High-sensitivity frequency modulation CARS with a compact and fast tunable fiber-based light source
Abstract
Frequency modulation coherent anti-Stokes Raman scattering (FM 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 and 3200 cm can be addressed via wavelength tuning within only 5 ms, which allows for FM CARS 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 accomplished FM CARS 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 a 18-fold contrast enhancement could be verified, making this light source ideal for routine and out-of-lab FM CARS measurements for medical diagnostics or environmental sensing.
Cite
@article{arxiv.2103.12625,
title = {High-sensitivity frequency modulation CARS with a compact and fast tunable fiber-based light source},
author = {Thomas Würthwein and Maximilian Brinkmann and Tim Hellwig and Kristin Wallmeier and Carsten Fallnich},
journal= {arXiv preprint arXiv:2103.12625},
year = {2021}
}