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High-frame-rate joint Fourier-transform correlator based on Sn_(2)P_(2)S_(6) crystal

机译:基于Sn_(2)P_(2)S_(6)晶体的高帧率联合傅立叶变换相关器

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摘要

We present a joint Fourier-transform correlator working at a 10-kHz repetition rate. It is based on a photorefractive Sn_(2)P_(2)S_(6) crystal operated in the pulsed direct band-to-band photoexcitation regime at a wavelength of 532 nm and a pulse length of 50 ns. The intersection of two plane waves with a total pulse fluence of 100 μJ/cm~(2) results in a buildup of thin dynamic holograms to a typical diffraction efficiency of 10~(-4) in a time of ~1 μs and decay again in less than 10 μs. The correlator was tested by a fast image sequence generated by the pulsed readout of a holographic memory system. Successful correlation at a rate of 10 kHz has already been achieved for a pulse energy of only 200 nJ in the template images.
机译:我们提出了一个以10kHz重复频率工作的联合傅立叶变换相关器。它基于光折射Sn_(2)P_(2)S_(6)晶体,该晶体在532nm的波长和50ns的脉冲长度下以脉冲直接带间光激发方式工作。两个平面波的总脉冲通量为100μJ/ cm〜(2)的相交导致在约1μs的时间内将薄的动态全息图累积到典型的衍射效率10〜(-4)并再次衰减在不到10μs的时间内通过全息存储系统的脉冲读数生成的快速图像序列测试相关器。对于模板图像中仅200 nJ的脉冲能量,已经实现了10 kHz速率的成功相关。

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