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首页> 外文会议>Conference on Diffractive and Holographic Technologies for Integrated Photonic Systems Jan 22-23, 2001, San, Jose, USA >Design of blazed crossed-gratings for beam couplers in large-core optical fibers
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Design of blazed crossed-gratings for beam couplers in large-core optical fibers

机译：大芯光纤中光束耦合器的闪耀交叉光栅设计

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摘要

We developed a novel design technique for multi-fanout diffractive optical elements (DOEs) with high diffraction efficiencies. This technique makes it possible to control both diffraction directions and beam power ratio of output beams. It easily provides phase distributions of DOEs without iterative calculation procedures. The design concept includes superimposing blazed gratings resulting in a crossed-grating. This design technique provides DOEs with high diffraction efficiency of more than 81 percent by computer simulations based on the Fraunhofer diffraction theory. The diffraction efficiency has its minimum value when a DOE has even output-beam power ratio. We fabricated two fanouts DOEs with 1:16 output-beam power ratio designed by this technique. The measured diffraction efficiency is well agreed with simulation results of 88 percent. The DOEs designed by this technique may be suitable for large-core beam-couplers with unequal output-beam power-ratio.
机译：我们开发了一种具有高衍射效率的多扇出衍射光学元件（DOE）的新颖设计技术。该技术使得可以控制输出光束的衍射方向和光束功率比。它无需迭代计算程序即可轻松提供DOE的相位分布。设计概念包括叠加闪耀光栅，从而产生交叉光栅。通过基于Fraunhofer衍射理论的计算机模拟，该设计技术可为DOE提供超过81％的高衍射效率。当DOE具有均匀的输出光束功率比时，衍射效率具有最小值。我们用这种技术设计了两个扇形DOE，它们的输出光束功率比为1:16。测得的衍射效率与88％的模拟结果完全吻合。通过这种技术设计的DOE可能适用于输出光束功率比不相等的大芯光束耦合器。

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