Abstract
Abstract Femtosecond laser machining has successfully been applied to develop for a spectroscopic sensing in multi-mode optical fibers by embedding through holes penetrating the fiber core, which could work to be a sample cell for spectroscopic measurements. In this report, the spectroscopic measurement using the pico-litter sample cell will be shown for liquid dye of Rhodamine 6G (R6G). Even with a single cell volume of 20 pL, the absorption spectra are appeared in the visible range centered at a wavelength of 530 nm corresponding to the peak absorption wavelength of R6G solutions.
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