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6 November 2018 Gratings theory for pico-optics applications
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Grating theory is normally designed for nano/microoptics applications. If we consider the further smaller size, we might enter the area of picometer optics. Although it seems picometer optics might be the frontier of developing nanooptics devices into the next step, it is hard to make picometer optical devices previously. We will report a series of three works that can lead us into the picometer scale. The first is to fabricate high-density gratings whose periods can be controlled to be slightly different in picometer range, which is done by rotating Dammann grating in a microrad angle for achieving the grating period continuously tuned in picometer scale. The second is to propose carrier pico-grating array for measuring the distances of the moving grating, which can be done in picometer accuracy. The third is to measure the wavefront of two-beam interferences in picometer accuracy, which is far beyond the current normal laser interferometer. Initial experimental results demonstrated that the wavefront has been measured with 250pm linear phase difference, which is impossible to obtain with the traditional laser interferometer. Taking consideration of these picometer works together, we believe that picometer optics should come with these picometer optical tools further extended in the near future.
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Changhe Zhou, Minkang Li, Xiansong Xiang, Chunlong Wei, Wei Jia, and Changcheng Xiang "Gratings theory for pico-optics applications", Proc. SPIE 10818, Holography, Diffractive Optics, and Applications VIII, 108180G (6 November 2018);


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