The Focal Length Effect on Energy Absorption and Terahertz Generation upon Focusing Two-Color Radiation in Airстатья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 10 июля 2019 г.
Аннотация:Generation of terahertz radiation upon filamentation in air of two-color radiation in loose
focusing conditions with focal lengths from 30 to 312 cm and a beam diameter of 0.8 cm was studied.
Two-color radiation was generated in a nonlinear BBO crystal irradiated by a converging laser beam.
Measurements show that the energy input into the medium increases dramatically with a decrease in the
focal length to 50 cm or less; at F = 30 cm, the energy of a terahertz pulse linearly depends on the laser
pulse energy and increases significantly at F = 50 cm. Terahertz radiation is still not observed at longer
focal lengths, which is apparently due to a spatio–temporal mismatch of the radiation of the first and second
harmonics.