Effect of Chirp and External Focusing on the SpectrallyIsolated Raman Component During Filamentation in AirстатьяИсследовательская статья
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Дата последнего поиска статьи во внешних источниках: 15 апреля 2026 г.
Аннотация:Spectrally isolated Raman component produced in filamentation of a near-infrared femtosecond laser pulsein air has been studied experimentally. The effect of laser pulse chirp and geometrical focusing on the Ramancomponent formation are detailed in our study. Qualitative transformation of the frequency-angular spectrawith the chirped laser pulse duration and the chirp sign has been found. The optimum conversion of the laserpulse into the Raman component reaches 25% for the loosely focused (numerical aperture NA = 0.002) andslightly negatively chirped laser pulse.