In this contribution I will introduce the idea of performing noise correlation spectroscopy (NCS) experiments with ultrashort light pulses, in order to address the dynamical response of low energy Raman active modes in complex materials. The central idea of NCS is to use stimulated Raman processes to imprint in the ultrashort light pulses correlation between different spectral components. In appropriate conditions, stimulated Raman processes can amplify the intrinsic noise which characterizes ultrashort light pulses at frequencies whose difference is resonant to the phonon mode. By repeated measurements of the noise correlation between different spectral component introduced by the interaction between ultrashort light pulses and a sample, we will be able to retrieve the Raman response of materials. We are confident that NCS will provide a useful tool to address the Raman modes in real materials. We stress that should NCS become viable, it will provide the possibility of measuring the Raman response in matter on a timescale solely limited by the pulse duration. This would open new perspectives for non-equilibrium studies of electronic and vibrational degrees of freedom in complex materials.
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