Conical versus Gaussian terahertz emission from two-color laser-induced air plasma filaments
| Autor: | Christian Buhl Sørensen, Sørensen, Christian Buhl, Guiramand, Léo, Degert, Jérôme, Tondusson, Marc, Skovsen, Esben, Freysz, Eric, Abraham, Emmanuel |
|---|---|
| Přispěvatelé: | Department of Materials and Production [Aalborg], Aalborg University [Denmark] (AAU), Laboratoire Ondes et Matière d'Aquitaine (LOMA), Université de Bordeaux (UB)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Silicon Terahertz radiation chemistry.chemical_element Physics::Optics 02 engineering and technology Laser pumping OCIS codes: (110.6795) Terahertz imaging 01 natural sciences (350.5400) Plasmas law.invention 010309 optics terahertz Condensed Matter::Materials Science Optics law 0103 physical sciences (140.3295) Laser beam characterization. 2 [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics] business.industry Second-harmonic generation (300.6495) Spectroscopy Conical surface 021001 nanoscience & nanotechnology Laser Atomic and Molecular Physics and Optics chemistry [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic Golay cell 0210 nano-technology business Beam (structure) |
| Zdroj: | Optics Letters Optics Letters, Optical Society of America-OSA Publishing, 2020, 45 (7), pp.2132. ⟨10.1364/OL.390112⟩ Sørensen, C B, Guiramand, L, Degert, J, Tondusson, M, Skovsen, E, Freysz, E & Emmanuel, A 2020, ' Conical versus Gaussian terahertz emission from two-color laser-induced air plasma filaments ', Optics Letters, vol. 45, no. 7, pp. 2132-2135 . https://doi.org/10.1364/OL.390112 BASE-Bielefeld Academic Search Engine |
| ISSN: | 0146-9592 1539-4794 |
| DOI: | 10.1364/OL.390112⟩ |
| Popis: | In this Letter, we demonstrate that the far-field terahertz (THz) beam generated from a Ti:Sapphire two-color laser-induced filament can exhibit a conical or Gaussian distribution, depending on the filtering experimental conditions. Using both an incoherent Golay cell detector and a two-dimensional coherent electro-optic detection covering the 0.2–2.6 THz spectral range, in our experimental conditions, we provide evidence that the conical emission is due to photo-induced carriers in the silicon filter, typically used to block the remaining pump laser light. Moreover, the low-frequency THz beam retrieves an almost T E M 00 Gaussian spatial distribution when the silicon filter is preceded by a large bandgap ceramic filter, which stops the pump beam, thus preventing the carrier generation in the silicon filter. |
| Databáze: | OpenAIRE |
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