Raman is a form of vibrational spectroscopy that measures the interaction of light with matter. In modern Raman instruments, laser light is used as the source and focused on a sample, the interaction causes atoms in molecules to vibrate, and the Raman scattered light is collected, and dispersed onto a detector. The Raman signal provides a unique molecular fingerprint of the material which is related to the chemical structure and physical state of sample. The most popular application is using this molecular fingerprint for material identification and qualification of materials . Samples identified by Raman spectroscopy includes many organic and inorganic substances where rapid and accurate testing is required. This can include plastics, pharmaceutical, food, agriculture, law enforcement and military. Applications include raw material/feedstock identification and qualification, sorting for recycling, gem and mineral identification, hazardous material testing (explosives and toxic chemicals), and narcotic testing, among others. These materials are measured in many forms including solids, liquids, emulsions, and gases. Modern systems are much smaller and allow measurements to be performed in the field.