Polycrystalline zinc selenide optical fibers and fiber lasers are expected to provide powerful capabilities for infrared waveguiding and laser technology. High pressure chemical vapor deposition, which is the only technique currently capable of producing zinc selenide optical fibers, leaves a geometric imperfection in the form of a central pore which is detrimental to mode quality. Chemical vapor transport with large temperature and pressure gradients not only fills this central pore but also encourages polycrystalline grain growth. Increased grain size and a reduction in defects such as twinning are demonstrated with transmission electron microscopy, Raman spectroscopy, and X-ray diffraction, supporting that high-quality material is produced from this method. Finally, the mode structure of the waveguide is improved allowing most of the guided optical intensity to be centrally positioned in the fiber core. Loss as low as 0.22 dB/cm at 1908nm is demonstrated as a result of the material improvement.

中文翻译：

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使用微化学蒸汽传输技术对 ZnSe 光纤进行后处理

多晶硒化锌光纤和光纤激光器有望为红外波导和激光技术提供强大的能力。高压化学气相沉积是目前唯一能够生产硒化锌光纤的技术，它会留下中心孔形式的几何缺陷，这对模式质量不利。具有大温度和压力梯度的化学蒸汽传输不仅填充了这个中心孔，而且还促进了多晶晶粒的生长。透射电子显微镜、拉曼光谱和 X 射线衍射证明了晶粒尺寸的增加和孪晶等缺陷的减少，支持通过这种方法生产出高质量的材料。最后，波导的模式结构得到改进，允许大部分引导光强位于纤芯的中心。由于材料改进，在 1908nm 处的损耗低至 0.22 dB/cm。