Development Principle of Imageguide for Raman Spectroscopy by Hollow Light Guiding

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A hollow fiber image bundle for Raman spectral imaging was designed and fabricated. Theoretical loss calculations indicated image bundles with over 250 pixels were feasible without significant increase in transmission loss. In fabrication, a glass capillary bundle with a honeycomb cross-section was formed by the stack-and-draw method, and a silver thin film was deposited on the inner surface of the bundle by silver plating technique. Raman images of 10 um polymer beads were observed by using flexible Raman imaging system which consisted of fabricated hollow fiber image bundle and the thin film tunable filter based direct Raman imaging setup.