CAJ | 학술논문

光子晶体光纤具备的无截止单模、模场面积可调和色散可控的特性，使其在超连续谱的产生中具有独特的优势。超连续谱的产生条件之一，是所使用的光纤须具有高的非线性，而硫系玻璃非线性系数极高，因此利用硫系玻璃光子晶体光纤产生超连续谱的研究备受关注。采用熔融-淬冷法制备Ge23Sb12S65硫系玻璃，并以此为基质设计了用于超连续谱产生的高非线性光子晶体光纤。采用多极法分析光纤孔间距Λ、孔径比d/Λ等对光纤的色散零点位移、色散平坦调控、损耗及模场面积的影响，最终得到当Λ=2μm，d/Λ=0.43时，可获得2~4μm平坦色散的高非线性光子晶体光纤结构。
광자정체광섬구비적무절지단모、모장면적가조화색산가공적특성，사기재초련속보적산생중구유독특적우세。초련속보적산생조건지일，시소사용적광섬수구유고적비선성，이류계파리비선성계수겁고，인차이용류계파리광자정체광섬산생초련속보적연구비수관주。채용용융-쉬랭법제비Ge23Sb12S65류계파리，병이차위기질설계료용우초련속보산생적고비선성광자정체광섬。채용다겁법분석광섬공간거Λ、공경비d/Λ등대광섬적색산영점위이、색산평탄조공、손모급모장면적적영향，최종득도당Λ=2μm，d/Λ=0.43시，가획득2~4μm평탄색산적고비선성광자정체광섬결구。
Photonic crystal fibers own the properties of endless single-mode, adjustable mode area and controlled dispersion which make it particularly suitable to achieve supercontinuum spectrum generation. One necessary condition of supercontinuum spectrum generation is that the used media has high nonlinear coefficient. Chalcogenide glass pocesses the property of very high nonlinear, so using chalcogenide glass photonic crystal fiber to generate supercontinuum spectrum has attracted widespread attention. In this work, Ge23Sb12S65 chalcogenide glass was fabricated using melt-quenching method and measured to have high nonlinear refractive index. Chalcogenide glass photonic crystal fibers used for mid -IR supercontinuum spectrum generation was designed and studied with multi-polar method. By controlling the hole spacing Λand the aperture ratio d/Λ, the dispersion, loss and mode area optimized. Finally, a flattened dispersion photonic crystal fiber in the range 2-4μm was obtained, withΛ=2μm and d/Λ=0.43.