Boosting terahertz generation in laser-field ionized gases using a sawtooth wave shape



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González de Alaiza, Pedro and Babushkin, Ihar and Bergé, Luc and Skupin, Stephan and Cabrera Granado, Eduardo and Köhler, Christian and Mörgner, Uwe and Husakou, Anton V. and Herrmann, Jens (2015) Boosting terahertz generation in laser-field ionized gases using a sawtooth wave shape. Physical Review Letters, 114 (18). p. 183901. ISSN 0031-9007

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Broadband ultrashort terahertz (THz) pulses can be produced using plasma generation in a noble gas ionized by femtosecond two-color pulses. Here we demonstrate that, by using multiple-frequency laser pulses, one can obtain a waveform which optimizes the free electron trajectories in such a way that they acquire the largest drift velocity. This allows us to increase the THz conversion efficiency to 2%, an unprecedented performance for THz generation in gases. In addition to the analytical study of THz generation using a local current model, we perform comprehensive 3D simulations accounting for propagation effects which confirm this prediction. Our results show that THz conversion via tunnel ionization can be greatly improved with well-designed multicolor pulses.

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© 2015 American Physical Society

Uncontrolled Keywords:Electrons ; Teraherz waves ; Laser ; Multiple frequency ; Ionization ; Inert gases
Subjects:Medical sciences > Optics > Optoelectronics
Medical sciences > Optics > Physical optics
Medical sciences > Optics > Lasers
ID Code:40970
Deposited On:30 Jan 2017 11:17
Last Modified:30 Jan 2017 11:20

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