Picosecond Laser-Induced Transient Gratings and Anisotropic State-Filling in Germanium

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We present a comparative theoretical study of the transient grating coherent effects in resonant picosecond excitation-probe experiments. Signals in both the probe and conjugate directions are discussed. The effects of recombination, non-radiative scattering and spatial and orientational diffusion are included. The analysis is applied to both a molecular and to a semiconductor model. Signal contributions from concentration and orientational gratings are distinguished and their temporal natures discussed. The theory is used to explain our recent observations in germanium. Included are discussions of picosecond transient grating self-diffraction measurements that can be understood in terms of an orientational grating produced by anisotropic ... continued below

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vii, 111 leaves : ill.

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Boggess, Thomas F. (Thomas Frederick) December 1982.

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  • Boggess, Thomas F. (Thomas Frederick)

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We present a comparative theoretical study of the transient grating coherent effects in resonant picosecond excitation-probe experiments. Signals in both the probe and conjugate directions are discussed. The effects of recombination, non-radiative scattering and spatial and orientational diffusion are included. The analysis is applied to both a molecular and to a semiconductor model. Signal contributions from concentration and orientational gratings are distinguished and their temporal natures discussed. The theory is used to explain our recent observations in germanium. Included are discussions of picosecond transient grating self-diffraction measurements that can be understood in terms of an orientational grating produced by anisotropic (in k-space) state-filling. Though there have been predictions and indirect experimental evidence for isotropic state-filling in germanium, this is the first direct experimental indication of anisotropic state-filling in a semiconductor.

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vii, 111 leaves : ill.

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  • December 1982

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  • Aug. 22, 2014, 6 p.m.

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  • April 18, 2018, 2:24 p.m.

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Boggess, Thomas F. (Thomas Frederick). Picosecond Laser-Induced Transient Gratings and Anisotropic State-Filling in Germanium, dissertation, December 1982; Denton, Texas. (digital.library.unt.edu/ark:/67531/metadc331261/: accessed July 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .