Experimental observation of quasi-Cerenkov radiation amplification by external fields

Optical Transition Radiation in Presence of Acoustic Waves

“…From the point of view of controlling the parameters of the high-energy electromagnetic processes in a medium, it is of interest to investigate the influence of external fields, such as acoustic waves, temperature gradient etc., on the corresponding characteristics. The considerations of concrete processes, such as diffraction radiation [8], parametric X-radiation [9], channeling radiation [10], electron-positron pair creation by high-energy photons [11], bremsstrahlung of high-energy electrons [12], have shown that the external fields can essentially change the angular-frequency characteristics of the radiation intensities. Recently there has been broad interest in compact crystalline undulators with periodically deformed crystallographic planes as an efficient source of high energy photons [13] (for a review with a more complete list of references see [14]).…”

Spontaneous and induced radiation by electrons/positrons in natural and photonic crystals. Volume free electron lasers (VFELs): From microwave and optical to X-ray range

“…The spectralangular PXR distribution in the presence of a US wave was obtained in [36,37] (for detail see [139]). Experimental observation of the effect of the US wave on parametric radiation was performed in [160,161]. Experimentally observed features of the PXR in the US wave were explained in [162].…”

Optical transition radiation in presence of acoustic waves for an oblique incidence

“…From the point of view of controlling the parameters of various radiation processes in a medium, it is of interest to investigate the influence of external fields, such as acoustic waves, temperature gradient etc., on the corresponding characteristics. The considerations of processes, such as diffraction radiation [7], parametric X-radiation [8], channeling radiation [9], bremsstrahlung of high-energy electrons [10], electron-positron pair creation by high-energy photons [11], have shown that the external fields can remarkably change the spectral and angular characteristics of the radiation intensities. Recently there has been broad interest in compact crystalline undulators with periodically deformed crystallographic planes as an efficient source of high energy photons (for a review see Ref.…”