Abstract
We present a new concept for an imaging X-ray sensor based on X-ray-induced hologram erasure. A transmission hologram is recorded by two plane waves in a photorefractive lithium niobate crystal. This hologram acts as a sensor plate that is positioned towards the X-ray radiation like a conventional X-ray film. Spatially modulated X-ray illumination produces a spatially modulated conductivity that erases the hologram. By these means, a hologram with spatially modulated diffraction efficiency is obtained. Reading of the hologram with a plane wave of visible light then yields in the diffracted beam a replica of the original X-ray light pattern. First experimental data are presented. High spatial resolution, limited in principle just by the wavelength of the probe light, together with a time integrating behavior are the main advantages of such a detector.
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Dirk Berben, Birk Andreas, Karsten Buse, "New photorefractive imaging x-ray sensor", Proc. SPIE 4459, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications VII, and Optical Data Storage, (23 January 2002); doi: 10.1117/12.454012; https://doi.org/10.1117/12.454012
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