Ultrahigh Transverse Mode Purity by Enhanced Modal Filtering in Double-Clad Single-Ring Hollow-Core Photonic Crystal Fiber,Laser & Photonics Reviews

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Ultrahigh Transverse Mode Purity by Enhanced Modal Filtering in Double-Clad Single-Ring Hollow-Core Photonic Crystal Fiber
Laser & Photonics Reviews ( IF 9.8 ) Pub Date : 2024-02-11 , DOI: 10.1002/lpor.202301111
Zhuozhao Luo _{1,

2,

3} , Jiapeng Huang _{2,

4} , Yu Zheng ₅ , Ruochen Yin _{4,

5} , Long Zhang ₂ , Xin Jiang _{2,

4} , Meng Pang _{2,

3,

4}

Affiliation

Maintaining high fundamental mode purity in low-loss single-ring hollow-core photonic crystal fiber remains a key challenge. Here a double-clad anti-resonant-reflecting design is reported that, through modal filtering, provides high suppression of higher-order modes while maintaining a low-loss fundamental mode. The structure consists of a ring of six thin-walled capillaries fused to the inner wall of a thicker-walled capillary that is in turn fused at a single point to the silica outer cladding. Greater than 40 dB m⁻¹ suppression of higher order modes over a 6 nm wide window whose central wavelength can be tuned by adjusting the gas pressure is observed. The novel design paves the way to practical applications of such fibers in high-quality laser beam delivery and low-noise optical-signal transmission.

中文翻译：

双包层单环空芯光子晶体光纤中增强模态滤波的超高横模纯度

在低损耗单环空心光子晶体光纤中保持高基模纯度仍然是一个关键挑战。这里报道了一种双包层抗谐振反射设计，通过模态滤波，提供对高阶模式的高度抑制，同时保持低损耗基模。该结构由六个薄壁毛细管环组成，这些薄壁毛细管熔合到厚壁毛细管的内壁，而厚壁毛细管又在单点熔合到二氧化硅外包层。观察到在 6 nm 宽窗口上对高阶模的抑制大于 40 dB m ⁻¹ ，该窗口的中心波长可以通过调节气压来调谐。这种新颖的设计为此类光纤在高质量激光束传输和低噪声光信号传输中的实际应用铺平了道路。

更新日期：2024-02-11

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