Optical reconstruction of digital holograms recorded at 10.6 μm: route for 3D imaging at long infrared wavelengths

摘要

We demonstrate the optical reconstruction in the visible range (0:532 μm) of digital holograms recorded at long IRnwavelengths (10:6 μm) by means of a spatial light modulator. By using an integrated recording-reconstruction system,nit is, in fact, feasible to achieve direct imaging of holograms acquired outside the visible range, i.e., in the IRnspectrum. By choosing a Fourier recording configuration, the reconstructed image, obtained at about a 20 timesnshorter wavelength than the acquisition image, exhibits minor aberrations, which do not significantly affect thenoptical reconstruction. The high NA achievable at a long IR wavelength allows us to image large objects at reasonablendistances.