Low-loss single-mode guidance in large-core antiresonant hollow-core fibers

in: Optics Letters (2015)
Hartung, Alexander; Kobelke, Jens; Schwuchow, Anka; Bierlich, Jörg; Popp, Jürgen; Schmidt, Markus A.; Frosch, Torsten
We present an approach how to combine large mode field diameters with effective single-mode guidance in a hollow-core antiresonant optical fiber. We demonstrate experimentally and in simulations that single-mode guidance is achieved in a simplified hollow-core fiber design with a core diameter of 30 μm by shifting the effective indices of the first cladding modes close to those of higher-order core modes. Our fiber shows low loss propagation and effective single-mode Operation from the near infrared to deep ultraviolet wavelengths down to 270 nm on a loss level of approximately 3dB/m.

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