Stimulated Raman scattering was accidentally discovered by Woodbury and Ng in 1962 [7.1]. In studying Q-switching of a ruby laser by a nitrobenzene Kerr cell, they detected intense infrared radiation emitted from the Kerr cell, whose origin was not immediately identified. Eckhardt [7.2] first proposed the correct interpretation as stimulated Raman emissions from nitrobenzene; this was soon thereafter verified experimentally by Eckhardt et al. [7.3].