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21 February 2011 Nonlinear holographic imaging of terahertz radiation
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We present a theoretical investigation of a non-collinear sum frequency generation in an electro-optic crystal between visible and THz radiation. This coherent mixing results in the encoding of the spatial phase of the THz object field onto the visible wave. The "crystal + optical pump" system behaves as a lens for the THz field. The THz field is converted into the visible range, but with a phase-preserving transformation analogous to holography. This scheme provides an imaging capability, and we can thus record THz scenes with conventional optical detectors that are much more sensitive than THz sensors. We show that a Nonlinear Snell-Descartes' Lens Formula can be derived from our analysis; in comparison to the classical one, this generalized lens formula exhibits an additional magnification factor proportional to the ratio between the optical and THz wavelength.
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J. C. Delagnes, P. Mounaix, and L. Canioni "Nonlinear holographic imaging of terahertz radiation", Proc. SPIE 7917, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications X, 79170D (21 February 2011);

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