7 October 2005 The analysis and the enhancement of low diffraction efficiency in 90-degree holographic recording geometry
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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.
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Yu Zhou, Liren Liu, Zhu Luan, Aimin Yan, 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); doi: 10.1117/12.612927; https://doi.org/10.1117/12.612927
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KEYWORDS
Diffraction

Diffraction gratings

Holography

Crystals

Modulation

Iron

Refractive index

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