najoNanosystems: Physics, Chemistry, MathematicsНаносистемы: физика, химия, математика2220-80542305-7971Университет ИТМО10.17586/22208054201785613619najo-637Research ArticlePHYSICSФИЗИКАDetection of the polarization spatial distribution of THz radiation generated by twocolor laser filamentationSmirnovS. V.

Kronverkskiy, 49, St. Petersburg, 197101

smirnov.semen@niuitmo.ruKulyaM. S.

Kronverkskiy, 49, St. Petersburg, 197101

mskulya@corp.ifmo.ruTcypkinA. N.

Kronverkskiy, 49, St. Petersburg, 197101

tsypkinan@mail.ruPutilinS. E.

Kronverkskiy, 49, St. Petersburg, 197101

seputilin@yandex.ruBespalovV. G.

Kronverkskiy, 49, St. Petersburg, 197101

ITMO UniversityRussian Federation20171208202585613619Copyright © Smirnov S.V., Kulya M.S., Tcypkin A.N., Putilin S.E., Bespalov V.G., 20252025Smirnov S.V., Kulya M.S., Tcypkin A.N., Putilin S.E., Bespalov V.G.Smirnov S.V., Kulya M.S., Tcypkin A.N., Putilin S.E., Bespalov V.G.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://nanojournal.ifmo.ru/jour/article/view/637

The spatial distribution of the terahertz radiation polarization is experimentally measured from a femtosecond laser twocolor filament in air. Terahertz radiation generation from twocolor plasma filamentation with a  BBO crystal located behind the lens leads to the spatial inhomogeneity of the polarization distribution. Inhomogeneity of the terahertz field polarization is determined by the polarization of the fundamental harmonic of the pump radiation after passing through the  BBO crystal. A spatial inhomogeneity of the fundamental harmonic polarization is observed owing to the  BBO crystal acting as a phase plate illuminated by a spherical front.

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The authors declare that there are no conflicts of interest present.