Discrimination between two distinct nonlinear effects by polarization-resolved Z-scan measurements

Author(s)

Melhado, Marlon S. ^[1] ; de Souza, Tiago G. B. ^[1] ; Zilio, Sergio C. ^{[2, 1]} ; Barbano, Emerson C. ^[3] ; Misoguti, Lino ^[1]

Affiliation

^[1] Univ Sao Paulo, Inst Fis Sao Carlos, Caixal Postal 369, BR-13560970 Sao Carlos, SP - Brazil

^[2] Univ Fed Goias, Inst Fis, BR-74001970 Goiania, Go - Brazil

^[3] Univ Fed Parana, Dept Fis, BR-81531980 Curitiba, Parana - Brazil

• Document type: Journal article
• Source: Optics Express; v. 28, n. 3, p. 3352-3360, FEB 3 2020.
• Web of Science Citations: 2

Abstract

We investigated how the Z-scan technique can be explored to distinguish two types of nonlinear refractive effects by employing two distinct laser polarizations. It is possible that pure electronic, molecular orientation and thermal nonlinear effects may occur simultaneously during light-matter interaction. We found a way to discriminate and quantify two distinct nonlinear processes from Z-scan signals measured with linear and circular polarizations. This paper provides analytical equations for nonlinear refractions and in order to test them, we carried out measurements in CS2 and in a rhodamine-B solution, where electronic and orientational, and electronic and thermal nonlinearities mixing, respectively, are present. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement (AU)

• FAPESP's process: 19/00638-1 - Study of the zincblende polycrystalline semiconductors nonlinearities: spectral and spatial dependences
• Grantee: Lino Misoguti
• Support Opportunities: Regular Research Grants
• FAPESP's process: 18/11283-7 - Nonlinear photonics: spectroscopy and advanced processing of materials
• Grantee: Cleber Renato Mendonça
• Support Opportunities: Research Projects - Thematic Grants