A recently developed technique to enhance spontaneous Raman scattering utilizing a highly reflective integrating cavity is presented. Elastically scattered light circulates within the cavity volume continuously interacting with the sample, whether a bulk sample or gas, resulting in significant Raman enhancement. In addition, the Raman scattered light is collected from all directions before being coupled out of the cavity. Enhancements of 107 have been realized with the use of inexpensive low power diode lasers and a modest CCD based spectrometer. Application of the iCERS technique operating near 400 nm providing near real-time detection and measurement of trace gases, chemicals, and biological compounds is discussed.
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Thomas Z. Moore, Vladislav V. Yakovlev, John D. Mason, Dawson T. Nodurft, Vincent Tedford, Edward S. Fry, Kristin A. Favela, "Chemical, biological, and trace gas detection and measurement with a newly developed integrating Cavity Enhanced Raman (iCERS) technique," Proc. SPIE 10657, Next-Generation Spectroscopic Technologies XI, 106570M (14 May 2018);