Abstract

UV guiding fibers are highly sought after in laser and spectroscopy applications. Recent advances in hollow-core fiber orient a practical approach for proper UV light delivery sustainable to high-power and long-term irradiation. In this Letter, we report two types of hollow-core negative-curvature fibers (NCFs) in a UV spectral range. Their structures consist of one ring of six small (7.9 μm in diameter) and four big (20.8 μm in diameter) tubes, enclosing a hollow core of similar size ($\sim 15\mathrm{\mu m}$ in diameter). The six-tube NCF shows an attenuation level of $0.13\pm 0.01\mathrm{dB}/\mathrm{m}$ at 300 nm. It is capable of delivering 20 ps, 160 μJ pulses at 355 nm with no damage to the fiber facet. The novel four-tube NCF exhibits an attenuation level of $\sim 0.3\pm 0.15\mathrm{dB}/\mathrm{m}$ at 355 nm. Its fundamental core mode is guided in an intentionally designed “cladding mode mismatching” region. This four-tube design possesses a high degree of down-scalability for deep-UV guidance and has the potential in attaining polarization-maintaining performance.

© 2018 Optical Society of America

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