arXiv 1003.00422010-03physics.optics

光子带隙光纤束光谱仪

Photonic bandgap fiber bundle spectrometer

Qu Hang, Bora Ung, Imran Syed, Ning Guo, Maksim Skorobogatiy

备注：: 15 pages; 8 figures
DOI：: 10.1364/AO.49.004791

摘要：

我们实验演示了一个由光子带隙光纤束和黑白CCD相机组成的全光纤光谱仪。本工作中使用的光子晶体光纤是设计用于可见光谱范围的大实芯全塑料布拉格光纤，具有60 nm-180 nm宽的带隙。选择100个布拉格光纤以具有覆盖400 nm-840 nm光谱范围的互补且部分重叠的带隙。在我们的工作中使用的光纤束在其功能上等同于一组100个光学滤波器，这些光学滤波器密集地堆积在~ 1cm 2的面积中。黑白CCD摄像机，然后用于捕获光谱“分箱”的图像的输入光在输出面的光纤束。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透射矩阵的伪逆的算法。然后，我们研究了该光谱系统的分辨率限制，通过测试其性能，使用光谱窄测试峰（FWHM 5 nm-25 nm）集中在450 nm-700 nm光谱间隔内的不同位置。我们发现，无论峰宽或峰位如何，峰中心波长总是可以在其真实值的百分之几内重建。我们相信，光子带隙光纤光栅光谱仪有潜力成为一个重要的技术，在多光谱成像，因为它们的简单性（缺乏移动部件），瞬时响应，和高度集成。

英文摘要：

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.

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摘要：

英文摘要：

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