title: Ultrabroadband background-free coherent anti-Stokes Raman scattering microscopy based on a compact Er:fiber laser system.
abstract: We demonstrate a scheme for efficient coherent anti-Stokes Raman scattering (CARS) microscopy free of nonresonant background. Our method is based on a compact Er:fiber laser source. Impulsive excitation of molecular resonances is achieved by an 11 fs pulse at 1210 nm. Broadband excitation gives access to molecular resonances from 0 cm(-1) up to 4000 cm(-1). Time-delayed narrowband probing at 775 nm enables sensitive and high-speed spectral detection of the CARS signal free of nonresonant background with a resolution of 10 cm(-1).
authors.affiliation: University of Konstanz, Department of Chemistry, D-78457 Konstanz, Germany.
authors.forename: Romedi
authors.initials: R
authors.lastname: Selm
authors.forename: Martin
authors.initials: M
authors.lastname: Winterhalder
authors.forename: Andreas
authors.initials: A
authors.lastname: Zumbusch
authors.forename: Günther
authors.initials: G
authors.lastname: Krauss
authors.forename: Tobias
authors.initials: T
authors.lastname: Hanke
authors.forename: Alexander
authors.initials: A
authors.lastname: Sell
authors.forename: Alfred
authors.initials: A
authors.lastname: Leitenstorfer