Frequency modulation stimulated Raman scattering scheme for real-time background correction with a single light source.
Kristin Wallmeier, Thomas Würthwein, Nick Lemberger, Maximilian Brinkmann, Tim Hellwig, Carsten Fallnich
Author Information
Kristin Wallmeier: University of Münster , Institute of Applied Physics, Corrensstraße 2, 48149 Münster, Germany.
Thomas Würthwein: University of Münster , Institute of Applied Physics, Corrensstraße 2, 48149 Münster, Germany. ORCID
Nick Lemberger: University of Münster , Institute of Applied Physics, Corrensstraße 2, 48149 Münster, Germany.
Maximilian Brinkmann: Refined Laser Systems GmbH, Mendelstraße 11, 48149 Münster, Germany.
Tim Hellwig: Refined Laser Systems GmbH, Mendelstraße 11, 48149 Münster, Germany.
Carsten Fallnich: University of Münster , Institute of Applied Physics, Corrensstraße 2, 48149 Münster, Germany. ORCID
A frequency modulation (FM) scheme for stimulated Raman scattering (SRS) is presented with a single fiber-based light source. Pulse-to-pulse wavelength-switching allows real-time subtraction of parasitic signals leaving only the resonant SRS signal with a noise reduction of up to 30 % compared to digital subtraction schemes, leading effectively to a contrast improvement by a factor of up to 8.3. The wide tuning range of the light source from 1500 cm to 3000 cm and the possibility to separately adjust the resonant and the nonresonant wavenumber for every specimen allow to investigate a variety of samples with high contrast and high signal-to-noise ratio, e. g., for medical diagnostics.
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