An interference filter laser Raman spectrometer has been assembled and tested. Sensitivity and linearity of response have been demonstrated for a number of gases, volatile liquids, and mixtures thereof. It has been demonstrated that the bread-board device will function with less than 1 W of laser power, with a consequent tradeoff in sensitivity. It is felt that this device has demonstrated the principles required for implementation of the design and construction of a prototype process control instrument.
Arieh M. Karger, Richard P. English, and Ray J. D. Smith, "Laser Raman Spectrometer for Process Control," Appl. Opt. 12, 2083-2087 (1973)