Transparency of Magnetized Plasma at Cyclotron Frequency

Abstract

Electromagnetic radiation is strongly absorbed by the magnetized plasma if its frequency equals the cyclotron frequency of plasma electrons. It is demonstrated that absorption can be completely canceled in the presence of a second radiation beam, or even a magnetostatic field of an undulator, resulting in plasma transparency at the cyclotron frequency. This effect is reminiscent of the electromagnetically-induced transparency (EIT) of the three-level atomic systems, except that it occurs in a completely classical plasma. Also, because of the complexity of the classical plasma, index of refraction at cyclotron frequency differs from unity. Potential applications of the EIT in plasma include selective plasma heating, electromagnetic control of the index of refraction, and electron/ion acceleration.

Controllable coupled-resonator-induced transparency in a dual-recycled Michelson interferometer

“…The similar coherence and interference phenomenon, named as EIT-like effect, has been demonstrated in the classical systems such as plasma [14][15][16], mechanical or electric oscillators [17,18], coupled optical resonators [19][20][21][22][23][24], optical parametric oscillators [25][26][27], optomechanical systems [28][29][30] and even some metamaterial configurations [31][32][33]. Especially, the analog of EIT in coupled optical resonators, also called coupled-resonatorinduced transparency, has made great progress in experiment, which has been reported in the different optical systems, such as compound glass waveguide platform using relatively large resonators [34], fiber ring resonators [35], coupled fused-silica microspheres [36,37], integrated micron-size silicon optical resonator systems [38][39][40][41], photonic crystal cavities [42] and graphene-ring resonators [43].…”

Mode growth and competition in the x-ray free-electron laser oscillator start-up from noise

“…1]. Previously, the FEL oscillator start-up from noise has been analyzed in some detail by [16,17], while less complicated analytic expressions for the initial value problem were derived in Ref. [18] for an ideal (no energy spread, constant in time) electron beam in a Fabry-Perottype resonator.…”

Magnetically Induced Transparency and Its Application as an Accelerator

“…A critical aspect of induced transparency in plasma is that the electron perpendicular motion due to the probe electric field is canceled by the response to the upper sideband (which is at the probe frequency). Details of mathematical expansion can be found elsewhere [2,3], where it is shown that phase of the sideband field is automatically matched to cancel the probe field.…”

“…A discussion of the polarization of the electron motion can be found in Ref. [3]. The eikonal term was approximated as e ik 1…”

“…Recently it was theoretically found that a magnetized plasma can be made transparent to a right-hand polarized wave (probe) at the cyclotron frequency in the presence of strong pump wave which is detuned by the plasma frequency [1][2][3]. This is a classical analogy of the quantum electromagnetically induced transparency (EIT) [4,5].…”