 A Raman microscope begins with a standard optical microscope, and adds an excitation laser, a monochromator or polychromator, and a sensitive detector (such as a charge-coupled device (CCD), or photomultiplier tube (PMT)).FT-Raman has also been used with microscopes, typically in combination with near-infrared (NIR) laser excitation.Ultraviolet microscopes and UV enhanced optics must be used when a UV laser source is used for Raman microspectroscopy.