`Viewing' objects hidden in highly scattering media by cross-correlating the Fourier transform of the image with the incident field in a second-order non-linear crystal

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• 作者：Andreoni ; Alessandra ; Bondani ; Maria ; Potenza ; Marco A.C. ; Villani ; Fulvia
• 关键词：Frequency conversion ; Optical cross-correlation ; Optical imaging/mapping ; Electromagnetic scattering by random media ; 42.65.&minus ; k ; 42.65.Ky ; 42.30.&minus ; d
• 刊名：Optics Communications
• 出版年：2000
• 出版时间：February 1, 2000
• 年：2000
• 卷：174
• 期：5-6
• 页码：487-497
• 全文大小：924 K

文摘

The detectability of the image of an object immersed in a scattering medium and transilluminated by a multi-mode laser pulse can be enhanced by cross-correlating the transmitted field with a fraction of the incident one in a β-barium borate crystal. We show that this effect arises from the interplay of the temporal coherence properties of the interacting fields, even in the presence of a modest coherence such as that of a Q-switched Nd:YAG laser pulse.