Measurements of refractive nonlinearity of gases by nonlinear elliptical polarization rotation method

• Grant number: 13/23999-3
• Support Opportunities: Regular Research Grants
• Start date: April 01, 2014
• End date: September 30, 2016
• Field of knowledge: Physical Sciences and Mathematics - Physics - Condensed Matter Physics
• Principal Investigator: Lino Misoguti
• Grantee: Lino Misoguti
• Host Institution: Instituto de Física de São Carlos (IFSC). Universidade de São Paulo (USP). São Carlos , SP, Brazil

Abstract

The study of the third-order refractive nonlinearity of materials is very important in term of theoretical and experimental point of view, due to help developing the theoretical models of nonlinearities, and due to the challenger to develop new and more precise technique for measuring the magnitude of the refractive nonlinearities, respectively, for instance. Recently, we have developed a precise method for measuring the nonlinear elliptical polarization rotation (NEPR), which is a process related to the third-order refractive nonlinearity, using lock-in amplifier. In this way, in this project we have plan to apply such new method to determine the magnitudes of gaseous media nonlinearities, which due to their low density, they are hard to be measured. In this context, we propose to use this new technique of measuring NEPR to determine the refractive nonlinearity magnitude and dispersion of different gaseous media confined in capillary. In this case, the use of capillary has a function to confine the gases and increase the interaction length to compensate their low densities. To induce the nonlinear effect, we intend to use tunable ultrashort femtosecond (fs) pulses. Furthermore, due to tensor nature of the refractive optical nonlinearity, depending of the type of nonlinear effect, medium symmetry or polarization state of the light beam used for its measurements, different third-order nonlinear susceptibility elements can be accessed. In this way, the NEPR measurements can be useful to help to distinguish the origin of different type of nonlinearity of one particular medium. (AU)

Scientific publications

(4)

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

DE SOUZA, TIAGO G. B.; BARBANO, EMERSON C.; ZILIO, SERGIO C.; MISOGUTI, LINO. Measurement of nonlinear refractive indices of air, oxygen, and nitrogen in capillary by changing the temporal width of short laser pulses. JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS, v. 34, n. 10, p. 2233-2237, OCT 1 2017. (11/12399-0, 13/23999-3, 16/20828-1)

BARBANO, EMERSON CRISTIANO; BEZERRA DE SOUZA, TIAGO GUALBERTO; ZILIO, SERGIO CARLOS; MISOGUTI, LINO. Comparative study of electronic and orientational nonlinear refractive indices with nonlinear ellipse rotation measurements. JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS, v. 33, n. 12, p. E40-E44, DEC 1 2016. (13/23999-3)

MIGUEZ, MARIA L.; DE SOUZA, TIAGO G. B.; BARBANO, EMERSON C.; ZILIO, SERGIO C.; MISOGUTI, LINO. Measurement of third-order nonlinearities in selected solvents as a function of the pulse width. Optics Express, v. 25, n. 4, p. 3553-3565, FEB 20 2017. (13/23999-3)

MELHADO, MARLON DOS SANTOS; BARBANO, EMERSON CRISTIANO; VIVAS, MARCELO GONCALVES; ZILIO, SERGIO CARLOS; MISOGUTI, LINO. Absolute Nonlinear Refractive Index Spectra Determination of Organic Molecules in Solutions. Journal of Physical Chemistry A, v. 123, n. 4, p. 951-957, JAN 31 2019. (13/23999-3)