Vassilis Zarifis

TL;DR: The flight-test results for two coherent lidar airborne shear sensor (CLASS) systems are described and their agreement with theoretical simulations is discussed.

TL;DR: A nine-aperture, wide-field Fizeau imaging telescope has been built at the Lockheed-Martin Advanced Technology Center and the optical design of the telescope and typical performance results are described.

TL;DR: In this paper, a simulation of phase-diverse wavefront sensing is presented as a demonstration of the robustness of the method with respect to sparse pupil and wavelength sampling, and a closed-loop experiment is conducted that demonstrates the ability of phase diversity to sense piston error and maintain the alignment of the phasedarray system.

TL;DR: In this paper, a phase diversity wavefront correction system for use in a multiple aperture optical imaging system is presented, where two images are processed to create one or more metrics, such as the power metric and sharpness metric, and neural networks are trained to identify a subset of elements within the metrics that, when input into the network, produce the best estimate of the piston or tip/tilt position relative to a reference telescope.

TL;DR: In this paper, the effects upon imaging due to varying the spatial coherence of the illumination in an optical system are studied, where a rotating diffuser is located directly behind the object in an image and is trans-illuminated with spatially coherent monochromatic light.