Physics Faculty Works

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https://hdl.handle.net/1794/26332

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Browsing Physics Faculty Works by Author "Allgaier, Markus"

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    Diffuse optics for glaciology
    (Optical Society of America, 2021-06) Allgaier, Markus; Smith, Brian J.
    Optical probing of glaciers has the potential for tremendous impact on environmental science. However, glacier ice is turbid, which prohibits the use of most established optical measurements for determining a glacier’s interior structure. Here, we propose a method for determining the depth, scattering and absorption length based upon diffuse propagation of short optical pulses. Our model allows us to extract several characteristics of the glacier. Performing Monte Carlo simulations implementing Mie scattering and mixed boundary conditions, we show that the proposed approach should be feasible with current technology. The results suggest that the optical properties and geometry of the glacier can be extracted from realistic measurements, which could be implemented with a low cost and small footprint.
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    Temporal mode transformations by sequential time and frequency phase modulation for applications in quantum information science
    (Optica Publishing Group, 2020-12-04) Ashby, James; Thiel, Valérian; Allgaier, Markus; d'Ornellas, Peru; Davis, Alex O. C.; Smith, Brian J.
    Controlling the temporal mode shape of quantum light pulses has wide ranging application to quantum information science and technology. Techniques have been developed to control the bandwidth, allow shifting in the time and frequency domains, and perform mode-selective beam-splitter-like transformations. However, there is no present scheme to perform targeted multimode unitary transformations on temporal modes. Here we present a practical approach to realize general transformations for temporal modes. We show theoretically that any unitary transformation on temporal modes can be performed using a series of phase operations in the time and frequency domains. Numerical simulations show that several key transformations on temporal modes can be performed with greater than 95% fidelity using experimentally feasible specifications.