A negative-curvature hollow-core fiber structure with double trigonal-symmetrical anti-resonant elements

Yanyan Zhou; Yingbin Xing; Nengli Dai; Jinyan Li

doi:10.1117/12.2626932

27 March 2022 A negative-curvature hollow-core fiber structure with double trigonal-symmetrical anti-resonant elements

Yanyan Zhou, Yingbin Xing, Nengli Dai, Jinyan Li

Proceedings Volume 12169, Eighth Symposium on Novel Photoelectronic Detection Technology and Applications; 12169BH (2022) https://doi.org/10.1117/12.2626932
Event: Eighth Symposium on Novel Photoelectronic Detection Technology and Applications, 2021, Kunming, China

Abstract

High power ytterbium doped fiber laser has become the most popular laser source in metal cutting, metal welding and other material processing fields[1]. Single mode fiber lasers with excellent beam quality are expected to achieve high aspect ratio and ultrafast processing speed[2]. While the drawbacks of traditional optical transmission fibers such as nonlinear optical effects and the low material’s laser induced damage threshold have hindered the further growing of the high output power[3]. Hollow-core fibers (HCFs) would replace traditional fiber to be an ideal medium for ultra-high-power laser transmission with the advantages of lower nonlinearity, and high damage threshold[4,5]. The simplified negative-curvature hollow-core fibers (NC-HCFs) with simpler structure, lower loss, as wall as great advantages in bandwidth have attracted much attentions in recent year[6–9]. In this work, we propose a novel negative-curvature hollow-core fiber structure with double trigonal-symmetrical anti-resonant elements implementing single-mode or polarization-maintaining transmission for high-power laser delivery at 1μm wavelength window. The single-mode performance with a higher-order modes extinction ratio (HOMER) as high as 4.65*10⁴ is achieved, and it remains >1*10⁴ within a large range of tubes sizes, which can increase the flexibility of fiber fabrication. Fig. 1 shows the cross-section of the proposed NC-HCF. The cladding is constituted of 3 small tubes with diameter of d₁, and 9 large tubes with diameter of d₂. The 3 small tubes and 3 large tubes are arranged in a staggered pattern in the inner layer to form double trigonal-symmetrical anti-resonant elements, while the other 6 large tubes are connected to the jacket tube in the outer layer.

Citation Download Citation

Yanyan Zhou, Yingbin Xing, Nengli Dai, and Jinyan Li "A negative-curvature hollow-core fiber structure with double trigonal-symmetrical anti-resonant elements", Proc. SPIE 12169, Eighth Symposium on Novel Photoelectronic Detection Technology and Applications, 12169BH (27 March 2022); https://doi.org/10.1117/12.2626932

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KEYWORDS

Structured optical fibers

Fermium

Frequency modulation

Fiber lasers

Tolerancing

Metals

Solids

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