title: Concentration Dependent Approach for Accurate Determination of Two-Photon Absorption Cross-Section of Fluorescent dye Molecule.
abstract: We have investigated the concentration dependent of two-photon induced fluorescence (TPIF) in methanolic solution of Rhodamine 6G and Rhodamine B dye using 120 fs laser pulses at 780 nm, 76 MHz repetition rate. TPIF study of these dyes was compared with their respective one photon fluorescence intensity. We have shown the effect of chopper on TPIF intensity from Rhodamine dyes, which have shown direct influence on the determined TPA Cross section of these dyes.
authors.affiliation: Department of Chemistry, Indian Institute of Technology, Kanpur, 208016, India.
authors.forename: Sandeep Kumar
authors.initials: SK
authors.lastname: Maurya
authors.affiliation: Department of Chemistry, Indian Institute of Technology, Kanpur, 208016, India.
authors.forename: Chayan
authors.initials: C
authors.lastname: Dutta
authors.affiliation: Department of Chemistry, Indian Institute of Technology, Kanpur, 208016, India. dgoswami@iitk.ac.in.
authors.forename: Debabrata
authors.identifier: http://orcid.org/0000-0002-2052-0594
authors.initials: D
authors.lastname: Goswami
keywords: High repetition femtosecond pulses; Spectroscopy; Two-photon induced fluorescence