Biomedical subjects

Mircea Mujat

Publications and source records attributed to Mircea Mujat.

4 recordsLinked to original sources

PubMed2004

Interferometric measurement of the degree of polarization and control of the contrast of intensity fluctuations.

We introduce a technique for determining the polarimetric characteristics of light by measuring the contrast of the intensity fluctuations in an interferometric setup. The method permits simultaneous measurement of the degree of polarization and of the second normalized Stokes component, which is related to the ellipsometric parameters azimuth and ellipticity, based on only two measurements. We also show that by using. phase modulation we can increase the signal-to-noise ratio as much as 40% under certain conditions.

Journal Article↗

PubMed2004

Interferometric imaging polarimeter.

We describe a new imaging polarimeter that is based on a modified Sagnac interferometer and allows full polarimetric description of complex random electromagnetic beams from only two images as compared with the four images needed in conventional polarimetry. The procedure is analyzed in terms of the interference laws of Fresnel and Arago, and very good agreement with standard Stokes polarimetry is demonstrated. In certain cases the new technique provides the degree of polarization and the retardance from only one image.

Journal Article↗

PubMed2004

A law of interference of electromagnetic beams of any state of coherence and polarization and the Fresnel-Arago interference laws.

A new general interference law is derived for the superposition of two random electromagnetic beams of any state of coherence and of any state of polarization when the beams are transmitted through polarizers and rotators. It includes, as special cases, a variety of interference laws that apply to particular situations. Some of them have a close bearing on the classic interference experiments of Fresnel and Arago that have played a basic role in elucidating the concept of polarization of light.

Journal Article↗

PubMed2003

Polarimetric and spectral changes in random electromagnetic fields.

Beginning with a recently formulated unified theory of coherence and polarization for random electromagnetic fields, we show how partially polarized light can be generated through correlation of unpolarized components. The effect is demonstrated by use of a Mach-Zehnder interferometer, showing the possibility of producing light with adjustable spectral density and an adjustable degree of polarization.

Journal Article↗