Abstract
The effect of the repetition rate of femtosecond laser pulses on the two-photon absorption and nonlinear refraction of pure organic liquids is presented using the conventional Z-scan technique. Such a study provides a way to determine the nature of light-matter interaction, explicitly enabling the identification of the linear versus nonlinear regimes. Based on the type of light-matter interaction, we have identified the thermal load dissipation time for the organic liquids. Our experimental results are in good agreement with the theoretically calculated decay time for the dissipation of thermal load.
Highlights
Over the past few decades, the characterization of Nonlinear Optical (NLO) response of materials has been of great interest to the scientific community due to their potential applications in various fields (LaFratta et al, 2007; Spangler, 1999; Fisher et al, 1997; Zipfel, Williams & Webb, 2003; Helmchen & Denk, 2005; Parthenopoulos & Rentzepis, 1989; Kawata & Kawata, 2000; Lin et al, 2003)
Depending on the molecular property, one can get the order of magnitude difference in the two-photon absorption cross-section (TPACS) by the varying pulse width (Xu & Webb, 1996)
At high powers of the femtosecond laser pulse, CS2 exhibits Two-Photon Absorption (TPA). Both open aperture and close aperture Z-scan techniques were used for studying the influence of repetition rate on Nonlinear Refraction (NLR) and Two-photon absorption cross-section (TPACS) of the organic solvent
Summary
Over the past few decades, the characterization of Nonlinear Optical (NLO) response of materials has been of great interest to the scientific community due to their potential applications in various fields (LaFratta et al, 2007; Spangler, 1999; Fisher et al, 1997; Zipfel, Williams & Webb, 2003; Helmchen & Denk, 2005; Parthenopoulos & Rentzepis, 1989; Kawata & Kawata, 2000; Lin et al, 2003). Pulsed laser sources allow these nonlinear optical processes to occur at low laser power. Pulse width (Yi et al, 1998) and wavelength (Srinivas et al, 2001; Szeremeta et al, 2013) have demonstrated a great influence on the nonlinear properties like nonlinear refraction (Major et al, 2004), nonlinear absorption (Golubev et al, 2011), and nonlinear scattering (Clay, Wostyn & Persoons, 2002; Matcher, Cope & Delpy, 1997), depending on the properties of the target material. Depending on the molecular property, one can get the order of magnitude difference in the two-photon absorption cross-section (TPACS) by the varying pulse width (Xu & Webb, 1996)
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