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.
|Number of pages||4|
|Early online date||21 Jul 2021|
|Publication status||Published - 1 Aug 2021|
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