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首页> 外文会议>Photonic Fiber and Crystal Devices: Advnaces in Materals and Innovations in Device Applications; Proceedings of SPIE-The International Society for Optical Engineering; vol.6698 >Holographic fixing with modulated light in two-center holographic recording
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Holographic fixing with modulated light in two-center holographic recording

机译：两中心全息记录中的调制光全息固定

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摘要

The two-center holographic recording method is a very effective technique to realize nonvolatile photorefractive holographic storage in doubly-doped LiNbO3 crystals, but its main drawbacks are low fixing diffraction efficiency and low recording sensitivity. Commonly homogeneous readout light was used to fixing holographic grating, because the concentration of donor in shallower center had a nearly 180° phase difference to space-charge field at the end of recording phase, a negative photovoltaic field should be created and drive part of electrons come back to its origin position, finally low the fixing space-charge field. In this paper a new fixing method for two-center holographic recording was proposed, and the modulated light with the same optical phase to recording light is used to fix holographic. The new formed photovoltaic field has the same phase with recording light and counteracts with the negative photovoltaic field, finally heavily enhance the fixed space-charge field. Furthermore, the recording sensitivity can be markedly increased with higher intensity ratio of recording light to sensitizing light, at the cost of a little decrease in fixed space-charge field.
机译：两中心全息记录方法是在双掺杂LiNbO3晶体中实现非易失性光折变全息存储的非常有效的技术，但其主要缺点是固定衍射效率低和记录灵敏度低。通常使用均匀的读出光来固定全息光栅，因为在记录阶段结束时，较浅中心的施主浓度与空间电荷场具有接近180°的相位差，因此应产生负光伏场并驱动部分电子回到其原点位置，最后使固定空间电荷场降低。本文提出了一种新的双中心全息记录定影方法，并采用与记录光具有相同光相位的调制光进行全息定影。新形成的光伏场与记录光具有相同的相位，并与负光伏场抵消，最终大大增强了固定的空间电荷场。此外，可以以较高的记录光与敏化光的强度比来显着地提高记录灵敏度，其代价是固定空间电荷场的减小一些。

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