vibrational motion of a molecule is intrinsically linked to its structure and composition, which provides a way to identify it. Raman spectroscopy, utilizing the inelastic scattering of light, investigates these molecular vibrations. While Raman shifts exceeding 200 cm−1 primarily capture intramolecular vibrations, lower Raman shifts ( < 200 cm−1) provide insights into the collective motion of molecules, thereby revealing valuable structural information. Although frequency domain imaging effectively addresses higher Raman shifts, a time domain approach proves more practical for lower Raman shifts. Impulsive Stimulated Raman Scattering (ISRS) is a time domain technique that employs a pump pulse to instantaneously excite a molecule, activating all modes within its bandwidth and inducing a transient refractive index modulation. This modulation can be probed by a second pulse, enabling analysis of spatial profile, spectrum, and polarization changes. In this study, we elucidate the implementation of transient vibrational refractive index detection for the acquisition of ultrafast hyperspectral images, including the integration of a random access delay line into the existing setup that enables scanning windows of up to 50 picoseconds at random time delays.
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