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Articles by Jason Schmidt
Convolutional neural network for improved event-based Shack-Hartmann wavefront reconstruction
Shack-Hartmann wavefront sensing is a technique for measuring wavefront aberrations, whose use in adaptive optics relies on fast position tracking of an array of spots. These sensors conventionally use frame-based cameras operating at a fixed sampling rate to report pixel intensities, even though only a fraction of the pixels have signal.
Semi-analytic simulation of optical wave propagation through turbulence
Abstract Split-step wave-optical simulations are useful for studying optical propagation through random media like atmospheric turbulence. The standard method involves alternating steps of paraxial vacuum propagation and turbulent phase accumulation. We present a semi-analytic approach to evaluating the Fresnel diffraction integral with one phase screen between the source and observation planes and another screen in the observation plane.
Real-time image restoration for space-object imaging
Abstract Military applications such as optical space surveillance and civilian applications such as astronomical imaging often require adaptive optics to compensate images of distant objects that are dynamically blurred by atmospheric turbulence. Many factors prevent adaptive optics (AO) from restoring a fully diffraction-limited image quality. Accordingly, restoration methods such as blind deconvolution and contrast enhancement are applied to further improve such imagery.
Turbulent phase derivative screens and verification of their statistics
Abstract Turbulent phase screens are commonly used in split-step, wave-optics simulations of light propagation through long atmospheric paths. Here, we describe the generation of turbulent phase gradient and Laplacian screens, as a complement to phase screens. These have applications in split-step, ray-trace simulations through turbulence, and the study of various wavefront sensors. Our method is based on a simple modification of the corresponding phase screens’ Fourier coefficients.
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