Terahertz pulse generation by two-color laser fields with circular polarization

Autor: Ihar Babushkin, C. Tailliez, V. Vaičaitis, Stefan Skupin, Luc Bergé, Danas Buožius, A. Stathopulos
Přispěvatelé: Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Modélisation de la matière condensée et des interfaces (MMCI), Institut Lumière Matière [Villeurbanne] (ILM), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Vilnius University [Vilnius], Leibniz Universität Hannover=Leibniz University Hannover, Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon, Leibniz Universität Hannover [Hannover] (LUH)
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Optical pumping
Terahertz radiation
Photocurrents
General Physics and Astronomy
Linearly polarized
Physics::Optics
01 natural sciences
terahertz generation
010305 fluids & plasmas
law.invention
3-D numerical simulation
Destructive interference
Terahertz pulse generation
law
[PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph]
Ultrafast lasers
Physics
[PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics]
[PHYS.PHYS.PHYS-ATOM-PH]Physics [physics]/Physics [physics]/Atomic Physics [physics.atom-ph]
Linear polarization
Polarization (waves)
filamentation
Harmonics
Femtosecond
Circular polarization
polarization control
plasma
ultrashort pulse propagation
Physics - Optics
FOS: Physical sciences
Color
Circularly polarized
Ionization of gases
Optics
0103 physical sciences
ddc:530
010306 general physics
business.industry
Terahertz waves
Two-color laser fields
Circularly polarized lasers
Laser
Physics - Plasma Physics
Plasma Physics (physics.plasm-ph)
Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik
business
Optics (physics.optics)
Zdroj: New Journal of Physics 22 (2020), Nr. 10
New journal of physics, Bristol : IOP Publishing Ltd, 2020, vol. 22, art. no.103038, p. [1-18]
New Journal of Physics
New Journal of Physics, 2020, 22 (10), pp.103038. ⟨10.1088/1367-2630/abb863⟩
New Journal of Physics, Institute of Physics: Open Access Journals, 2020, 22 (10), pp.103038. ⟨10.1088/1367-2630/abb863⟩
New Journal of Physics, Institute of Physics: Open Access Journals, 2020, 22 (10), ⟨10.1088/1367-2630/abb863⟩
ISSN: 1367-2630
DOI: 10.1088/1367-2630/abb863⟩
Popis: We study the influence of the polarization states of femtosecond two-color pulses ionizing gases on the emitted terahertz radiation. A local-current model and plane-wave evaluations justify the previously-reported impact on the THz energy yield and an (almost) linearly-polarized THz field when using circularly-polarized laser harmonics. For such pump pulses, the THz yield is independent on the relative phase between the two colors. When the pump pulses have same helicity, the increase in the THz yield is associated to longer ionization sequences and higher electron transverse momenta acquired in the driving field. Reversely, for two color pulses with opposite helicity, the dramatic loss of THz power comes from destructive interferences driven by the highly symmetric response of the photocurrents lined up on the third harmonic of the fundamental pulse. While our experiments confirm an increased THz yield for circularly polarized pumps of same helicity, surprisingly, the emitted THz radiation is not linearly-polarized. This effect is explained by means of comprehensive 3D numerical simulations highlighting the role of the spatial alignment and non-collinear propagation of the two colors.
27 pages, 13 figures
Databáze: OpenAIRE
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