The development of advanced optical fibers for long-wave infrared transmission
Résumé
Long-wave IR fibers are used in an increasing no. of applications ranging from thermal imaging to bio-sensing. However, the design of optical fiber with low-loss in the far-IR requires a combination of properties including good rheol. characteristics for fiber drawing and low phonon energy for wide optical transparency, which are often mutually exclusive and can only be achieved through fine materials engineering. This paper presents strategies for obtaining low loss fibers in the far-IR based on telluride glasses. The compn. of the glasses is systematically investigated to obtained fibers with minimal losses. The fiber attenuation is shown to depend strongly on extrinsic impurity but also on intrinsic charge carrier populations in these low band-gap amorphous semiconductor materials.
Domaines
Matériaux
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