Plasma local diagnostics by polarimetric method

Abstract

We study the polarization plane rotation of weak probe signal in the field of strong electromagnetic waves in the presence of an external magnetic field of plasma, the polarization plane stimulated rotation angle of the probe signal in the intense laser field and in plasma is calculated. The estimates of the residual gas local density in a cesium plasma based on the effects of Faraday, Cotton–Mouton and stimulated rotation of the probe signal in the intense laser field have been found. It is shown, that the rotation angle in the cesium plasma medium has a complex structure.

Stimulated magneto-optics with different detunings for plasma local diagnostics

“…The polarization plane rotations (Faraday and Cotton-Mouton effects) of weak laser in the intense laser and external magnetic fields were found in the case of different resonance detunings of intense and weak laser waves in comparison with the resonant transition frequency of media. In the limit of equal detunings ε ′ = ε our results coincide with those in [14] In the limit when intensity parameter (ξ = 0) usual Faraday effect is obtained; rotation is only in magnetic field. Thus, the nonlinear Faraday and Cotton-Mouton effects in the field of an intense polarized wave make it possible to determine the local value of the magnetic field (for a known atomic density), or local atomic density (for a known magnetic field).…”

“…Nonlinear resonant rotation of the polarization plane is directly related to the rearrangement of atomic energy levels in an intense light field. The rearrangement of atomic levels in constant magnetic and resonant light fields was studied in [13,14].…”

“…In [13,14] the average and local magnetic field and neutral atom density were found in plasma in the case of equal resonance detunings of intense and weak laser waves in comparison with the resonant transition frequency of medium.…”

Polarization control and enhanced magnetic field sensitivity utilizing surface plasmon polaritons-assisted dual-V-type four-level system

“…Magneto-optical materials (e.g. magneto-optical crystal/film /nanoparticles/fiber) can realize the interaction between the magnetic field and optical field by unique magneto-optical effect, including Faraday [5], Kerr [6], Cotton-Mouton [7] and Zeeman effects [8]. As a result, the magnetic field measurement can be achieved by regulating the polarization state of the light field known as magneto-optical rotation (MOR), which has aroused great interest from researchers due to the excellent merits of dichroism, linear and circular birefringence [9][10][11].…”