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Wagner, Kelvin H.

Professor

Positions

Research Areas research areas

Research

research overview

  • Prof. Wagner performs research to harness the unique computational capabilities of linear and nonlinear optical interactions of light with novel materials in order to produce optical systems with unprecedented computational power. Holographic optical signal processing is performed using photorefractive materials. Spatial-temporal holographic processing for applications such as true-time-delay squint-free multibeam array processing, high resolution spectral analysis, and radar range-Doppler and angle-of-arrival signal processing is performed using spatial-spectral holography. New acousto-optic devices are being invented and developed for these and other applications in optical and quantum computing. Silicon photonics is being used for 2-dimensional beam steering based on a novel serpentine optical phased array for a new type of lidar system based on computational imaging from an array of such beam steering tiles. This advanced multibeam interferometric computational lidar system is being extended to the quantum regime through a new type of coded photon counting.

keywords

  • optical computing, optical signal processing, optical neural networks, spatial-spectral holography, acousto-optics, nonlinear optics, Lidar, silicon photonics

Publications

selected publications

Teaching

courses taught

  • ECEN 3300 - Linear Systems
    Primary Instructor - Spring 2018 / Spring 2019 / Spring 2020
    Characterization of linear time-invariant systems in time and frequency domains. Continuous time systems are analyzed using differential equations and Laplace and Fourier transforms. Discrete time systems are analyzed using difference equations, Z-transforms and discrete time Fourier transforms. Sampling and reconstruction of signals using the sampling theorem. Applications of linear systems include communications, signal processing, and control systems. Degree credit not granted for this course and ECEN 3301.
  • ECEN 4606 - Undergraduate Optics Laboratory
    Primary Instructor - Fall 2021
    Introduces fundamental concepts, techniques, and technology of modern optical and photonic systems. Individual labs cover particular fields of optical technology, including light sources such as lasers and Leds, interferometers, fiber-optic communications, photodetection, spectrometers, and holography. Practical skills such as how to align an optical system will also be emphasized.
  • ECEN 5156 - Physical Optics
    Primary Instructor - Fall 2018 / Fall 2020 / Fall 2024
    Covers the application of Maxwell's equations to optical wave propagation in free space and in media.Topics include polarization, dispersion, geometrical optics, interference, partial coherence, and diffraction. Recommended prerequisite: ECEN 3410.
  • ECEN 5606 - Optics Laboratory
    Primary Instructor - Spring 2018 / Spring 2022
    Provides advanced training in experimental optics. Consists of optics experiments that introduce the techniques and devices essential to modern optics, including characterization of sources, photodetectors, modulators, use of interferometers, spectrometers,and holograms and experimentation of fiber optics and Fourier optics. Department enforced prerequisite: undergraduate optics course (e.g. PHYS 4510). Same as PHYS 5606.
  • ECEN 5696 - Fourier Optics
    Primary Instructor - Fall 2019 / Fall 2021 / Fall 2023
    Introduces a system level approach to the analysis and design of optical systems. Topics include holography, Fourier transform properties of lenses, two-dimensional convolution and correlation functions, spatial filtering and optical computing techniques. Also covers coherent and incoherent imaging techniques, tomography, and synthetic aperture imaging. Recommended prerequisites: ECEN 3300 and ECEN 3410.
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