Numerical Investigation of Over One Octave High-Coherence Supercontinuum Generation in Mid-Infrared Based on As2Se3 Tapered Photonic Crystal Fiber

IF 1 4区工程技术 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC

Microwave and Optical Technology Letters Pub Date : 2024-12-11 DOI:10.1002/mop.70056

Jin Wen, Huimin Yu, Qian Wang, Zhengwei Wu, Hui Zhang, Ying Zhang, Yu Pan

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Abstract

The generation of high-coherence mid-infrared (MIR) supercontinuum (SC) spanning over one octave in As₂Se₃ tapered photonic crystal fiber (As₂Se₃-TPCF) is investigated through numerical simulations. Combined with the photonic crystal fiber and tapered fiber's structural characteristics, six As₂Se₃-TPCFs with different tapered structures are designed. The tapered regions are the power function and cosine tapered structures, respectively, while the taper waist and the untapered region have the same structure. Moreover, the nonlinear coefficient of the taper waist is 2.23825 W⁻¹m⁻¹ calculated by the finite element method (FEM), and the zero-dispersion wavelength (ZDW) in the down-taper moves with the increase of transmission distance, shifted from 5.2 to 2.4 μm. The temporal and spectral features of the MIR SC generated in As₂Se₃-TPCFs are numerically simulated by solving the generalized nonlinear Schrödinger equation (GNLSE), and the spectral broadening of As₂Se₃-TPCFs is mainly caused by self-phase modulation, Raman soliton self-frequency shift, and dispersive wave generation. Finally, six As₂Se₃-TPCFs with lengths of 0.1 m are pumped by short pulses with a center wavelength of 4.0 μm, pulse width of 40 fs, and pulse energy of 250 pJ, the results show that the linear tapered As₂Se₃-TPCF and the cosine tapered As₂Se₃-TPCF can achieve high-coherence MIR spectra spanning 1.6 octaves, with spectral widths from 2.1 to 6.4 μm.

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基于As2Se3锥形光子晶体光纤的中红外一倍频高相干超连续谱产生的数值研究

通过数值模拟研究了在 As2Se3 锥形光子晶体光纤（As2Se3-TPCF）中产生跨度超过一个倍频程的高相干中红外超连续（SC）的情况。结合光子晶体光纤和锥形光纤的结构特点，设计了六种不同锥形结构的 As2Se3-TPCF 。锥形区域分别为幂函数锥形结构和余弦锥形结构，锥腰和未锥形区域结构相同。此外，通过有限元法（FEM）计算，锥腰的非线性系数为 2.23825 W-1m-1，下锥体的零色散波长（ZDW）随着传输距离的增加而移动，从 5.2 μm 变为 2.4 μm。通过求解广义非线性薛定谔方程（GNLSE），对 As2Se3-TPCF 中产生的 MIR SC 的时间和光谱特征进行了数值模拟。最后，用中心波长为 4.0 μm、脉冲宽度为 40 fs、脉冲能量为 250 pJ 的短脉冲对 6 个长度为 0.1 m 的 As2Se3-TPCF 进行泵浦，结果表明线性锥形 As2Se3-TPCF 和余弦锥形 As2Se3-TPCF 可以实现跨越 1.6 个倍频程的高相干 MIR 光谱，光谱宽度为 2.1 到 6.4 μm。

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来源期刊

Microwave and Optical Technology Letters 工程技术-工程：电子与电气

CiteScore

3.40

自引率

20.00%

发文量

371

审稿时长

4.3 months

期刊介绍： Microwave and Optical Technology Letters provides quick publication (3 to 6 month turnaround) of the most recent findings and achievements in high frequency technology, from RF to optical spectrum. The journal publishes original short papers and letters on theoretical, applied, and system results in the following areas. - RF, Microwave, and Millimeter Waves - Antennas and Propagation - Submillimeter-Wave and Infrared Technology - Optical Engineering All papers are subject to peer review before publication