The Experts below are selected from a list of 22026 Experts worldwide ranked by ideXlab platform
Nathalie Picque - One of the best experts on this subject based on the ideXlab platform.
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raman induced Kerr Effect dual comb spectroscopy
Optics Letters, 2012Co-Authors: Takuro Ideguchi, Birgitta Bernhardt, G Guelachvili, T W Hansch, Nathalie PicqueAbstract:We report on the first (to our knowledge) demonstration of nonlinear dual-frequency-comb spectroscopy. In multi-heterodyne femtosecond Raman-induced Kerr-Effect spectroscopy, the Raman gain resulting from the coherent excitation of molecular vibrations by a spectrally narrow pump is imprinted onto the femtosecond laser frequency comb probe spectrum. The birefringence signal induced by the nonlinear interaction of these beams and the sample is heterodyned against a frequency comb local oscillator with a repetition frequency slightly different from that of the comb probe. Such time-domain interference provides multiplex access to the phase and amplitude Raman spectra over a broad spectral bandwidth within a short measurement time.
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raman induced Kerr Effect dual comb spectroscopy
arXiv: Optics, 2012Co-Authors: Takuro Ideguchi, Birgitta Bernhardt, G Guelachvili, T W Hansch, Nathalie PicqueAbstract:We report on the first demonstration of nonlinear dual-frequency-comb spectroscopy. In multi-heterodyne femtosecond Raman-induced Kerr-Effect spectroscopy, the Raman gain resulting from the coherent excitation of molecular vibrations by a spectrally-narrow pump is imprinted onto the femtosecond laser frequency comb probe spectrum. The birefringence signal induced by the nonlinear interaction of these beams and the sample is heterodyned against a frequency comb local oscillator with a repetition frequency slightly different from that of the comb probe. Such time-domain interference provides multiplex access to the phase and amplitude Raman spectra over a broad spectral bandwidth within a short measurement time. Experimental demonstration, at a spectral resolution of 200 GHz, a measurement time of 293 {\mu}s and a sensitivity of 10^-6, is given on liquid samples exhibiting a C-H stretch Raman shift.
Philippe Emplit - One of the best experts on this subject based on the ideXlab platform.
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measuring the nonlinear refractive index of graphene using the optical Kerr Effect method
Optics Letters, 2016Co-Authors: Evdokia Dremetsika, Marie Blandine Martin, Pierre Seneor, Stephan Hofmann, Bruno Dlubak, Serge Massar, Daniel Dolfi, Charles Ciret, Simon-pierre Gorza, Philippe EmplitAbstract:By means of the ultrafast optical Kerr Effect method coupled to optical heterodyne detection (OHD-OKE), we characterize the third-order nonlinear response of graphene and compare it to experimental values obtained by the Z-scan method on the same samples. From these measurements, we estimate a negative nonlinear refractive index for monolayer graphene, n2=−1.1×10−13 m2/W. This is in contradiction to previously reported values, which leads us to compare our experimental measurements obtained by the OHD-OKE and the Z-scan method with theoretical and experimental values found in the literature and to discuss the discrepancies, taking into account parameters such as doping.
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Measuring the nonlinear refractive index of graphene using the optical Kerr Effect method
Optics Letters, 2016Co-Authors: Evdokia Dremetsika, Marie Blandine Martin, Pierre Seneor, Stephan Hofmann, Bruno Dlubak, Serge Massar, Daniel Dolfi, Charles Ciret, Simon-pierre Gorza, Philippe EmplitAbstract:By means of the ultrafast optical Kerr Effect method coupled to optical heterodyne detection (OHD-OKE), we characterize the third order nonlinear response of graphene at telecom wavelength, and compare it to experimental values obtained by the Z-scan method on the same samples. From these measurements, we estimate a negative nonlinear refractive index for monolayer graphene, $n_2 = - 1.1\times 10^{-13} m^2/W$. This is in contradiction to previously reported values, which leads us to compare our experimental measurements obtained by the OHD-OKE and the Z-scan method with theoretical and experimental values found in the literature, and to discuss the discrepancies, taking into account parameters such as doping.
Takuro Ideguchi - One of the best experts on this subject based on the ideXlab platform.
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raman induced Kerr Effect dual comb spectroscopy
Optics Letters, 2012Co-Authors: Takuro Ideguchi, Birgitta Bernhardt, G Guelachvili, T W Hansch, Nathalie PicqueAbstract:We report on the first (to our knowledge) demonstration of nonlinear dual-frequency-comb spectroscopy. In multi-heterodyne femtosecond Raman-induced Kerr-Effect spectroscopy, the Raman gain resulting from the coherent excitation of molecular vibrations by a spectrally narrow pump is imprinted onto the femtosecond laser frequency comb probe spectrum. The birefringence signal induced by the nonlinear interaction of these beams and the sample is heterodyned against a frequency comb local oscillator with a repetition frequency slightly different from that of the comb probe. Such time-domain interference provides multiplex access to the phase and amplitude Raman spectra over a broad spectral bandwidth within a short measurement time.
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raman induced Kerr Effect dual comb spectroscopy
arXiv: Optics, 2012Co-Authors: Takuro Ideguchi, Birgitta Bernhardt, G Guelachvili, T W Hansch, Nathalie PicqueAbstract:We report on the first demonstration of nonlinear dual-frequency-comb spectroscopy. In multi-heterodyne femtosecond Raman-induced Kerr-Effect spectroscopy, the Raman gain resulting from the coherent excitation of molecular vibrations by a spectrally-narrow pump is imprinted onto the femtosecond laser frequency comb probe spectrum. The birefringence signal induced by the nonlinear interaction of these beams and the sample is heterodyned against a frequency comb local oscillator with a repetition frequency slightly different from that of the comb probe. Such time-domain interference provides multiplex access to the phase and amplitude Raman spectra over a broad spectral bandwidth within a short measurement time. Experimental demonstration, at a spectral resolution of 200 GHz, a measurement time of 293 {\mu}s and a sensitivity of 10^-6, is given on liquid samples exhibiting a C-H stretch Raman shift.
Evdokia Dremetsika - One of the best experts on this subject based on the ideXlab platform.
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measuring the nonlinear refractive index of graphene using the optical Kerr Effect method
Optics Letters, 2016Co-Authors: Evdokia Dremetsika, Marie Blandine Martin, Pierre Seneor, Stephan Hofmann, Bruno Dlubak, Serge Massar, Daniel Dolfi, Charles Ciret, Simon-pierre Gorza, Philippe EmplitAbstract:By means of the ultrafast optical Kerr Effect method coupled to optical heterodyne detection (OHD-OKE), we characterize the third-order nonlinear response of graphene and compare it to experimental values obtained by the Z-scan method on the same samples. From these measurements, we estimate a negative nonlinear refractive index for monolayer graphene, n2=−1.1×10−13 m2/W. This is in contradiction to previously reported values, which leads us to compare our experimental measurements obtained by the OHD-OKE and the Z-scan method with theoretical and experimental values found in the literature and to discuss the discrepancies, taking into account parameters such as doping.
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Measuring the nonlinear refractive index of graphene using the optical Kerr Effect method
Optics Letters, 2016Co-Authors: Evdokia Dremetsika, Marie Blandine Martin, Pierre Seneor, Stephan Hofmann, Bruno Dlubak, Serge Massar, Daniel Dolfi, Charles Ciret, Simon-pierre Gorza, Philippe EmplitAbstract:By means of the ultrafast optical Kerr Effect method coupled to optical heterodyne detection (OHD-OKE), we characterize the third order nonlinear response of graphene at telecom wavelength, and compare it to experimental values obtained by the Z-scan method on the same samples. From these measurements, we estimate a negative nonlinear refractive index for monolayer graphene, $n_2 = - 1.1\times 10^{-13} m^2/W$. This is in contradiction to previously reported values, which leads us to compare our experimental measurements obtained by the OHD-OKE and the Z-scan method with theoretical and experimental values found in the literature, and to discuss the discrepancies, taking into account parameters such as doping.
Edward L Quitevis - One of the best experts on this subject based on the ideXlab platform.
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nanostructural organization and anion Effects in the optical Kerr Effect spectra of binary ionic liquid mixtures
Journal of Physical Chemistry B, 2008Co-Authors: Dong Xiao, Justin Rajesh Rajian, Larry G Hines, Richard A Bartsch, Edward L QuitevisAbstract:This article reports a study of the Effect of anions on the optical Kerr Effect (OKE) spectra of binary ionic liquid mixtures with one mixture comprising the 3-methyl-1-pentylimidazolium ([C5mim]+) cation and the anions PF6− and CF3CO2− (TFA−), and another mixture comprising the [C5mim]+ cation and the anions Br− and bis(trifluomethanesulfonyl)imide (NTf2−). The spectra were obtained by the use of optical heterodyne-detected Raman-induced Kerr Effect Spectroscopy at 295 K. The OKE spectra of the mixtures are compared with the calculated mole-fraction weighted sum of the normalized OKE spectra of the neat liquids. The OKE spectra are nearly additive for [C5mim]Br/[C5mim][NTf2] mixtures, but nonadditive for [C5mim][PF6]/[C5mim][TFA] mixtures. In the case of the equimolar [C5mim][PF6]/[C5mim][TFA] mixture, the nonadditivity is such that the experimental OKE spectrum is narrower than the calculated OKE spectrum. The additivity or nonadditivity of OKE spectra for IL mixtures can be explained by assuming ionic ...
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reorientational and intermolecular dynamics in binary liquid mixtures of hexafluorobenzene and benzene femtosecond optical Kerr Effect measurements
Chemical Physics Letters, 1997Co-Authors: Manickam Neelakandan, Debi D Pant, Edward L QuitevisAbstract:Abstract The molecular dynamics of binary liquid mixtures of C 6 F 6 and C 6 H 6 were studied by using optical heterodyne-detected Raman-induced Kerr Effect spectroscopy (OHD-RIKES) with 45 fs laser pulses at room temperature and ambient pressure. The data give evidence for the Effect of interspecies interactions in the short-time, nondiffusive part of the OHD-RIKES response.
