; Optical sensors; Phase modulation; Refractive index, Optical fringe patterns, Nonlinear opticsDOI: 10.1364/AO.42.004827Citazioni: 3dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2024-04-28Riferimenti tratti da Isi Web of Knowledge: (solo abbonati) Link per visualizzare la scheda su IsiWeb: Clicca quiLink per visualizzare la citazioni su IsiWeb: Clicca qui