Ultrabroadband background-free coherent anti-Stokes Raman scattering microscopy based on a compact Er:fiber laser system.
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).
Selm
Romedi
R
University of Konstanz, Department of Chemistry, D-78457 Konstanz, Germany.
Winterhalder
Martin
M
Zumbusch
Andreas
A
Krauss
Günther
G
Hanke
Tobias
T
Sell
Alexander
A
Leitenstorfer
Alfred
A