Broadband impulsive stimulated Raman spectroscopy: A fluorescence-background-free alternative to conventional Raman spectroscopy
摘要
Impulsive stimulated Raman spectroscopy using a chirped broadband probe pulse (broadband ISRS) has attracted significant attention due to its numerous advantages over spontaneous Raman spectroscopy, stimulated Raman spectroscopy (SRS), and ISRS with a probe pulse spectrally degenerate with the Raman pump pulse (degenerate ISRS). In this article, we present a non-mathematical perspective on ISRS, covering its machinery and applications. In particular, we demonstrate how broadband ISRS can extract a tiny Raman signal from a strong fluorescence background, both having the same Stokes shift.
Graphical abstractThe usefulness of broadband impulsive stimulated Raman spectroscopy over conventional approaches for isolating a feeble Raman signal with the same Stokes shift as a strong fluorescence background is demonstrated.