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Ghost imaging (GI) exploits the intensity correlations of light to reconstruct an object. A “ghost image” is obtained by correlating the total transmitted or reflected intensity of an illuminated object with the intensity of a highly-correlated reference beam which itself doesn't interact with the object. Intriguingly, the spatial resolution of the image is provided by the non-interacting reference...
The study of light beams carrying integer orbital angular momentum (OAM) has become ubiquitous during the last two decades because of their unique capability to harness light matter-interaction with applications in different fields such as optical communications, super-resolution imaging, and quantum optics [1]. Alternatively, light beams carrying non-integer OAM have also recently been demonstrated...
The resolution obtained with coherent diffractive imaging (CDI) is limited by a number of factors, one of which is the transverse coherence of the illuminating beam. For a successful reconstruction, it is accepted that the illuminating beam should have a lateral coherence length of at least twice the largest linear dimension of the sample [1].
Metal laser additive manufacturing (LAM) provides unique possibilities for the fabrication of complex parts in many key industrial areas such as aerospace, automotive, and healthcare. However, due to variations in part geometry, local environment, and the inherent stochasticity of the laser melting process, reproducibility in final part morphology and characteristics is a major concern. In this paper,...
Compared to the visible or near-infrared (NIR) spectral regions, there is a lack of very high sensitivity detectors in the mid-infrared (MIR) that operate near room temperature. Upconversion of the MIR light to NIR light that is imaged using affordable, fast, and sensitive NIR detectors or cameras represents an attractive possibility and the technique has been successfully demonstrated using a broad-spectrum...
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