Nonlinear optical characterization of new ionic liquids by a noise reduced thermally managed EZ-Scan technique

Vinícius C. Ferreira; Graciane Marin; Jesum A. Fernandes; Jairton Dupont; R. B. Correia

doi:10.1117/12.2305879

14 May 2018 Nonlinear optical characterization of new ionic liquids by a noise reduced thermally managed EZ-Scan technique

Vinícius C. Ferreira, Graciane Marin, Jesum A. Fernandes, Jairton Dupont, R. B. Correia

Author Affiliations +

Proceedings Volume 10684, Nonlinear Optics and its Applications 2018; 106841E (2018) https://doi.org/10.1117/12.2305879
Event: SPIE Photonics Europe, 2018, Strasbourg, France

Abstract

Thermal and nonlinear optical characteristics are evaluated for a novel ionic liquid, BMIOMe.NTf₂, by means of the well established thermally managed eclipse Z-scan technique (EZ-scan). Nevertheless, this method still requires samples with good optical quality in order to provide a reasonable signal-noise ratio (SNR) when the material’s nonlinearity is small. Two different procedures where then introduced to improve the SNR against sample linear inhomogeneities and scattering. Both procedures are based in a subtraction of noisy background signals from the nonlinear signal of EZ-scan output. The first is applied to thermal effects and slow sample’s response, based on the perform a subtraction of the initial exposure time from the steady state signal, eliminating the linear noise. In this case, we could verify an increment of SNR from 1:2 to 40:1. The second procedure is related to fast response, e.g., arising from the electronic nonlinear polarizability. This consists in performing two sequential measurement, one with a decade of intensity higher than the first. After performing the subtraction between them, linear background suppression can be verified, with improvement of SNR to 2:1, amount about 10 times the signal value. Performing these procedures, we present a study of properties of ionic liquid BMIOMe.NTf₂. This presents a steady cumulative effect of multiple pulse absorption leading to thermal lensing as measured by the thermally managed EZ-scan technique. The photoinduced conductivity effect observed for this ionic liquid is discussed based on the observed photothermal conversion. Also a fast response corresponding to a nonlinear refractive index was also registered when the time evolution is extrapolated for short times.

Citation Download Citation

Vinícius C. Ferreira, Graciane Marin, Jesum A. Fernandes, Jairton Dupont, and R. B. Correia "Nonlinear optical characterization of new ionic liquids by a noise reduced thermally managed EZ-Scan technique", Proc. SPIE 10684, Nonlinear Optics and its Applications 2018, 106841E (14 May 2018); https://doi.org/10.1117/12.2305879

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