The analysis and the enhancement of low diffraction efficiency in 90-degree holographic recording geometry

Yu Zhou; Liren Liu; Zhu Luan; Aimin Yan; Lijuan Wang

doi:10.1117/12.612927

7 October 2005 The analysis and the enhancement of low diffraction efficiency in 90-degree holographic recording geometry

Yu Zhou, Liren Liu, Zhu Luan, Aimin Yan, Lijuan Wang

Author Affiliations +

Proceedings Volume 5911, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications XI; 591115 (2005) https://doi.org/10.1117/12.612927
Event: Optics and Photonics 2005, 2005, San Diego, California, United States

Abstract

The 90-degree recording geometry in photorefractive often suffers low diffraction efficiency and small sensitivity. For the low diffraction efficiency, previous researches considered it mainly come from larger K-vector. But in experiments the diffraction efficiency in 90-degree geometry is so low that the large K-vector can't explain the origin of low diffraction efficiency. We think the main reason of low diffraction efficiency in 90-degree geometry comes from the coupling between the incident light and diffraction light. The volume grating formatted in 90-degree geometry must be volume grating with finite size and follow the diffraction characteristic of crossed-beam volume gratings. When the refractive index change Δn>1×10^-4, the diffractive efficiency in 90-degree recording geometry would be comparable with that in transmission geometry. However narrow grating space in 90-degree recording geometry makes it is more sensitive to ambient disturbs and leads to low effective modulation depth. That is why we can't obtain high diffraction efficiency for 90-degree geometry in experiments. For obtaining high diffraction efficiency in 90-degree geometry experimentally an active stabilization system is necessary.

Citation Download Citation

Yu Zhou, Liren Liu, Zhu Luan, Aimin Yan, and Lijuan Wang "The analysis and the enhancement of low diffraction efficiency in 90-degree holographic recording geometry", Proc. SPIE 5911, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications XI, 591115 (7 October 2005); https://doi.org/10.1117/12.612927

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