Fig. 1.

a Schematic view of the probe with filters, lenses, and beam propagation cones. b Front view of the probe distal end. The fibers shown in blue are used for collecting the Raman scattering. The fiber shown in red is a 300-μm-core fiber that transmits the light for the Raman excitation. The fibers shown in green are 300-μm-core fibers for generating the FLIm signal. c Overview of the complete setup which was used for the bimodal FLIm and Raman acquisition