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Search Publications by: Eric L. Shirley (Fed)

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Displaying 101 - 125 of 185

Diffraction Corrections in Radiometry: A Proposed Method to Estimate Uncertainties

January 1, 2002
Author(s)
Eric L. Shirley, Raghu N. Kacker, Raju V. Datla
Radiometric determination of certain quantities, such as source radiance, geometrical aspects of an optical system (e.g., throughput, aperture areas and detector response relies heavily on the mathematical principles governing geometrical optics. These

Excitonic Effects on Optical Second-Harmonic Polarizabilities of Semiconductors

January 1, 2002
Author(s)
E K. Chang, Zachary H. Levine, Eric L. Shirley
We present an ab initio many-body formalism for computing the frequency-dependent second-harmonic polarizability of semiconductor materials that includes both local-field and excitonic effects. We calculate the second-harmonic polarizability for AIP, AIAs

Hidden in Plain Sight: Calcium Fluoride's Intrinsic Birefringence

December 1, 2001
Author(s)
John H. Burnett, Zachary H. Levine, Eric L. Shirley
We discuss the phenomena of intrinsic birefringence in cubic crystals that we first characterized experimentally and theoretically in ultraviolet optical materials. We analyze the wavelength dependence, the angular dependence, and symmetry of the effect

Intrinsic Birefringence in Calcium Fluoride and Barium Floride

December 1, 2001
Author(s)
John H. Burnett, Zachary H. Levine, Eric L. Shirley
We have measured an intrinsic birefringence in calcium fluoride in the ultraviolet for wavelengths from 365 nm down to 156 nm, and compared these results with theory and calculations. The measured effect is largest for propagation in the [110] direction

Fraunhofer Diffraction Effects on Total Power for a Planckian Source

October 1, 2001
Author(s)
Eric L. Shirley
An algorithm for computing diffractions effects on total power in the case of Fraunhofer diffraction by a circular lens or aperture is derived. The result for Fraunhofer diffraction of monochromatic radiation is well known, and this reports the result for

Scheme to Calculate Core Hole-Electron Interactions in Solids

October 1, 2001
Author(s)
J A. Soininen, Eric L. Shirley
We present a first-principles scheme for calculating a core-hole potential for core electron excitations. The scheme incorporates atomic and solid-state screening in the description of core excitations in several materials.We compare the results calculated

Core-Hole-Electron Interaction in X-Ray Raman Scattering

September 1, 2001
Author(s)
J A. Soininen, K Hamalainen, W A. Caliebe, C C. Kao, Eric L. Shirley
This work applies a recently developed first-principles scheme for calculating core-excited states in solids tonon-resonant inelastic x-ray scattering. Within the computational scheme the interaction between the excited electron and the core hole is

Nonresonant Inelastic X-Ray Scattering Study of Cubic Boron Nitride

July 1, 2001
Author(s)
S Galambosi, J A. Soininen, K Hamalainen, Eric L. Shirley, C C. Kao
During the recent years boron nitride has been extensively studied via numerous experimental techniques because it exhibits several fascinating characteristics such as semiconducting properties, extreme hardness, high thermal conductivity and large band