Mid-IR and terahertz digital holography based on quantum cascade lasers
2015
Infrared (IR) digital holography (DH) based on CO 2 lasers has proven to be a powerful coherent imaging technique due
to the reduced sensitivity to mechanical vibrations, to the increased field of view, to the high optical power and to
possible vision through scattering media, such as smoke. In this contribution we report IR DH based on the combination
of quantum cascade laser (QCL) sources and a high resolution microbolometric camera. QCLs combine highly desirable
features for coherent imaging, such as compactness, high optical power, and spectral purity. The present availability of
external cavity mounted QCLs having a broad tuning range, makes them suitable sources for multiple wavelength
holographic interferometry. In addition, QCL emission covers several windows throughout a large portion of the IR
spectrum, from the mid-IR to the terahertz region. This allows taking advantage of the different optical response of the
imaged objects at different frequencies, which is crucial for applications such as non-destructive testing and biomedical
imaging. Our holographic system is suitable for the acquisition of both transmission holograms of transparent objects
and speckle holograms of scattering objects, which can be processed in real time to retrieve both amplitude and phase.
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