Interference effects in the formation of the light bullet spectrum under axicon focusingстатья
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Дата последнего поиска статьи во внешних источниках: 8 сентября 2020 г.
Аннотация:Specific features of the anti-Stokes band of the light bulletsupercontinuum spectrum under filamentation of 1900-nm femtosecondpulses, focused by an axicon in fused silica and calciumfluoride, have been experimentally, numerically, and analyticallyinvestigated. It is found that the formation of two or more light bulletsin a filament leads to modulation of spectral components’ intensity.The oscillation period of spectral components, defined as thewavelength interval between adjacent intensity minima, decreaseswith decreasing their wavelength. On a logarithmic scale, the relativechange in the oscillation period in the spectrum is proportionalto the spectral component wavelength and is independent of thepulse energy and the position of the light bullet formation region inthe filament. It is established that the modulation in the spectrum isdue to the interference of the broadband supercontinuum emitted bylight bullets, an