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Coherent anti‐Stokes Raman micro‐spectroscopy using spectral focusing: theory and experiment
Author(s) -
Langbein Wolfgang,
RochaMendoza Israel,
Borri Paola
Publication year - 2009
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.2264
Subject(s) - femtosecond , chirp , raman spectroscopy , coherent anti stokes raman spectroscopy , laser , optics , raman scattering , dispersion (optics) , spectral resolution , resolution (logic) , ultrashort pulse , fourier transform , coherent spectroscopy , chemistry , materials science , physics , spectral line , quantum mechanics , artificial intelligence , computer science
Coherent anti‐Stokes Raman scattering (CARS) microscopy using linearly chirped femtosecond laser pulses and spectrally and time‐integrated detection is discussed both theoretically and experimentally. By matching the linear chirp of Stokes and pump pulses, the spectral resolution is reduced to the Fourier limit of the chirped pulse duration (spectral focusing). We discuss the effect of the time‐ordering of Pump and Stokes pulses on the signal strength and selectivity, and give analytical expressions for the relevant quantities. We consider linear chirp obtained by glass elements of known group‐velocity dispersion, and analyze the limit of the spectral resolution by higher order glass dispersion. Experiments corroborating the theory are presented, using 100 fs laser pulses, SF57 glass elements, and polystyrene beads as test samples. Copyright © 2009 John Wiley & Sons, Ltd.