title: Optical reconstruction of digital holograms recorded at 10.6 microm: route for 3D imaging at long infrared wavelengths.
abstract: We demonstrate the optical reconstruction in the visible range (0.532 microm) of digital holograms recorded at long IR wavelengths (10.6 microm) 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.
authors.affiliation: Consiglio Nazionale delle Richerche-Istituto Nazionale di Ottica Via Campi Flegrei 34, 80078 Napoli, Italy. melania.paturzo@ino.it
authors.forename: Melania
authors.initials: M
authors.lastname: Paturzo
authors.forename: Anna
authors.initials: A
authors.lastname: Pelagotti
authors.forename: Andrea
authors.initials: A
authors.lastname: Finizio
authors.forename: Lisa
authors.initials: L
authors.lastname: Miccio
authors.forename: Massimiliano
authors.initials: M
authors.lastname: Locatelli
authors.forename: Andrea
authors.initials: A
authors.lastname: Gertrude
authors.forename: Pasquale
authors.initials: P
authors.lastname: Poggi
authors.forename: Riccardo
authors.initials: R
authors.lastname: Meucci
authors.forename: Pietro
authors.initials: P
authors.lastname: Ferraro