Fiber-in-line infrared spectrometer fabricated by femtosecond laser structuring of microchannels in fluoride glass fiber

Abstract

In this study, we developed a fiber-in-line infrared spectrometer using fluoride-glass fiber and evaluated its measurement performance. In the fabrication process, a sensor structure functioning as a sample cell for spectroscopic measurements was created in the fiber waveguide by femtosecond laser processing. Measurements of water–glucose samples confirmed the sensor’s ability to obtain transmission spectra, allowing the absorption characteristics of the samples to be determined. The decrease in transmittance at the absorption wavelength of water and glucose confirms the feasibility of an optical fiber in-line infrared absorption spectroscopy measurement system.journal articl