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Spectral focusing: High spectral resolution spectroscopy with broad-bandwidth laser pulses
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View: Figures


Image of FIG. 1.
FIG. 1.

Top: Experimental setup. G: grating, L: lens, BC: beam combiner. Left below: A schematic drawing of the CARS process is given. Right below: The principle of addressing different vibrational levels by changing the temporal delay between pulses is depicted.

Image of FIG. 2.
FIG. 2.

CARS cross correlation recorded without (grey curve A, scaled by a factor of 0.4) and with (black curve B) nitroprusside in the probed volume. A featureless spectrum is observed in curve A, whereas two peaks and a small shoulder can be distinguished in the spectrum collected on a nitroprusside area. In the inset, the spontaneous Raman spectrum is displayed for comparison. The CARS cross correlation corresponds to a Raman spectrum.

Image of FIG. 3.
FIG. 3.

CARS images of nitroprusside microcrystallites surrounded by . The same area is scanned off (a) and in (b) resonance with the vibration. To suppress intensity overflow, the resonant image is scaled with a factor of 0.18 in (b). The squares indicate the locations at which the cross correlation traces in Fig. 2 were recorded. Intensity profiles along the arrows are shown below (grey curve A: nonresonant, black curve B: resonant).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Spectral focusing: High spectral resolution spectroscopy with broad-bandwidth laser pulses