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Femtosecond spectral interferometry of optical activity: Theory
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View: Figures


Image of FIG. 1.
FIG. 1.

Experimental setup for FTSI, based on a Mach–Zehnder interferometer. The incident laser pulse is linearly polarized along the -axis before it enters into the sample cell. The second linear polarizer is placed after the cell to select the - or -polarized signal field. The reference pulse is - or -polarized and it precedes the signal field by a finite time .; BS, beam splitter; LP0–2, linear polarizers; MC, monochromator; Det, multichannel array detector.

Image of FIG. 2.
FIG. 2.

(a) Absorption spectrum of the model system. The three normal mode frequencies are assumed to be 2900, 2950, and . The corresponding dephasing constants are 0.006, 0.004, and , respectively. The relative dipole strengths determining the IR peak intensity are 1, 0.5, and 0.3, respectively. (b) The VCD spectrum. The relative rotational strengths are assumed to be , , and , respectively. (c) The Fourier-transformed spectrum of the reference pulse .

Image of FIG. 3.
FIG. 3.

(a) Normalized heterodyne-detected spectral interferograms of IR , (solid line) and VOA FID , and (dashed line) signal fields. Note that the relative magnitudes of the spectral interferograms for IR and VOA FID signals are about 1 and , respectively, before normalizing them. (b) Normalized time-domain interference signal amplitudes obtained by calculating . (c) The VCD (solid line, left scale) and VORD (dashed line, right scale) spectra retrieved from the spectral interferograms of IR and VOA FID signal fields.


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Scitation: Femtosecond spectral interferometry of optical activity: Theory