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Opt Express. 2009 Nov 9;17(23):20885-90. doi: 10.1364/OE.17.020885.

Enhanced 2D-image upconversion using solid-state lasers.

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  • 1DTU Fotonik, Technical University of Denmark, DK-4000 Roskilde, Denmark.


Based on enhanced upconversion, we demonstrate a highly efficient method for converting a full image from one part of the electromagnetic spectrum into a new desired wavelength region. By illuminating a metal transmission mask with a 765 nm Gaussian beam to create an image and subsequently focusing the image inside a nonlinear PPKTP crystal located in the high intra-cavity field of a 1342 nm solid-state Nd:YVO(4) laser, an upconverted image at 488 nm is generated. We have experimentally achieved an upconversion efficiency of 40% under CW conditions. The proposed technique can be further adapted for high efficiency mid-infrared image upconversion where direct and fast detection is difficult or impossible to perform with existing detector technologies.

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