Abstract
This work proposes a facile approach to fabricate a dual-core hollow waveguide based on two common and low-cost raw materials, namely polytetrafluoroethylene (PTFE) tube and ultraviolet (UV) gel. A silica glass tube is nested inside a heat-shrinkable PTFE tube. After heat treatment at 350 °C, the PTFE tube shrinks and then transforms into the low-index polymer on the outside of the silica tube. The PTFE-coated silica glass tubing is filled with UV gel followed by inserting a typical Ag/AgI mid-infrared (IR) hollow optical fiber. The UV gel is cured by UV radiation, forming a solid low-index layer between the PTFE-coated silica glass tubing and the Ag/AgI hollow optical fiber. A visible laser beam can be transmitted at a loss of 0.4 dB/m through the silica annulus between the low-index PTFE and UV gel layer. A 10.6-μm-wavelength CO2 laser beam is delivered through the Ag/AgI hollow optical fiber (core size 530 μm) and the transmission loss goes up from 1.63 to 3.22 dB/m as the bending angle increases from 0° to 90°.
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This work was supported by the National Natural Science Foundation of China (NSFC) (Grant Nos. 61775060, 61275100, 61761136006 and 61790583).
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Yu, S., Sun, Z., Li, G. et al. Construction of a dual-core hollow waveguide for visible and mid-infrared light transmission based on PTFE tubing and UV gel. Opt Quant Electron 53, 214 (2021). https://doi.org/10.1007/s11082-021-02893-0
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DOI: https://doi.org/10.1007/s11082-021-02893-0