Abstract
Stimulated Raman scattering spectroscopy enables label-free molecular identification, but its broadband implementation is technically challenging. We experimentally demonstrate a novel approach to multiplex stimulated Raman scattering based on photonic time stretch. A telecom fiber stretches the broadband femtosecond Stokes pulse after the sample to ∼15ns, mapping its spectrum in time. The signal is sampled through a fast oscilloscope, providing single-shot spectra at 80-kHz rate. We demonstrate high sensitivity in detecting the Raman vibrational modes of various samples over the entire high-frequency C-H stretching region. Our results pave the way to high-speed broadband vibrational imaging for materials science and biophotonics.
Highlights
Raman spectroscopy allows for label-free identification of molecules, retrieving their characteristic vibrational fingerprints
We experimentally demonstrate a novel approach to multiplex stimulated Raman scattering based on photonic time stretch
The signal is sampled through a fast oscilloscope, providing single-shot spectra at 80-kHz rate
Summary
Raman spectroscopy allows for label-free identification of molecules, retrieving their characteristic vibrational fingerprints. It finds applications in many disciplines, such as biomedical sciences [1]. Stimulated Raman Scattering (SRS) is a CRS technique requiring two ultrashort laser pulses (called pump and Stokes). Combining a narrowband (picosecond) pump with a broadband (femtosecond) Stokes, on the other hand, it is possible to retrieve the full Raman spectrum at once. In this configuration, called broadband or multiplex SRS, it is technically challenging to push the acquisition speed below a millisecond per pixel (or voxel). In recent years, there has been a great effort in speeding up the acquisition time of multiplex SRS [3]
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