Topic
High harmonic generation
About: High harmonic generation is a research topic. Over the lifetime, 11694 publications have been published within this topic receiving 222650 citations. The topic is also known as: HHG.
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TL;DR: In this paper, a review of the experimental findings and the microscopic theory used for the consistent quantitative analysis of the observations is presented, along with a detailed discussion of the properties of semiconductors with short, off-resonant, high-power terahertz pulses.
Abstract: The excitation of semiconductors with short, off-resonant, high-power terahertz pulses yields extremely nonlinear, ultrafast, dynamical processes including very-high harmonic generation, the occurence of high-order sidebands, dynamical Bloch oscillations, as well as quasi-particle collisions. This review overviews the experimental findings and the microscopic theory used for the consistent quantitative analysis of the observations.
55 citations
TL;DR: In this paper, the second harmonic images taken at 30° from the propagation axis show that the radiation is generated over a length of a few times the Rayleigh length and that the origin of the second-harmonic light is due to the radial electron density gradients created by the ionization process and the radial ponderomotive force.
Abstract: High conversion efficiency (0.1%) into second harmonic light generated in the interaction of a short-pulse intense laser with underdense plasma has been observed. In this experiment the plasma is created by optical field ionization of hydrogen or helium gas. Second harmonic spectra observed in the forward direction show Stokes and anti-Stokes satellites. This is due to the interaction of the second harmonic light with large-amplitude relativistic plasmawaves. Second harmonic images taken at 30° from the propagation axis show that the radiation is generated over a length of a few times the Rayleigh length and that the origin of the second harmonic light is due to the radial electron density gradients created by the ionization process and the radial ponderomotive force.
55 citations
TL;DR: It is demonstrated the intensity enhancement of a single high-order harmonic at a wavelength of 37.67 nm using the lowly ionized antimony laser-ablation plume to cause the multiphoton resonance with the strong radiative transition of the Sb II ions.
Abstract: We demonstrated the intensity enhancement of a single high-order harmonic at a wavelength of 37.67 nm using the lowly ionized antimony laser-ablation plume. The conversion efficiency of this harmonic was 2.5×10-5 and the output energy was 0.3 μJ. Such an enhancement of single-harmonic was caused by the multiphoton resonance with the strong radiative transition of the Sb II ions. The cutoff energy of the harmonics generated in Sb plasma was 86 eV (55th harmonic).
55 citations
TL;DR: The third-order optical nonlinearity of a biradical molecule with open-shell π-electron system, 1,4-bis- (4,5-diphenylimidazole-2-ylidene)-cyclohexa-2, 5-diene (BDPI-2Y) was investigated by the third-harmonic generation method as mentioned in this paper.
55 citations
TL;DR: In this paper, the authors investigate numerically the recently proposed technique of pulse selfcompression by filamentation in noble gases and show that propagation of a 30 fs infrared pulse containing a few mJ of energy leads to a few-cycle pulse in xenon, krypton, argon, and neon.
Abstract: We investigate numerically the recently proposed technique of pulse self-compression by filamentation in noble gases. We show that propagation of a 30 fs infrared pulse containing a few mJ of energy leads to a few-cycle pulse in xenon, krypton, argon, and neon. We describe the different mechanisms and stages of self-compression in the different gases and show that neon, with the highest ionization potential, allows compression to the shortest durations and highest peak intensities. We discuss the process by which an unavoidable frequency modulation of the self-compressed filament simultaneously allows the generation of isolated attosecond (as) pulses via high-order harmonic generation and limits the conversion efficiency of the as pulses.
55 citations