标题： 光子带隙光纤束光谱仪 显示英文标题

标题： Photonic bandgap fiber bundle spectrometer

摘要： 我们实验演示了一种全光纤光谱仪，由光子带隙光纤束和黑白CCD相机组成。 本工作中使用的光子晶体光纤是专为可见光波段设计的大型实心芯全塑料布拉格光纤，具有60nm-180nm宽的带隙。 选择了100根布拉格光纤，使其带隙互补且部分重叠，覆盖400nm-840nm的光谱范围。 我们工作中使用的光纤束在功能上等同于一组密集排列在约1cm2面积内的100个光学滤波器。 然后使用黑白CCD相机捕获光纤束输出端面上入射光的光谱“分组”图像。 为了从单个CCD图像重建测试光谱，我们开发了一种基于光谱仪传输矩阵伪逆的算法。 然后通过使用光谱窄测试峰（FWHM 5nm-25nm）在450nm-700nm光谱区间内不同位置进行测试，研究了这种光谱系统的分辨率极限。 我们发现，无论峰宽或位置如何，峰中心波长都可以始终在真实值的几个百分比范围内重建。 我们认为，基于光子带隙光纤束的光谱仪有潜力成为多光谱成像中的重要技术，因为其结构简单（无运动部件）、响应迅速且集成度高。 显示英文摘要

摘要： We experimentally demonstrate an all-fiber spectrometer consisting of a photonic bandgap fiber bundle and a black and white CCD camera. Photonic crystal fibers used in this work are the large solid core all-plastic Bragg fibers designed for operation in the visible spectral range and featuring bandgaps of 60nm - 180nm-wide. 100 Bragg fibers were chosen to have complimentary and partially overlapping bandgaps covering a 400nm-840nm spectral range. The fiber bundle used in our work is equivalent in its function to a set of 100 optical filters densely packed in the area of ~1cm2. Black and white CCD camera is then used to capture spectrally "binned" image of the incoming light at the output facet of a fiber bundle. To reconstruct the test spectrum from a single CCD image we developed an algorithm based on pseudo-inversion of the spectrometer transmission matrix. We then study resolution limit of this spectroscopic system by testing its performance using spectrally narrow test peaks (FWHM 5nm-25nm) centered at various positions within the 450nm-700nm spectral interval. We find that the peak center wavelength can always be reconstructed within several percent of its true value regardless of the peak width or position. We believe that photonic bandgap fiber bundle-based spectrometers have a potential to become an important technology in multispectral imaging because of their simplicity (lack of moving parts), instantaneous response, and high degree of integration.