title: Mid-infrared digital holography and holographic interferometry with a tunable quantum cascade laser.
abstract: Mid-infrared digital holography based on CO2 lasers has proven to be a powerful coherent imaging technique due to reduced sensitivity to mechanical vibrations, increased field of view, high optical power, and possible vision through scattering media, e.g., smoke. Here we demonstrate a similar and more compact holographic system based on an external cavity quantum cascade laser emitting at 8 μm. Such a setup, which includes a highly sensitive microbolometric camera, allows the acquisition of speckle holograms of scattering objects, which can be processed in real time. In addition, by exploiting the broad laser tunability, we can acquire holograms at different wavelengths, from which we extract phase images not subjected to phase wrapping, at synthetic wavelengths ranging from hundreds of micrometers to several millimeters.
authors.forename: M
authors.initials: M
authors.lastname: Ravaro
authors.forename: M
authors.initials: M
authors.lastname: Locatelli
authors.forename: E
authors.initials: E
authors.lastname: Pugliese
authors.forename: I
authors.initials: I
authors.lastname: Di Leo
authors.forename: M
authors.initials: M
authors.lastname: Siciliani de Cumis
authors.forename: F
authors.initials: F
authors.lastname: D'Amato
authors.forename: P
authors.initials: P
authors.lastname: Poggi
authors.forename: L
authors.initials: L
authors.lastname: Consolino
authors.forename: R
authors.initials: R
authors.lastname: Meucci
authors.forename: P
authors.initials: P
authors.lastname: Ferraro
authors.forename: P
authors.initials: P
authors.lastname: De Natale