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THz field engineering in two-color femtosecond filaments using chirped and delayed laser pulses

التفاصيل البيبلوغرافية
العنوان: THz field engineering in two-color femtosecond filaments using chirped and delayed laser pulses
المؤلفون: A Nguyen, P González de Alaiza Martínez, I Thiele, S Skupin, L Bergé
المصدر: New Journal of Physics, Vol 20, Iss 3, p 033026 (2018)
بيانات النشر: IOP Publishing, 2018.
سنة النشر: 2018
المجموعة: LCC:Science
LCC:Physics
مصطلحات موضوعية: terahertz generation, chirp, plasma, filamentation, wave propagation, 42.65.Re, Science, Physics, QC1-999
الوصف: We numerically study the influence of chirping and delaying several ionizing two-color light pulses in order to engineer terahertz (THz) wave generation in air. By means of comprehensive 3D simulations, it is shown that two chirped pulses can increase the THz yield when they are separated by a suitable time delay for the same laser energy in focused propagation geometry. To interpret these results, the local current theory is revisited and we propose an easy, accessible all-optical criterion that predicts the laser-to-THz conversion efficiencies given any input laser spectrum. In the filamentation regime, numerical simulations display evidence that a chirped pulse is able to produce more THz radiation due to propagation effects, which maintain the two colors of the laser field more efficiently coupled over long distances. A large delay between two pulses promotes multi-peaked THz spectra as well as conversion efficiencies above 10 ^−4 .
نوع الوثيقة: article
وصف الملف: electronic resource
اللغة: English
تدمد: 1367-2630
العلاقة: https://doaj.org/toc/1367-2630Test
DOI: 10.1088/1367-2630/aaa470
الوصول الحر: https://doaj.org/article/bf176ae1bb4a481eb2d27385a41bc41dTest
رقم الانضمام: edsdoj.bf176ae1bb4a481eb2d27385a41bc41d
قاعدة البيانات: Directory of Open Access Journals
الوصف
تدمد:13672630
DOI:10.1088/1367-2630/aaa470