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Search Publications by: Paul A. Williams (Fed)

Displaying 101 - 111 of 111

X-ray Observation of Electroclinic Layer Constriction and Rearrangement in a Chiral Smetic-A Liquid Crystal

July 17, 1995

Author(s)

A. G. Rappaport, Paul A. Williams, B. N. Thomas, N. A. Clark, M. B. Ros, D. M. Walba

Dielectric Spectroscopic Determination of Temperature Behavior of Electroclinic Parameters in the Liquid Crystal W317

July 1, 1995

Author(s)

Paul A. Williams, N. A. Clark

Anomalous relation between time and frequency domain PMD measurements

January 1, 1995

Author(s)

Paul A. Williams, P. R. Hernday

We report nearly simultaneous measurements of polarization mode dispersion (PMD) in various samples of highly mode-coupled single-mode fiber using the measurement methods of Jones matrix eigenanalysis (JME) and Fourier-transformed wavelength scanning. The

Standard Polarization Components: Progress Toward an Optical Retardance Standard

January 1, 1994

Author(s)

Kent B. Rochford, Paul A. Williams, Allen Rose, I. G. Clarke, Paul D. Hale, Gordon W. Day

Magneto-optic characterization of iron garnet crystals using photoelastic modulation

April 1, 1993

Author(s)

M. N. Deeter, Paul A. Williams

Depolarization phenomena in demagnetized bulk iron garnet crystals are investigated with the aid of a photoelastic modulator. An experimental configuration which simultaneously measures Faraday rotation and depolarization as a function of applied magnetic

Studies of the Higher Order Smectic Phase of the Large Electroclinic Effect Material W317

January 1, 1993

Author(s)

Paul A. Williams, L. Komitov, A. G. Rappaport, B. N. Thomas, N. A. Clark, D. M. Walba, Gordon W. Day

Compensation for the temperature dependence of the faraday effect in diamagnetic materials: application to optical fibre sensors

June 20, 1991

Author(s)

Paul A. Williams, Gordon W. Day, Allen Rose

The temperature dependence of the Faraday effect in a diamagnetic material can be compensated for by varying the polarization state of the light entering the material as a function of temperature. We demonstrate that this can be done automatically by

Temperature Dependence of the Verdet Constant in Several Diamagnetic Glasses

April 1, 1991

Author(s)

Paul A. Williams, Allen Rose, Gordon W. Day, M. N. Deeter, T E. Milner

Large electroclinic effect in new liquid crystal material

January 1, 1991

Author(s)

Paul A. Williams, M. B. Ros, N. A. Clark, R. T. Vohra, D. M. Walba, M. D. Wand

We report a new liquid crystal material (W317) which has an unusually large electroclinic effect in a phase tentatively identified as smectic A. We show electroclinic tilt angles as large as 21 °, and measurable tilt angles over a 40°C temperature range.

Development of a miniature radiation pressure-measuring microscale

Author(s)

Ivan Ryger, Alexandra B. Artusio-Glimpse, Paul A. Williams, Nathan A. Tomlin, Michelle S. Stephens, Matthew T. Spidell, John H. Lehman

Traditional methods for accurate measurement of high-power lasers involve total absorption of the laser light [1]. Our method, however, measures photon pressure exerted on a mirror without obstruction of the laser beam. The technique enables in situ

Feedback control of a nonlinear electrostatic force transducer

Author(s)

Ivan Ryger, Stefan Chamraz, Richard Balogh, Alexandra B. Artusio-Glimpse, Michelle S. Stephens, John H. Lehman, Paul A. Williams

In this article, we document a design process for a feedback controller for a nonlinear electrostatic transducer that exhibits a strong unloaded resonance. This is being used for precision optical power measurement by means of a photon force measurement