Abstract
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.
Highlights
The search for supercontinuum (SC) sources reaching into the mid-infrared region has drawn much attention in recent years
Several other alternative materials were selected for the realization of Mid-IR SC generation, some of which are soft glasses such as tellurite [6,7], fluoride glasses [8,9], and chalcogenide glasses (ChG) [10,11,12]
Sci. 2018, 8, 1637 and chalcogenide photonic crystal fiber (PCF) are described, and examples of Mid-IR supercontinua generated from these fibers and applications are presented
Summary
The search for supercontinuum (SC) sources reaching into the mid-infrared (mid-IR) region (which covers the 2–20 μm electromagnetic spectral range) has drawn much attention in recent years This is mainly because the atmospheric transparent windows (3–5 μm and 8–12 μm) and the molecular fingerprint region are included in this range. Optical transmissions of different fibers are compared, and the advantages of chalcogenide photonic crystal fiber (PCF) for generating Mid-IR supercontinua are introduced and. Sci. 2018, 8, 1637 and chalcogenide PCF are described, and examples of Mid-IR supercontinua generated from these fibers and applications are presented. Why Choose Chalcogenide Microstructured Optical Fibers for Mid-Infrared Supercontinuum examples of Mid-IR supercontinua generated from these fibers and applications are presented. For the of supercontinua in pump the Mid-IR region, the gain medium orsorts the conversion fibers, which are passive fibers and active fibers, respectively.
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