We demonstrate the optical reconstruction in the visible range ( $0.532\mathrm{\mu m}$ ) of digital holograms recorded at long IR wavelengths ( $10.6\mathrm{\mu m}$ ) by means of a spatial light modulator. By using an integrated recording-reconstruction system, it is, in fact, feasible to achieve direct imaging of holograms acquired outside the visible range, i.e., in the IR spectrum. By choosing a Fourier recording configuration, the reconstructed image, obtained at about a 20 times shorter wavelength than the acquisition image, exhibits minor aberrations, which do not significantly affect the optical reconstruction. The high NA achievable at a long IR wavelength allows us to image large objects at reasonable distances.

© 2010 Optical Society of America

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