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首页> 外文会议>Novel Optical Systems Design and Optimization X; Proceedings of SPIE-The International Society for Optical Engineering; vol.6668 >Volume holographic beam splitter for hyperspectral imaging applications
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Volume holographic beam splitter for hyperspectral imaging applications

机译：体全息分束器，用于高光谱成像应用

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RL Associates Inc. has designed a novel 12-ehannel, multi-spectral beam splitter which covers the visible region of the spectrum. Commonly-used beam splitting techniques include dichroic mirrors, spectral bandpass filters, ruled diffraction gratings, and prisms, all of which are large and difficult to handle. The RL Associates' beam splitter, developed for the US Navy's multi-spectral imaging programs, uses multiplexed volume holographic gratings. A volume holographic optical splitter offers multi-channel splitting in a single element which can be customized to accommodate a broad range of sensor array geometries. The RL Associates beam splitter has an efficiency of 75% or greater, and an angular acceptance of up to 25 degrees. These gratings are written in a thermally stable photosensitive glass. Currently, a 12-channel beam splitter has been developed by multiplexing three volume holograms in a 2x2 array with each element being offset by approximately 35 nm. The output of each element is then directed toward a separate imaging detector. Each detector is placed at a specific, unique position relative to the other detectors. This ensures that no cross talk occurs between beam splitting elements. A prototype beam splitter is currently under development. This beam splitter will extend into the short-wave infrared region while still working in the visible region.
机译：RL Associates Inc.设计了一种新颖的12通道，多光谱分束器，它覆盖了光谱的可见区域。常用的分束技术包括二向色镜，光谱带通滤光片，直纹衍射光栅和棱镜，所有这些技术都很大且难以操作。 RL Associates的分束器是为美国海军的多光谱成像程序开发的，它使用多路复用体全息光栅。体积全息分光器可在单个元件中提供多通道分光，可对其进行定制以适应各种传感器阵列的几何形状。 RL Associates分束器的效率为75％或更高，角度接受度最高为25度。这些光栅写在热稳定的光敏玻璃上。当前，已经通过在2×2阵列中多路复用三个体全息图而开发了一种12通道分束器，其中每个元件偏移大约35nm。然后将每个元件的输出导向单独的成像检测器。每个检测器均相对于其他检测器放置在特定的唯一位置。这确保了在分束元件之间不会发生串扰。目前正在开发原型分束器。该分束器将延伸到短波红外区域，同时仍在可见区域工作。

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