Boosting terahertz generation in laser-field ionized gases using a sawtooth wave shape
arXiv:1412.4995 · doi:10.1103/PhysRevLett.114.183901
Abstract
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 reach the highest velocity at the electric field extrema. This allows to increase the THz conversion efficiency to the percent level, an unprecedented performance for THz generation in gases. Besides 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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- Coherent buildup of high harmonic radiation: the classical perspective
- Intensity-surged and Bandwidth-extended Terahertz Radiation in Two-foci Cascading Plasmas
- Weak stochastic ratchets and dynamic localization in measurement-induced quantum trajectories
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- Variational formulation of classical and quantum models for intense laser pulse propagation
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