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Coherent Raman spectroscopy with a fiber‐format femtosecond oscillator
Author(s) -
Kumar Vikas,
Casella Michele,
Molotokaite Egle,
Polli Dario,
Cerullo Giulio,
Marangoni Marco
Publication year - 2012
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.3160
Subject(s) - femtosecond , raman spectroscopy , picosecond , raman scattering , coherent anti stokes raman spectroscopy , optics , materials science , spectroscopy , optoelectronics , bandwidth (computing) , laser , physics , computer science , telecommunications , quantum mechanics
We report on the recent development of a new technological approach for coherent Raman spectroscopy/microscopy based on spectral compression of femtosecond pulses emitted by an amplified multiple‐branch Er:fiber oscillator. Spectral compression is achieved by group‐velocity mismatched second‐harmonic generation in periodically poled nonlinear crystals, and it allows efficient synthesis of multiple synchronized narrow‐bandwidth picosecond pulses with frequency difference continuously tunable from 1000 to 3500 cm −1 . The system offers performances close to the current state of the art both for coherent anti‐Stokes Raman scattering (CARS) and for stimulated Raman scattering (SRS), but with significant advantages in terms of compactness and versatility. In fact, several configurations can be easily implemented, including multiplex CARS, two‐color imaging and nonresonant background suppression in CARS. Copyright © 2012 John Wiley & Sons, Ltd.