Source: http://proxy.osapublishing.org/oe/abstract.cfm?uri=oe-20-10-11153
Timestamp: 2019-04-25 06:43:47+00:00

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We describe a silica hollow-core fiber for mid-infrared transmission with a minimum attenuation of 34 dB/km at 3050 nm wavelength. The design is based on the use of a negative curvature core wall. Similar fiber designed for longer wavelengths has a transmission band extending beyond 4 µm.
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Fig. 1 Scanning electron micrograph of a hollow fiber with negative curvature of the core wall. The core diameter is 94 µm and the average strut thickness around the core is 2.66 µm.
Fig. 2 Measured attenuation spectrum. No transmitted signal could be recorded in either of the high loss regions. Inset: transmission spectrum through 83 m fiber (blue) and transmitted HeNe laser spectrum (red, 0.5 nm resolution) through 78 m of fiber.
Fig. 3 Comparison between fiber transmission spectrum (blue) and HCl absorption (red) .
Fig. 4 Results of the mode-field experiment using linear and logarithmic scales. The data shown were recorded at a wavelength of 3.15 µm. The core diameter is 94 μm.
Fig. 5 Bend loss measurements. Light from a tungsten halogen lamp is coupled into 2.3 m fiber and the output spectrum is measured with monochromator. The middle of fiber is bent in a half circle of different diameters D and both ends are kept straight as shown in the inset.
Fig. 6 Transmitted spectrum through 7 meters of fiber with 108 µm core, with dashed line representing the theoretical resonant (high-loss) wavelength. The OH absorption lines are unresolved in this 10 nm resolution scan.

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