Stimulated Raman scattering spectroscopy is a powerful technique for label-free molecular identification, but its broadband implementation is technically challenging. We introduce and experimentally demonstrate a novel approach based on photonic time stretch. The broadband femtosecond Stokes pulse, after interacting with the sample, is stretched by a telecom fiber to ≈15ns, mapping its spectrum in time. The signal is sampled through a fast analog-to-digital converter, providing single-shot spectra at 80-kHz rate. We demonstrate ≈10-5 sensitivity over ≈500cm-1 in the C-H region. Our results pave the way to high-speed broadband vibrational imaging for materials science and biophotonics.

Broadband stimulated Raman scattering spectroscopy by a photonic time stretcher

KUMAR, VIKAS;VIOLA, DANIELE;CRISAFI, FRANCESCO;PREDA, FABRIZIO;CERULLO, GIULIO NICOLA;POLLI, DARIO
2016

Abstract

Stimulated Raman scattering spectroscopy is a powerful technique for label-free molecular identification, but its broadband implementation is technically challenging. We introduce and experimentally demonstrate a novel approach based on photonic time stretch. The broadband femtosecond Stokes pulse, after interacting with the sample, is stretched by a telecom fiber to ≈15ns, mapping its spectrum in time. The signal is sampled through a fast analog-to-digital converter, providing single-shot spectra at 80-kHz rate. We demonstrate ≈10-5 sensitivity over ≈500cm-1 in the C-H region. Our results pave the way to high-speed broadband vibrational imaging for materials science and biophotonics.
Atomic and Molecular Physics, and Optics
Scattering, stimulated Raman; Spectroscopy, Raman; Ultrafast spectroscopy; Fiber optics.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11311/999184
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