Holographic grating made of two-wavelength water-resistant photopolymer
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摘要: 介绍了一种对488nm蓝光和632.8nm红光均敏感的双色非水溶性光致聚合物制成的二重全息光栅。理论分析得出此光栅的分辨率＞5000line/mm，温度变化时中心波长的漂移几乎为零。实验仪器测得光栅的衍射效率最高达到90%以上，而且该光栅具有成本低和一次成型的优点，适合制作波分复用器。与单波长的二重光栅相比，它解决了由于光的相干性出现的串扰问题，串扰更小，所以在制作光栅时两束光不但可以选择角度入射也可以选择平行入射，同时具有良好的波长选择性和角度选择性。
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关键词:
- 二重光栅 /
- 双波长非水溶性光致聚合物 /
- 衍射效率 /
- 光栅分辨率
Abstract: The double-layer holographic grating made of a new kind of water-resisting photopolymer which is sensitive to the blue light of 488nm and red light of 632.8nm is introduced. Based on the experimental data and theoretical analysis, the characteristics of the material are investigated. The analysis shows that the resolution of this grating is above 5000line/mm and its diffraction efficiency is above 90%. The central wavelength drifting of the grating is nearly zero when temperature changes. The grating has many merits, such as one-step forming, low loss, etc. The doublelayer holographic grating is suitable for fabricating the wavelength-division multiplexer. The crosstalk question caused by the light coherence has been solved by the technology, and the crosstalk is smaller in comparison with the single-wavelength double-layer grating. During the production of the grating, two incident modes of beam can be chosen arbitrarily, which is oblique incidence and parallel incidence. It has the characteristics of wavelength selection and angle selection. -
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