Measurements are made for a number of dual fiber optic configurations to determine their relative sensitivity using bare fibers and graded-refractive-index lenses. An analysis of the background fiber emission for a typical silica-on-silica fiber (Diaguide, 200-µm core) is presented, and the origin (core or cladding) for several prominent Raman peaks is determined. Also, a forward-scattering fiber geometry is introduced, and the dependence of sensitivity on the type of optical termination and fiber separation is determined.
© 1990 Optical Society of America
M. L. Myrick, Stanley M. Angel, and Russell Desiderio, "Comparison of some fiber optic configurations for measurement of luminescence and Raman scattering," Appl. Opt. 29, 1333-1344 (1990)