High-sensitivity frequency modulation CARS with a compact and fast tunable fiber-based light source

Thomas Wurthwein*, Maximilian Brinkmann, Tim Hellwig, Kristin Wallmeier, Carsten Fallnich

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

4 Citations (Scopus)


Frequency modulation (FM) coherent anti-Stokes Raman scattering (CARS) is presented, using a compact as well as fast and widely tunable fiber-based light source. With this light source, Raman resonances between 700 cm-1 and 3200 cm-1 can be addressed via wavelength tuning within only 5 ms, which allows forFMCARS measurements with frame-to-frame wavelength switching. Moreover, the functionality for high-sensitivity FM CARS measurements was integrated by means of fiber optics to keep a stable and reliable operation. The light source accomplishedFMCARS measurements with a 40 times enhanced sensitivity at a lock-in amplifier (LIA) bandwidth of 1 Hz. For fast imaging with frame-to-frame wavelength switching at a LIA bandwidth of 1 MHz, an 18-fold contrast enhancement could be verified, making this light source ideal for routine and out-of-lab FM CARSmeasurements for medical diagnostics or environmental sensing.

Original languageEnglish
Pages (from-to)3544-3547
Number of pages4
JournalOptics letters
Issue number15
Early online date21 Jul 2021
Publication statusPublished - 1 Aug 2021


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