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Properties of harmonic gratings in Mn:KNSBN in the process of electrical domain fixing

机译：电域固定过程中Mn：KNSBN中谐波光栅的特性

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Abstract: Photorefractive crystals have many applications in holographic storage, optical communications, and nonlinear optical information processing. One problem is that the photorefractive holographic index gratings can be erased in the readout process. Several non-destructive approaches have been proposed and demonstrated in different photorefractive materials. Based on the initial research of domain fixing on KNSBN crystals, we studied the high order harmonic gratings during electrical domain fixing process in KNSBN crystals. In this paper, we mainly focus on the properties of the first order and second order harmonic index gratings of Mn-doped KNSBN crystal during electrical domain fixing process at room temperature. Domain fixing in Rh:SBN was also investigated, and the results in Mn:KNSBN and Rh:SBN were compared. In Mn:KNSBN crystals, the second order harmonic grating becomes stronger after fixing. This may be the main reason of the high noise in the revealed grating, which affects the image quality and fidelity. In addition, the effect of the accumulated charges in the revealing process was also discussed. !14
机译：摘要：光折变晶体在全息存储，光通信和非线性光信息处理中有许多应用。一个问题是光折射全息光栅在读出过程中会被擦除。已经提出了几种非破坏性方法，并在不同的光折射材料中得到了证明。基于对KNSBN晶体进行畴固定的初步研究，我们研究了KNSBN晶体在电畴固定过程中的高次谐波光栅。在本文中，我们主要关注室温下电畴固定过程中掺锰的KNSBN晶体的一阶和二阶谐波指数光栅的特性。还研究了Rh：SBN中的域固定，并比较了Mn：KNSBN和Rh：SBN中的结果。在Mn：KNSBN晶体中，固定后二阶谐波光栅变得更强。这可能是显露光栅中高噪声的主要原因，这会影响图像质量和保真度。此外，还讨论了累积电荷在揭示过程中的作用。 ！14

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