Showing papers on "Polarization rotator published in 1980"
TL;DR: In this article, the polarization characteristics of undulator radiation were investigated and it was shown that the radiation is linearly polarized for each harmonic and that the plane of polarization is dependent on the azimuth of the observing direction as well as the angle of deviation θ from the beam axis.
Abstract: The polarization characteristics of undulator radiation were investigated. Calculation shows that the radiation is linearly polarized for each harmonic and that the plane of polarization is dependent on the azimuth of the observing direction as well as the angle of deviation θ from the beam axis. When the observation is made at small θ values compared to the reciprocal of the relativistic beam energy γ, the radiation is polarized nearly in the orbital plane, while at larger θ values the plane of polarization rotates with the aximuth.
40 citations
38 citations
TL;DR: In this paper, a lithium-6 atomic beam is spin-polarized by means of optical pumping with a single-mode dye laser operating on the resonance transition, which is achieved by frequency-splitting the laser light with an acousto-optic modulator.
Abstract: A lithium-6 atomic beam is spin-polarized by means of optical pumping with a single-mode dye laser operating on the resonance transition. Simultaneous pumping of both hyperfine substates is achieved by frequency-splitting the laser light with an acousto-optic modulator. A polarization dependent signal, obtained by probing the optical activity of the beam with linearly polarized light, is utilized in a microprocessor-controlled laser stabilization scheme. The polarization is analyzed with a sextupole magnet and its overall value is 0.70 for an intensity of 1×1014 atms s−1. By reversing the sense of circular polarization of the pumping light the atomic beam polarization is easily reversed in direction.
29 citations
TL;DR: In this paper, the spectral and polarization characteristics of undulator radiation were investigated and it was found that the radiation was linearly polarized for each harmonic and the plane of polarization dependent on the direction of observation.
10 citations
TL;DR: In this article, a liquid crystal polarization rotator (LCPR) is proposed to reduce the intermodulation spatial-bandwidth in offset-reference holography, where the rotation angle is set so that the direction of polarization of the transmitted light beams make an angle 90° with each other.
9 citations
9 citations
TL;DR: In this paper, it is shown that non-uniform polarization distributions over the beam profile give sizeable effects even if the average transverse polarization vanishes, and the necessary information can be obtained by measuring four suitably chosen one-dimensional intensity and polarization distributions within the beam.
7 citations
TL;DR: In this paper, conditions for ensuring compensation of nonlinear distortions of elliptically polarized beams by wavefront reversal were found and several ways of achieving such compensation and they reduce to wave front reversal which conserves the polarization structure and is characterized by near-unity reflection coefficients as well as additional rotation of the polarization vectors.
Abstract: Conditions are found for ensuring compensation of nonlinear distortions of elliptically polarized beams by wavefront reversal. It is shown that, in contrast to the case of linear polarization, there are several ways of achieving such compensation and they reduce to wavefront reversal which conserves the polarization structure and is characterized by near-unity reflection coefficients as well as additional rotation of the polarization vectors.
6 citations
30 Jan 1980
TL;DR: Theoretical analysis reveals frequency bands with near homogeneous eigenstates suitable for polarization filtering as discussed by the authors, and a total dynamic range of 80 dB has been achieved in an acousto-optic device operating from 40 to 80 MHz.
Abstract: Studies on polarization switching in shear wave Te02 Bragg cells indicate that background rejection through polarization filtering is possible. Theoretical analysis reveals frequency bands with near homogeneous eigenstates suitable for polarization filtering. Experimental results confirm a background scatter reduction of 13 dB with polarization filtering. A total dynamic range of 80 dB has been achieved in an acousto-optic device operating from 40 to 80 MHz.© (1980) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
5 citations
5 citations
TL;DR: In this article, the spectral thermal emission from ferromagnetic iron is partially circular polarized and an interpretation based on the principle of detailed balance (Kirchhoff's law) and within the framework of Maxwell's electrodynamic theory is given.
02 Jun 1980
TL;DR: In this article, an experimental method for determining the polarization ratio K for crystal monochromators is described, and the choice of a suitable crystal is discussed in terms of the theory of the method and from a practical point of view.
Abstract: An experimental method for determining the polarization ratio K for crystal monochromators is described. Apart from a diffractometer, no additional equipment is required to perform the experiment other than a single crystal. The choice of a suitable crystal is discussed in terms of the theory of the method and from a practical point of view. It is shown that, in the absence of extinction and under certain easily attainable conditions, the crystal can be irregular in shape, of unknown dimensions and highly absorbing. The method has been tested on modelled data and applied in the determination of K for three wavelengths of radiation. The method may be adapted to powder diffractometry. A seemingly simpler method of determining K by least-squares refinement techniques gave unsatisfactory results.
TL;DR: In this paper, an analysis of the photoelectron spin-polarization and ionization rate performed within the perturbation-method regime for atom interaction and including spin-orbit effects was performed.
Abstract: Near-resonant two-photon ionization of spin-polarized ground state slkali is much richer in various light polarization effects than that of spin-unpolarized ones This is inferered from an analysis of the photoelectron spin-polarization and ionization rate performed within the perturbation-method regime for atom interaction and including spin-orbit effects
TL;DR: In this paper, the polarization change induced by saturated absorption and dispersion in an internal gas cell using elliptically polarized light produced by a phase retarder and Brewster plates inside the laser resonator was studied.
01 Apr 1980
TL;DR: In this paper, the authors investigated the circular polarization of atomic transitions after the interaction of fast nitrogen ions with a solid surface at grazing incidence at energies for the incident ions from 0.4 up to 15 MeV, and found that large degrees of circular polarization in the visible part of the spectrum are found so that the application of this technique for producing nuclear spin polarized ions is feasible.
Abstract: The circular polarization of atomic transitions after the interaction of fast nitrogen ions with a solid surface at grazing incidence is investigated at energies for the incident ions from 0.4 up to 15 MeV. Large degrees of circular polarization in the visible part of the spectrum are found so that the application of this technique for producing nuclear spin polarized ions is feasible.
TL;DR: In this article, a theoretical study of the polarization properties of superradiance emitted by gases in a high-current longitudinal discharge is presented, where it is shown that the Zeeman effect in the discharge current makes the radiation at the periphery of a light beam totally polarized.
Abstract: A theoretical study is made of the polarization properties of superradiance emitted by gases in a high-current longitudinal discharge. It is shown that the Zeeman effect in the discharge current makes the radiation at the periphery of a light beam totally polarized. Formulas are derived for relating the degree of polarization of a light beam with the dependences of the gain profile on the frequency and on the transverse coordinate. An analysis is made of the influence of diffraction on the polarization properties of a light beam and the anisotropic waveguide modes are found. A calculation is made of the distribution of the intensity of the optical field when radiation is generated between crossed Polaroids at the exit end of the discharge tube.