Post-processing ZnSe optical fibers with a micro-chemical vapor transport technique

Polycrystalline zinc selenide optical fibers and fiber lasers are expected to provide powerful capabilities for infrared waveguiding and laser technology. High pressure chemical vapor deposition, which is the only technique currently capable of producing zinc selenide optical fibers, leaves a geomet...

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Bibliographic Details
Published in:Optical materials express 2020-12, Vol.10 (12), p.3125
Main Authors: Hendrickson, Alex T., Aro, Stephen C., Sparks, Justin R., Coco, Michael G., Krug, James P., Mathewson, Carly J., McDaniel, Sean A., Sazio, Pier J., Cook, Gary, Gopalan, Venkatraman, Badding, John V.
Format: Article
Language:English
Subjects:
Chemical vapor deposition
Crystal defects
Fiber lasers
Grain growth
Grain size
Infrared lasers
Optical fibers
Polycrystals
Post-processing
Pressure gradients
Raman spectroscopy
Twinning
Waveguides
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Summary:Polycrystalline zinc selenide optical fibers and fiber lasers are expected to provide powerful capabilities for infrared waveguiding and laser technology. High pressure chemical vapor deposition, which is the only technique currently capable of producing zinc selenide optical fibers, leaves a geometric imperfection in the form of a central pore which is detrimental to mode quality. Chemical vapor transport with large temperature and pressure gradients not only fills this central pore but also encourages polycrystalline grain growth. Increased grain size and a reduction in defects such as twinning are demonstrated with transmission electron microscopy, Raman spectroscopy, and X-ray diffraction, supporting that high-quality material is produced from this method. Finally, the mode structure of the waveguide is improved allowing most of the guided optical intensity to be centrally positioned in the fiber core. Loss as low as 0.22 dB/cm at 1908nm is demonstrated as a result of the material improvement.
ISSN:2159-3930
2159-3930
DOI:10.1364/OME.404700