Variation of the Positional Angle of the Polarization Plane of Radiosources with Time

Nature ◽  
1967 ◽  
Vol 213 (5076) ◽  
pp. 580-580
Author(s):  
G. B. SHOLOMITSKY
Keyword(s):  
Polarization Plane ◽  
Positional Angle

COMPACT POLARIZATION PLANE ROTATOR AT A GIVEN ANGLE IN THE SQUARE WAVEGUIDE

2017 ◽  
Vol 76 (10) ◽  
pp. 855-864
Author(s):  
D. Yu. Kulik ◽  
S. A. Steshenko ◽  
A. A. Kirilenko
Keyword(s):  
Polarization Plane ◽  
Plane Rotator

scholarly journals Global Ocean Studies from CALIOP/CALIPSO by Removing Polarization Crosstalk Effects

2021 ◽  
Vol 13 (14) ◽  
pp. 2769
Author(s):  
Xiaomei Lu ◽  
Yongxiang Hu ◽  
Ali Omar ◽  
Rosemary Baize ◽  
Mark Vaughan ◽  
...  
Keyword(s):  
Polarization Plane ◽  
Optical Power ◽  
Satellite Observations ◽  
Global Ocean ◽  
Reference Plane ◽  
Orthogonal Polarization ◽  
True Value ◽  
Before And After ◽  
Oriented Parallel ◽  
532 Nm

Recent studies indicate that the Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) aboard the Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) satellite provides valuable information about ocean phytoplankton distributions. CALIOP’s attenuated backscatter coefficients, measured at 532 nm in receiver channels oriented parallel and perpendicular to the laser’s linear polarization plane, are significantly improved in the Version 4 data product. However, due to non-ideal instrument effects, a small fraction of the backscattered optical power polarized parallel to the receiver polarization reference plane is misdirected into the perpendicular channel, and vice versa. This effect, known as polarization crosstalk, typically causes the measured perpendicular signal to be higher than its true value and the measured parallel signal to be lower than its true value. Therefore, the ocean optical properties derived directly from CALIOP’s measured signals will be biased if the polarization crosstalk effect is not taken into account. This paper presents methods that can be used to estimate the CALIOP crosstalk effects from on-orbit measurements. The global ocean depolarization ratios calculated both before and after removing the crosstalk effects are compared. Using CALIOP crosstalk-corrected signals is highly recommended for all ocean subsurface studies.

Liquid crystal cell for space-borne laser rangefinder to space mission applications

2012 ◽  
Vol 20 (4) ◽  
Author(s):  
E. Nowinowski-Kruszelnicki ◽  
L. Jaroszewicz ◽  
Z. Raszewski ◽  
L. Soms ◽  
W. Piecek ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Polarization Plane ◽  
Space Mission ◽  
Liquid Crystal Cell ◽  
Laser Rangefinder ◽  
Aperture Diameter ◽  
Crystal Cell ◽  
University Of Technology ◽  
Twisted Nematic ◽  
Space Requirements

AbstractLiquid crystal cell (LCC) for space-borne laser rangefinder to space mission applications was developed, manufactured and tested under cooperation between Military University of Technology (MUT) in Poland and Vavilov State Optical Institute (Vavilov SOI) in Russia. LCC operates in twisted nematic mode, commutating the polarization plane of a laser beam working at 1.064 μm and the energy density not smaller than 0,15 J/cm2 at the pulse duration about 8 ns. The transmission of LCC is not smaller than 95% at the aperture diameter not less than 15 mm. Switching on and switching off times in a 2.5-μm thick LCC driven by voltage of 10 V are not larger than 0.7 ms and 7 ms, respectively, in the operating temperature range from 20°C to 40°C. The LCCs developed in MUT were positively tested under space requirements in Vavilov SOI.

Measuring the position of the polarization plane of solar coronal emission during eclipse observations

2003 ◽  
Vol 47 (10) ◽  
pp. 883-887
Author(s):  
M. M. Molodensky ◽  
V. L. Merzlyakov ◽  
L. I. Starkova
Keyword(s):  
Polarization Plane ◽  
Coronal Emission ◽  
Eclipse Observations ◽  
Solar Coronal

scholarly journals Constraints on Lorentz Invariance Violation with Multiwavelength Polarized Astrophysical Sources

Galaxies ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 44
Author(s):  
Qi-Qi Zhou ◽  
Shuang-Xi Yi ◽  
Jun-Jie Wei ◽  
Xue-Feng Wu
Keyword(s):  
Gamma Ray ◽  
Lorentz Invariance ◽  
Polarized Light ◽  
Polarization Plane ◽  
Polarization Angle ◽  
Intrinsic Polarization ◽  
Frequency Dependent ◽  
Invariance Violation ◽  
Linearly Polarized ◽  
Order Of Magnitude

Possible violations of Lorentz invariance (LIV) can produce vacuum birefringence, which results in a frequency-dependent rotation of the polarization plane of linearly polarized light from distant sources. In this paper, we try to search for a frequency-dependent change of the linear polarization angle arising from vacuum birefringence in the spectropolarimetric data of astrophysical sources. We collect five blazars with multiwavelength polarization measurements in different optical bands (UBVRI). Taking into account the observed polarization angle contributions from both the intrinsic polarization angle and the rotation angle induced by LIV, and assuming that the intrinsic polarization angle is an unknown constant, we obtain new constraints on LIV by directly fitting the multiwavelength polarimetric data of the five blazars. Here, we show that the birefringence parameter η quantifying the broken degree of Lorentz invariance is limited to be in the range of −9.63×10−8<η<6.55×10−6 at the 2σ confidence level, which is as good as or represents one order of magnitude improvement over the results previously obtained from ultraviolet/optical polarization observations. Much stronger limits can be obtained by future multiwavelength observations in the gamma-ray energy band.

ROTATIONAL PROPERTIES OF MICRO-SLABS DRIVEN BY LINEARLY-POLARIZED LIGHT

2005 ◽  
Vol 14 (03) ◽  
pp. 375-382 ◽  
Author(s):  
CHIH-LANG LIN ◽  
IRÈNE WANG ◽  
MARC PIERRE ◽  
ISABELLE COLOMBIER ◽  
CHANTAL ANDRAUD ◽  
...  
Keyword(s):  
Optical Tweezers ◽  
Polarized Light ◽  
Polarization Plane ◽  
Light Polarization ◽  
Good Prediction ◽  
Polarization Anisotropy ◽  
Two Photon ◽  
Flat Slabs ◽  
Linearly Polarized ◽  
Optical Torque

We study the rotational motion of objects trapped in a focused laser beam (optical tweezers). Micrometer-sized flat slabs are fabricated using two-photon photopolymerization. These objects, trapped by linearly-polarized light, tend to align parallel to the polarization plane. This alignment effect is attributed to the polarization anisotropy resulting from the object shape and we present a simple electromagnetic approach to estimate the resulting optical torque. Micro-rotors of different sizes are studied experimentally. We characterize the behavior of micro-objects when the light polarization is rotated at constant speed. Our theoretical approach gives a good prediction of how the size of micro-objects affects their rotation efficiency.

Complex form of recording an elliptically polarized wave

2010 ◽  
Vol 3 (2) ◽  
pp. 118-122
Author(s):  
Evgeny V. Baklanov
Keyword(s):  
Phase Angle ◽  
Polarization Plane ◽  
Complex Form ◽  
Elliptically Polarized

The field of an elliptically polarized wave is written down in the form of, convenient for the analysis of practical problems. The amplitude of the wave is expressed through four parameters: module, phase, angle of polarization plane, and ellipticity (a ratio of the ellipse axes).

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