Recent progress in germanium-core optical fibers for mid-infrared optics

AbstractThis article presents a review of optical-fiber-based process-monitoring techniques that can be used to track the chemical reactions that take place during the processing of materials, with specific reference to thermosetting resins. The techniques covered include quantitative process-monitoring methods based on near and mid-infrared, Raman, UV–visible, evanescent wave, and fluorescence spectroscopy. The basis for refractive-index-based process monitoring using optical fibers is also presented. The techniques described here can be readily applied to other classes of materials and other areas of interest such as aging and degradation. Recent advances in noncontact process monitoring are also presented.

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New fluoroindate glass compositions

Journal of Materials Research ◽

10.1557/jmr.1993.0885 ◽

1993 ◽

Vol 8 (4) ◽

pp. 885-889 ◽

Cited By ~ 35

Author(s):

Y. Messaddeq ◽

A. Delben ◽

M.A. Aegerter ◽

A. Soufiane ◽

M. Poulain

Keyword(s):

Optical Fibers ◽

Glass Formation ◽

Laser Wavelength ◽

Infrared Range ◽

Mid Infrared ◽

Co Laser ◽

Glass Stability ◽

Wavelength Emission ◽

Transmission Edge ◽

Glass Compositions

The limits of glass formation of new fluoroindate glass compositions have been determined for the basic systems InF3–BaF2–GdF3−20ZnF2−20SrF2–2XFn where × = Na, La and InF3–BaF2−20ZnF2−20SrF2−2GdF3–XFn, where × = Ca and Y. The incorporation of small amounts of GaF3 and/or GdF3 increases strongly the thermal glass stability. All the fluoroindate compositions studied are highly transparent in the mid-infrared range; their transmission edge is shifted beyond 7 μm and the theoretical attenuation coefficient, extrapolated at the CO laser wavelength emission, is typically α = 100 dB/km. Large bulks and preforms have been prepared allowing the drawing of optical fibers.

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Chalcogenide Microstructured Optical Fibers for Mid-Infrared Supercontinuum Generation: Interest, Fabrication, and Applications

Applied Sciences ◽

10.3390/app8091637 ◽

2018 ◽

Vol 8 (9) ◽

pp. 1637 ◽

Cited By ~ 8

Author(s):

Yiming Wu ◽

Marcello Meneghetti ◽

Johann Troles ◽

Jean-Luc Adam

Keyword(s):

Optical Fibers ◽

Infrared Imaging ◽

Supercontinuum Generation ◽

Mid Infrared ◽

Microstructured Fibers ◽

Research Fields ◽

Infrared Spectral ◽

Purification Methods ◽

Imaging And Spectroscopy ◽

High Coherence

The mid-infrared spectral region is of great technical and scientific importance in a variety of research fields and applications. Among these studies, mid-infrared supercontinuum generation has attracted strong interest in the last decade, because of unique properties such as broad wavelength coverage and high coherence, among others. In this paper, the intrinsic optical properties of different types of glasses and fibers are presented. It turns out that microstructured chalcogenide fibers are ideal choices for the generation of mid-infrared supercontinua. The fabrication procedures of chalcogenide microstructured fibers are introduced, including purification methods of the glass, rod synthesis processes, and preform realization techniques. In addition, supercontinua generated in chalcogenide microstructured fibers employing diverse pump sources and configurations are enumerated. Finally, the potential of supercontinua for applications in mid-infrared imaging and spectroscopy is shown.

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