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Single crystal germanium core optical fibers produced via pressure assisted physical filling and CO2 laser recrystallization
Authors:
Guangrui
Li
(Friedrich-Schiller-University Jena)
,
Markus A.
Schmidt
(Friedrich-Schiller-University Jena)
,
Noel
Healy
(Newcastle University)
Co-authored by industrial partner:
No
Type:
Journal Paper
Journal:
Ieee Photonics Technology Letters
State:
Published (Approved)
Published:
December 2019
Diamond Proposal Number(s):
13025
Abstract: We present a simple two step process for the fabrication of single crystal germanium core optical fibers. The core material is deposited into a capillary in a highly polycrystalline state using the pressure assisted filling technique. The cores are then melted and recrystallized in single crystal form using a scanning CO2 laser process. This technique is far quicker than the high pressure chemical deposition technique and overcomes all of the oxygen in-diffusion issues associated with the molten core drawing technique. We produce small core fiber 1 lm radii and length in the cm regime. It is anticipated that this process can be be optimized so that sub-micron cores can be produced to create fibers that have single-mode operation.
Journal Keywords: Optical device fabrication; Optical signal processing; Optical diffraction; Crystals; Semiconductor lasers; Germanium
Subject Areas:
Physics,
Materials
Instruments:
I18-Microfocus Spectroscopy
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Technical Tags: