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High-contrast filtering by multipass diffraction between paired volume Bragg gratings

机译:配对体积布拉格光栅之间通过多程衍射进行的高对比度滤波

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High-contrast filtering via multiple reflections between matched volume Bragg gratings (VBGs) is demonstrated. The use of multiple reflections serves to increase the suppression ratio of the out-of-band spectral content such that contributions of grating sidelobes can be mitigated. The result is a device that retains spectral and angular selectivity and diffracts light into a single order with high efficiency but reshapes the spectral/angular response to achieve higher signal-to-noise ratios. We demonstrate that multipass spectral filters can be recorded with extremely high suppression ratios using reflecting Bragg gratings (RBGs) in three different configurations. These filters demonstrate roll-offs of over 150 dBm. Similarly, we demonstrate angular filtering by multipass transmitting gratings. (C) 2015 Optical Society of America
机译:演示了通过匹配体积的布拉格光栅(VBG)之间的多次反射进行的高对比度滤波。多次反射的使用用于增加带外频谱含量的抑制率,从而可以减轻光栅旁瓣的影响。结果是一种装置,该装置可以保留光谱和角度选择性,并以高效率将光衍射到一个单次,但可以重新调整光谱/角度响应,以实现更高的信噪比。我们证明了使用三种不同配置的反射式布拉格光栅(RBG),可以以极高的抑制比记录多通频谱滤波器。这些滤波器显示出超过150 dB / nm的滚降。类似地,我们演示了通过多通透射光栅进行的角度滤波。 (C)2015年美国眼镜学会

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