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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62 citations
TL;DR: In this article, a methodology for determining the hosting capacity regarding harmonic distortions is proposed, which includes aggregation effects of harmonic currents, the influence of harmonic distortion limits and harmonic generation profile.
62 citations
TL;DR: In this article, high harmonics generated due to the scattering of relativistic electrons from high intensity laser light is studied in an Nd:glass laser system with a peak intensity of 2×1018 W cm−2 in underdense plasma.
Abstract: High harmonics generated due to the scattering of relativistic electrons from high intensity laser light is studied. The experiments are carried out with an Nd:Glass laser system with a peak intensity of 2×1018 W cm−2 in underdense plasma. It is shown that, at high intensities, when the normalized electric field approaches unity, in addition to the conventional atomic harmonics from bound electrons there is significant contribution to the harmonic spectrum from free electrons. The characteristic signatures of this are found to be the emission of even order harmonics, linear dependence on the electron density, significant amount of harmonics even with circular polarization and a much smaller spatial region over which these harmonics are produced as compared to the atomic case. Imaging of the harmonic beam shows that it is emitted in a narrow cone with a divergence of 2 to 3 degrees.
62 citations
TL;DR: In this paper, a method of generating odd harmonics from an intense laser incident upon a sharp vacuum-overdense plasma interface is presented, which results in efficient odd harmonic generation.
Abstract: A method of generating odd harmonics from an intense laser incident upon a sharp vacuum-overdense plasma interface is presented. One- and two-dimensional simulations are used to investigate the interaction of ultra-intense laser pulses with a sharp vacuum-plasma interface. With an intensity greater than 10/sup 18/ W/cm/sup 2/, these pulses have a pressure greater than 10/sup 3/ Mbar creating large density oscillations and relativistic electron velocities at the surface. This results in efficient odd harmonic generation. The author present is a physical model for this harmonic generation mechanism, along with some scaling of the power in the third harmonic. This is compared with relativistic particle-in-cell simulations that include mobile and immobile ions, as well as a variety of upper shelf densities. A discussion on how ion profile modifications influence the harmonics is also presented. >
62 citations
TL;DR: It is demonstrated that in a short Ar cell, generation of the fifth harmonic from 12 fs pulses at 810 nm directly results in ultrashort vacuum UV pulses at 162 nm, which turned out to be sufficient for use as a pump in time-resolved experiments.
Abstract: We demonstrate that in a short Ar cell, generation of the fifth harmonic from 12 fs pulses at 810 nm directly results in ultrashort vacuum UV pulses at 162 nm. They have a spectral width of ~5 nm and a duration of 11±1 fs (1.4 times the transform limit), as measured by cross correlation with the fundamental pulses. Their energy (estimated to 4 nJ) turned out to be sufficient for use as a pump in time-resolved experiments.
62 citations