Phase retarder for transformation of polarization of high-power infrared laser beams based on resonant excitation of surface electromagnetic waves on metallic diffraction gratings

1994 ◽  
Vol 33 (10) ◽  
pp. 3145 ◽  
Author(s):  
Vladimir N. Okorkov
Keyword(s):  
High Power ◽  
Electromagnetic Waves ◽  
Diffraction Gratings ◽  
Infrared Laser ◽  
Resonant Excitation ◽  
Laser Beams ◽  
Surface Electromagnetic Waves

On-chip near-wavelength diffraction gratings for surface electromagnetic waves

2017 ◽  
Author(s):  
Evgeni A. Bezus ◽  
Vladimir V. Podlipnov ◽  
Andrey A. Morozov ◽  
Leonid L. Doskolovich
Keyword(s):  
Electromagnetic Waves ◽  
Diffraction Gratings ◽  
Surface Electromagnetic Waves ◽  
On Chip

scholarly journals Resonant excitation of the upper hybrid wave by relativistic cross focusing of two laser beams

2009 ◽  
Vol 27 (3) ◽  
pp. 429-437 ◽  
Author(s):  
Gunjan Purohit ◽  
Prashant Chauhan ◽  
R.P. Sharma
Keyword(s):  
Magnetic Field ◽  
Static Magnetic Field ◽  
High Power ◽  
Resonant Excitation ◽  
Laser Beams ◽  
High Power Laser ◽  
Hybrid Wave ◽  
Power Laser ◽  
Plasma Parameters ◽  
Hybrid Frequency

AbstractThis article presents the resonant excitation of the upper hybrid wave (UHW) by cross focusing of two high power laser beams in a collisionless hot magnetoplasma; taking into account the relativistic nonlinearity. The electric vectors of the two beams are polarized along uniform static magnetic field and the beams propagate perpendicular to the static magnetic field. The resonant excitation of the UHW occurs when the frequency difference (FD) of the two laser beams and difference of their propagation vector satisfy the dispersion relation corresponding to the UHW. It has been observed that the power associated with the excited UHW, which depends on the background electron concentration, magnetic field and the intensity of the two laser beams, becomes drastically modified with the distance of propagation. The effect of the excited UHW at the FD on the acceleration of electrons has also been discussed. The amplitude of the UHW, excited by two high power laser beams and the electron energy are also calculated. This study is relevant in heating of plasma near the upper hybrid frequency as well as electron acceleration. The results are presented for typical laser plasma parameters.

scholarly journals Integrated high-contrast diffraction gratings for surface electromagnetic waves

2021 ◽  
Vol 2015 (1) ◽  
pp. 012037
Author(s):  
L L Doskolovich ◽  
E A Bezus ◽  
D A Bykov
Keyword(s):  
Electromagnetic Waves ◽  
Diffraction Gratings ◽  
High Contrast ◽  
Integrated Optical ◽  
Out Of Plane ◽  
Dielectric Interfaces ◽  
Surface Electromagnetic Waves ◽  
On Chip ◽  
Optical Circuits ◽  
Plasmon Polaritons

Abstract We propose and theoretically and numerically investigate integrated high-contrast diffraction gratings for surface electromagnetic waves. We consider two platforms for the on-chip gratings: surface plasmon-polaritons propagating along metal-dielectric interfaces and Bloch surface waves propagating along interfaces of photonic crystals. We demonstrate that the optical properties of the studied integrated gratings are qualitatively close to the ones of the conventional high-contrast diffraction gratings. If the “parasitic” out-of-plane scattering is suppressed, the reflectance and transmittance of the on-chip gratings are not only qualitatively, but also quantitatively close to the corresponding values of the conventional “free-space” gratings. The obtained results may find application in novel integrated optical circuits.

IR SPECTROSCOPY WITH SURFACE ELECTROMAGNETIC WAVES

1984 ◽  
Vol 45 (C5) ◽  
pp. C5-167-C5-178
Author(s):  
A. J. Sievers ◽  
Z. Schlesinger ◽  
Y. J. Chabal
Keyword(s):  
Ir Spectroscopy ◽  
Electromagnetic Waves ◽  
Surface Electromagnetic Waves

Evaluation of the accuracy of reconstruction of the electrophysical and geometric parameters of multilayer dielectric coatings by the multi-frequency radio wave method of a slow surface electromagnetic waves

2020 ◽  
pp. 51-58
Author(s):  
Aleksandr I. Kazmin ◽  
Pavel A. Fedjunin
Keyword(s):  
Radio Wave ◽  
Noise Level ◽  
Electromagnetic Waves ◽  
Dielectric Materials ◽  
Geometric Parameters ◽  
Experimental Investigations ◽  
Wave Method ◽  
Dielectric Coatings ◽  
Surface Electromagnetic Waves ◽  
Multilayer Dielectric

One of the most important diagnostic problems multilayer dielectric materials and coatings is the development of methods for quantitative interpretation of the checkout results their electrophysical and geometric parameters. The results of a study of the potential informativeness of the multi-frequency radio wave method of surface electromagnetic waves during reconstruction of the electrophysical and geometric parameters of multilayer dielectric coatings are presented. The simulation model is presented that makes it possible to evaluate of the accuracy of reconstruction of the electrophysical and geometric parameters of multilayer dielectric coatings. The model takes into account the values of the electrophysical and geometric parameters of the coating, the noise level in the measurement data and the measurement bandwidth. The results of simulation and experimental investigations of reconstruction of the structure of relative permittivitties and thicknesses of single-layer and double-layer dielectric coatings with different thicknesses, with different values of the standard deviation (RMS) of the noise level in the measured attenuation coefficients of the surface slow electromagnetic wave are presented. Coatings based on the following materials were investigated: polymethyl methacrylate, F-4D PTFE, RO3010. The accuracy of reconstruction of the electrophysical parameters of the layers decreases with an increase in the number of evaluated parameters and an increase in the noise level. The accuracy of the estimates of the electrophysical parameters of the layers also decreases with a decrease in their relative permittivity and thickness. The results of experimental studies confirm the adequacy of the developed simulation model. The presented model allows for a specific measuring complex that implements the multi-frequency radio wave method of surface electromagnetic waves, to quantify the potential possibilities for the accuracy of reconstruction of the electrophysical and geometric parameters of multilayer dielectric materials and coatings. Experimental investigations and simulation results of a multilayer dielectric coating demonstrated the theoretical capabilities gained relative error permittivity and thickness of the individual layers with relative error not greater than 10 %, with a measurement bandwidth of 1 GHz and RMS of noise level 0,003–0,004.

scholarly journals Reflecting petawatt lasers off relativistic plasma mirrors: a realistic path to the Schwinger limit

2021 ◽  
Vol 9 ◽  
Author(s):  
Fabien Quéré ◽  
Henri Vincenti
Keyword(s):  
Light Intensity ◽  
High Power ◽  
Quantum Electrodynamics ◽  
Laser Light ◽  
Optical Breakdown ◽  
Relativistic Plasma ◽  
Laser Beams ◽  
Relativistic Motion ◽  
Quantum Vacuum ◽  
High Power Lasers

Abstract The quantum vacuum plays a central role in physics. Quantum electrodynamics (QED) predicts that the properties of the fermionic quantum vacuum can be probed by extremely large electromagnetic fields. The typical field amplitudes required correspond to the onset of the ‘optical breakdown’ of this vacuum, expected at light intensities >4.7×1029 W/cm2. Approaching this ‘Schwinger limit’ would enable testing of major but still unverified predictions of QED. Yet, the Schwinger limit is seven orders of magnitude above the present record in light intensity achieved by high-power lasers. To close this considerable gap, a promising paradigm consists of reflecting these laser beams off a mirror in relativistic motion, to induce a Doppler effect that compresses the light pulse in time down to the attosecond range and converts it to shorter wavelengths, which can then be focused much more tightly than the initial laser light. However, this faces a major experimental hurdle: how to generate such relativistic mirrors? In this article, we explain how this challenge could nowadays be tackled by using so-called ‘relativistic plasma mirrors’. We argue that approaching the Schwinger limit in the coming years by applying this scheme to the latest generation of petawatt-class lasers is a challenging but realistic objective.

Propagation of high-power partially coherent fibre laser beams in a real environment

2011 ◽  
Vol 20 (9) ◽  
pp. 094208 ◽  
Author(s):  
Ru-Mao Tao ◽  
Lei Si ◽  
Yan-Xing Ma ◽  
Yong-Chao Zou ◽  
Pu Zhou
Keyword(s):  
High Power ◽  
Laser Beams ◽  
Fibre Laser ◽  
Real Environment ◽  
Partially Coherent
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