Chalcogenide Ge20Sb5Se75 photonic crystal fiber with seven air-hole rings for ultraflat mid-infrared supercontinuum generation

IF 1.2 4区物理与天体物理 Q4 OPTICS

Laser Physics Pub Date : 2024-08-22 DOI:10.1088/1555-6611/ad6d4b

Lanh Chu Van, Bao Tran Le Tran

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引用次数: 0

Abstract

Supercontinuum (SC) generation in solid-core circular photonic crystal fibers (PCFs) made of Ge₂₀Sb₅Se₇₅ is numerically analyzed. A large core is projected to increase light coupling efficiency into selected PCFs as well as raise coupling to standard silica fibers. High nonlinear coefficient and near-zero flat dispersion allow ultraflat SC spanning 1.5–4.6 μm in an all-normal dispersion regime. This requires 3 kW of peak power with 180 fs of pulse duration. The fiber with one zero-dispersion wavelength (ZDW) generates SC bandwidth in the range of 1.54–7.39 μm at 3.5 μm using peak power of 10 kW. For the same input power, the SC spectral covers from 1.39 to 7.36 μm in 10 cm of fiber with two ZDWs. These are wider SC bandwidths than those of previous chalcogenide fibers reached with lower peak powers. Therefore, the proposed Ge₂₀Sb₅Se₇₅ PCFs are excellent candidates for the broadband ultraflat mid-infrared SC spectra used in high-speed nonlinear imaging and frequency measurement.

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具有七个气孔环的卤化物 Ge20Sb5Se75 光子晶体光纤，用于超平中红外超连续发光

对 Ge20Sb5Se75 制成的实芯圆形光子晶体光纤（PCF）中的超连续（SC）产生进行了数值分析。预计大芯可提高光与所选 PCF 的耦合效率，并提高与标准硅光纤的耦合。高非线性系数和接近零的扁平色散使得超扁平 SC 可以在全正常色散状态下跨越 1.5-4.6 μm。这需要 3 kW 的峰值功率和 180 fs 的脉冲持续时间。具有一个零色散波长（ZDW）的光纤使用 10 kW 的峰值功率在 3.5 μm 处产生 1.54-7.39 μm 范围内的 SC 带宽。在输入功率相同的情况下，使用两个 ZDW 的 10 厘米光纤的 SC 频谱覆盖范围为 1.39 至 7.36 μm。这比以前的掺瑀光纤在峰值功率较低的情况下达到的更宽的 SC 带宽。因此，所提出的 Ge20Sb5Se75 PCF 是用于高速非线性成像和频率测量的宽带超平中红外 SC 光谱的极佳候选材料。

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来源期刊

Laser Physics 物理-光学

CiteScore

2.60

自引率

8.30%

发文量

127

审稿时长

2.2 months

期刊介绍： Laser Physics offers a comprehensive view of theoretical and experimental laser research and applications. Articles cover every aspect of modern laser physics and quantum electronics, emphasizing physical effects in various media (solid, gaseous, liquid) leading to the generation of laser radiation; peculiarities of propagation of laser radiation; problems involving impact of laser radiation on various substances and the emerging physical effects, including coherent ones; the applied use of lasers and laser spectroscopy; the processing and storage of information; and more. The full list of subject areas covered is as follows: -physics of lasers- fibre optics and fibre lasers- quantum optics and quantum information science- ultrafast optics and strong-field physics- nonlinear optics- physics of cold trapped atoms- laser methods in chemistry, biology, medicine and ecology- laser spectroscopy- novel laser materials and lasers- optics of nanomaterials- interaction of laser radiation with matter- laser interaction with solids- photonics