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Changes in the polarization states of random electromagnetic vortex beams propagating in biological tissues

Duan M., Wu Y., Su N.

Optica Applicata

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2018

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Vol. 48, nr 2

297--309

EN

The changes in the on-axis polarization state of random electromagnetic Gaussian Schell-model vortex beams propagating in biological tissues have been studied. In different media propagation, the bigger Cn2 is, the earlier the appearance of the inflexion points in the on-axis degree of the polarization P(0, 0, z) is. As the propagation distance increases, the values of the on-axis orientation angle θ(0, 0, z) undergo several processes: at the beginning they are positive, then gradually increase to the maximum, jump to a negative value, finally tend to a fixed value. The bigger Cn2 corresponds to previous jumping position. In the entire propagation, the values of the on-axis ellipticity ε(0, 0, z) are larger than the initial one. There exists a phenomenon that the values of P(0, 0, z), θ(0, 0, z) and ε(0, 0, z) keep their extremes in a length of propagation distances for the far infrared beams. The maximum of P(0, 0, z) is the smallest and the jumping range of θ(0, 0, z) is the largest for the ultraviolet beams. Compared with σyy > σxx, the changes in magnitudes in P(0, 0, z) are more obvious when σyy < σxx, the changes in θ(0, 0, z) are just the reverse for σyy < σxx.

2

Metrology of degree of coherence of circularly polarized optical waves

Zenkova C. Y., Gorsky M. P., Gorodynska N. V.

Opto-Electronics Review

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2011

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Vol. 19, No. 3

290-295

EN

The use of the method of field polarization modulation for defining the degree of coherence of circularly polarized waves is offered. The role of the reference circularly polarized wave in transforming the spatial distribution of polarization into the depth of visibility modulation of the resulting distribution, which can be metrologically estimated and analyzed, is demonstrated.

3

Optical fiber sensors of magnetic field applying Faraday’s effect

Pustelny T., Tyszkiewicz C., Barczak K.

Optica Applicata

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2003

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Vol. 33, nr 2-3

469-475

EN

This work presents a system for measuring magnetic field intensity. The idea of measurements is based on the influence of an external magnetic field on the polarization state of single-mode light propagated along optical fibers. In the paper, some experimental results of test investigations for the measurements of the magnetic field of high intensity are presented. The ultimate aim of the investigation outlined below is to work out magnetic field intensity sensors which, together with optical fiber temperature sensors and electric field intensity sensors, will make it possible, in the nearest future, to entirely monitor the operation of electromagnetic power units such as, e.g., high voltage power transformers

4

The New Method for Light Polarisation State Determination and Their Application for Magnetooptical Effect Investigations

Pustelny T., Tyszkiewicz C., Barczak K.

Molecular and Quantum Acoustics

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2001

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Vol. 22

203-212

EN

This work presents the new method that allows determining the ellips of polarisation. Therefore is allows determining the state of polarisation. This paper also shows how apply presented mathod in designing the fiber optic magnetic field sensors.