Figure 1.

(a) Raman signals obtained via multiple scattering. The diagram shows a schematic representation where Raman photons can be obtained at any geometry regardless of the point of excitation. The excitation can be made either using an input fiber optic or a free laser beam, and (b) Schematic representation of the UMARS experimental set-up. For clarity, only one collection fiber is shown in the diagram. In the actual experiment, upto10 collection fibers terminate in a linear array in front of the spectrometer slit.