Optical polarization

About: Optical polarization is a research topic. Over the lifetime, 13992 publications have been published within this topic receiving 244284 citations.

Analytic inversion of the Mueller-Jones polarization matrices for homogeneous media.

Abstract: In this Letter we present the equations to calculate the six independent polarization effects of an arbitrary normalized Mueller-Jones matrix corresponding to homogenous media. A comparison between this method and other inversion procedures is discussed, and the application of the analytic inversion to experimental Mueller matrices is illustrated.

Optical polarization singularities and elliptic stationary points.

Abstract: Polarization singularities and elliptic stationary points (collectively, elliptic critical points) were measured experimentally via the complex Stokes field S1 + iS2, where S1 and S2 are Stokes parameters This new, easily implemented method yielded detailed, high-resolution experimental data for all elliptic critical points These data confirm with high precision the elliptic-field topological sign rule, loop rules, and Stokes singularity relations introduced recently

Evaluation of Novel Assays in Clinical Chemistry: Quantification of Plasma Total Homocysteine

Abstract: Background: There is a need for systematic evaluation of methods before their release to the market. We addressed this problem in novel homocysteine assays as part of an European Demonstration Project involving six centers in four countries. Methods: Two immunological methods for measurement of plasma total homocysteine (P-tHcy), the fluorescence polarization immunoassay (FPIA) and the enzyme immunoassay (EIA), were compared with two comparison methods, HPLC and gas chromatography–mass spectrometry (GC-MS). All laboratories performed the following procedures: ( a ) familiarization; ( b ) determination of linearity and precision by analyzing five plasma samples with interrelated concentrations for 20 days; ( c ) correlation using patients’ samples; and ( d ) assessment of long-term performance. Results: Both immunological methods were linear for P-tHcy between 5 and 45 μmol/L. The intralaboratory imprecision (CV) was <5% for FPIA and <9% for EIA used with a sample processor. The bias was −2% to 3% for FPIA and 2–4% for EIA used with a sample processor. Conclusions: The immunological methods provide results with little bias compared with HPLC and GC-MS. The imprecision of the assays must be considered in the context of their intended use(s).

Optical studies of laser-induced gray-tracking in KTP

Abstract: We have studied gray-tracking induced by a pulsed and polarized 532-nm laser beam in flux grown KTiOPO/sub 4/ (KTP) crystals. Transmission spectra measured under polarized light give different results: gray-tracking leads to an increase in the initial anisotropy of the linear optical properties of KTP, and the polar axis is the most sensitive to this process. The dynamics of relaxation of gray-tracking is anisotropic and depends on the wavelength under analysis. We show a possible induced modification of the crystal surface and also the existence of an intensity above which gray-tracking reaches the saturation point. We then measure the temperature above which gray-tracking no longer exists.