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The University of San Francisco

Signal processing

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Full-Text Articles in Physical Sciences and Mathematics

Rare-Earth-Doped Materials With Application To Optical Signal Processing, Quantum Information Science, And Medical Imaging Technology, R L. Cone, C W. Thiel, Y Sun, Thomas Böttger, R M. Macfarlane Jan 2012

Rare-Earth-Doped Materials With Application To Optical Signal Processing, Quantum Information Science, And Medical Imaging Technology, R L. Cone, C W. Thiel, Y Sun, Thomas Böttger, R M. Macfarlane

Physics and Astronomy

Unique spectroscopic properties of isolated rare earth ions in solids offer optical linewidths rivaling those of trapped single atoms and enable a variety of recent applications. We design rare-earth-doped crystals, ceramics, and fibers with persistent or transient “spectral hole” recording properties for applications including high-bandwidth optical signal processing where light and our solids replace the high-bandwidth portion of the electronics; quantum cryptography and information science including the goal of storage and recall of single photons; and medical imaging technology for the 700-900 nm therapeutic window. Ease of optically manipulating rare-earth ions in solids enables capturing complex spectral information in 105 …


Material Optimization Of Er3+Y2sio5 At 1.5 Μm For Optical Processing, Memory, And Laser Frequency Stabilization Applications, Thomas Böttger, Y Sun, C W. Thiel, R L. Cone Jan 2003

Material Optimization Of Er3+Y2sio5 At 1.5 Μm For Optical Processing, Memory, And Laser Frequency Stabilization Applications, Thomas Böttger, Y Sun, C W. Thiel, R L. Cone

Physics and Astronomy

Spatial-spectral holography using spectral hole burning materials is a powerful technique for performing real-time, wide-bandwidth information storage and signal processing. For operation in the important 1.5 μm communication band, the material Er3+:Y2SiO5 enables applications such as laser frequency stabilization, all-optical correlators, analog signal processing, and data storage. Site-selective absorption and emission spectroscopy identified spectral hole burning transitions and excited state T1 lifetimes in the 1.5 μm spectral region. The effects of crystal temperature, Er3+-dopant concentration, magnetic field strength, and crystal orientation on spectral diffusion were explored using stimulated photon echo spectroscopy, which is the “prototype” interaction mechanism for device applications. …