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Mid-IR to near-IR image conversion by thermally induced optical switching in vanadium dioxide

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Abstract

We demonstrate the image conversion from mid-IR to near-IR (NIR) exploiting high-contrast optical switching in vanadium oxide thin-film layers. The intensity distribution of a mid-IR beam is converted to NIR wavelengths exploiting the strong reflectivity changes induced by optical pumping in the mid-IR. We show an experimental setup in which the radiation of a Tm-doped fiber laser at 1940μm and a carbon dioxide at 10.6μm has been converted to both 850nm and 1064nm. The resolution was 35μm and was reached by using an inexpensive CCD camera. The sensitivity of the device increases linearly with sample temperature. We measured a threshold of 144mWcm2, with a sample temperature of 62°C.

© 2010 Optical Society of America

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