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Mid-infrared supercontinuum generation using As_2Se_3 photonic crystal fiber and the impact of higher-order dispersion parameters on its supercontinuum bandwidth

机译：As_2Se_3光子晶体光纤产生中红外超连续谱及其高阶色散参数对其超连续谱带宽的影响

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摘要

A dispersion engineered As2Se3 chalcogenide hexagonal photonic crystal fiber which can produce a mid-infrared supercontinuum (SC) spectral evolution spanning from 2 mu m to beyond 15 mu m with a low peak power of 3 kW is numerically designed and demonstrated. Numerical analysis is carried out to investigate the impact of higher-order dispersion (HOD) parameters on the output SC bandwidth and shows that the SC spectral broadening at the output of the proposed design depends on the convergence of the Taylor approximation with increasing fitting parameters, which implies a sufficient number of HOD parameters must be included during numerical simulations. Four designs with different structural parameters are optimized for pumping, each operating at a different pump wavelength to test the convergence of output SC by the successive addition of HOD parameters. To realize spurious free SC spectral evolution by the proposed designs, HOD terms up to the sixteenth-order are included during all SC simulations. The proposed design can be used in molecular finger print spectroscopy, biomedical imaging as well as various mid-infrared region applications.
机译：数值设计并演示了一种分散工程化的As2Se3硫族化物六角形光子晶体光纤，该光纤可以产生从2μm到超过15μm的中红外超连续谱（SC）光谱，并具有3 kW的低峰值功率。进行了数值分析，以研究高阶色散（HOD）参数对输出SC带宽的影响，并表明，所提出设计的输出处的SC光谱展宽取决于泰勒近似随着收敛参数的收敛而收敛，这意味着在数值模拟过程中必须包括足够数量的HOD参数。针对泵浦优化了具有不同结构参数的四种设计，每种设计在不同的泵浦波长下运行，以通过连续添加HOD参数来测试输出SC的收敛。为了通过所提出的设计实现无杂散的SC频谱演化，在所有SC模拟过程中都包括高达16阶的HOD项。所提出的设计可用于分子指纹图谱，生物医学成像以及各种中红外区域应用。

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