Abstract
Cavities are widely used in spectroscopy, for example to increase the absorption path and thus the detection sensitivity. With the advent of Hollow Core Photonic Crystal Fibers (HCPCF) it became possible to realize long absorption paths by using long fibres and, moreover, providing high electric field strength due to the small core diameters. In the recent past these fibres have been used to demonstrate saturation spectroscopy of acetylene [1] or stimulated Raman scattering in hydrogen [2].
© 2009 IEEE
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