C
C. A. Walsh
Researcher at IBM
Publications - 34
Citations - 2157
C. A. Walsh is an academic researcher from IBM. The author has contributed to research in topics: Photorefractive effect & Grating. The author has an hindex of 14, co-authored 33 publications receiving 2127 citations.
Papers
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Journal ArticleDOI
Second-order nonlinearity in poled-polymer systems
Journal ArticleDOI
Orientational decay in poled second‐order nonlinear optical guest‐host polymers: Temperature dependence and effects of poling geometry
TL;DR: In this paper, the second harmonic generation (SHG) was used to probe the decay of the electric field poling induced alignment of polyimides and other polymeric hosts, and the decay rate of the SHG signal was measured as a function of temperature below the glass transition in a wide variety of different polymer host systems.
Journal ArticleDOI
Net two-beam-coupling gain in a polymeric photorefractive material.
M. C. J. M. Donckers,S. M. Silence,C. A. Walsh,François Hache,Donald M. Burland,W. E. Moerner,Robert J. Twieg +6 more
TL;DR: Two-beam-coupling gain coefficients exceeding the absorption coefficient are demonstrated for the first time to the authors' knowledge in an organic photorefractive system, significantly better than that of any previously described organic.
Journal ArticleDOI
C60 sensitization of a photorefractive polymer
TL;DR: In this article, the fullerene molecule C60 is shown to act as a useful sensitizer of a recently discovered photorefractive polymer, and the sensitization appears to result from a small increase in the carrier generation efficiency and a larger increase in useful optical absorption at the operating wavelength, 647 nm.
Journal ArticleDOI
Two-beam coupling measurements of grating phase in a photorefractive polymer
C. A. Walsh,W. E. Moerner +1 more
TL;DR: In this paper, the grating properties of a recently discovered organic photorefractive polymer as a function of electric field were investigated using two-beam coupling, using an oblique-incidence geometry, and measurements of index and absorption grating phase relative to the intensity interference pattern as well as measurements of amplitude of both the absorption and index gratings.