Raman spectra of a plastic block taken at different exposure times ranging from 1 second to 2 minutes (range in images shown is 1 to 30 seconds). Increasing exposure time reduced noise but also increased background. Spectra was collected with the oil objective and the block in direct contact with the objective, so changing depth was not an option. I also looked at how the spectra looked using the full CCD (fvb) and a subset corresponding to an individual fiber from the bundle (mt).
