Bright single-cycle terahertz source based on gas cells irradiated by two-color laser pulses
| Autor: | Liseykina, T. V., Popruzhenko, S. V. |
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| Rok vydání: | 2019 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1088/1742-6596/1412/4/042005 |
| Popis: | We study the excitation of electron currents in a transparent cell of sub-millimeter size filled by an atomic gas and illuminated by an intense two-color femtosecond laser pulse. The pulse consists of a strong fundamental component and its second harmonic of low intensity, both circularly polarized. We show that for sufficiently small $20\mu$m cells the plasma oscillation excited by asymmetric ionization is almost spatially homogeneous within the interaction volume. This coherent dipole plasma oscillation results in a remarkably efficient conversion of the electron energy into that of radiation emitted in the terahertz frequency domain. Simultaneously, strong quasi-static electric fields of maximal strength $E_m\simeq 10$MV/cm are shown to exist inside the cell during several hundred femtoseconds after the ionizing two-color laser pulse has gone. Comment: 7 pages, 2 figures, 1 table. XXXIst International Conference on Photonic, Electronic, and Atomic Collisions (ICPEAC 2019), Deauville, July 23-30, 2019 |
| Databáze: | arXiv |
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