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In-line interferometric femtosecond stimulated Raman scattering spectroscopy
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10.1063/1.4811486
/content/aip/journal/jcp/138/24/10.1063/1.4811486
http://aip.metastore.ingenta.com/content/aip/journal/jcp/138/24/10.1063/1.4811486

Figures

Image of FIG. 1.
FIG. 1.

Schematic sketch of the FSRS scheme (for details see text).

Image of FIG. 2.
FIG. 2.

(a) Schematic experimental setup. ND: Neutral density filter, Pol : Polarizer, QWP : Quarter-wave plate, HWP: Half-wave plate, DM: Dichroic mirror, MO: Microscope objective, Spec: Spectrometer. (b) Schematic sketch of the II-FSRS scheme. (c) The inset shows the polarization orientations of the pump and probe pulse components in the sample (for details see text).

Image of FIG. 3.
FIG. 3.

Measured spontaneous Raman scattering spectrum of acetonitrile.

Image of FIG. 4.
FIG. 4.

FSRS measurement of acetonitrile: reference spectrum (cyan-dashed curve) and the SRS modulated spectrum (blue curve) showing a small dip at 2921 cm. The difference (red curve) corresponds to an inverted Raman intensity spectrum.

Image of FIG. 5.
FIG. 5.

FRIKES measurement of acetonitrile: reference spectrum (cyan-dashed curve) and the SRS modulated spectrum (blue curve) showing a strong peak on top of a broad background signal. The difference (red curve) corresponds to a Raman intensity spectrum.

Image of FIG. 6.
FIG. 6.

(a) Incident probe pulse spectrum (blue curve) and transmitted reference spectrum behind Pol3 (red curve) in the II-FSRS setup on a logarithmic scale. (b) Retardation error, normalized to a retardation of λ/4, of the experimental system calculated from (a) according to Eq. (9) .

Image of FIG. 7.
FIG. 7.

(a) Measured II-FSRS spectrum dependent on the pump pulse polarization, (b) the same measurement subtracted by reference measurement (red curve from Fig. 6(a) ) and (c) corresponding calculation according to Eq. (8) . The arrows in (b) and (c) indicate the pump polarization angle.

Image of FIG. 8.
FIG. 8.

Measured and calculated II-FSRS spectra at pump pulse polarization angle of (a) 0° (≡180°), (b) 90°, (c) 45°, and (d) 135°.

Image of FIG. 9.
FIG. 9.

Comparison of the different spectroscopy methods. The FSRS, FRIKES, and II-FSRS spectra were obtained with the same pulse parameters, only with different polarization orientations, as indicated by the arrows. The retrieved nonlinear susceptibility χ is shown in the plot below, together with the independently measured spontaneous Raman spectrum for comparison.

Tables

Generic image for table
Table I.

Waveplate and polarizer orientations (in degrees, with respect to axis) for the different schemes, * = not inserted, RL: Raman loss, RG: Raman gain, DL: dispersive lineshape.

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/content/aip/journal/jcp/138/24/10.1063/1.4811486
2013-06-26
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: In-line interferometric femtosecond stimulated Raman scattering spectroscopy
http://aip.metastore.ingenta.com/content/aip/journal/jcp/138/24/10.1063/1.4811486
10.1063/1.4811486
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