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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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Journal ArticleDOI
TL;DR: In this paper, the authors investigate the high-order harmonic generation (HHG) from solids by simulating the dynamics of a single active electron in periodic potentials, and the corresponding time-dependent Schrodinger equations are solved numerically by using $B$-spline basis sets in coordinate space.
Abstract: We investigate the high-order-harmonic generation (HHG) from solids by simulating the dynamics of a single active electron in periodic potentials. The corresponding time-dependent Schr\"odinger equations (TDSEs) are solved numerically by using $B$-spline basis sets in coordinate space. The energy-band structure and wave vectors can be directly retrieved from the eigenfunctions. The harmonic spectra obtained agree well with the results simulated by TDSE in $k$-space using Bloch states and show a two-plateau structure. Both of the cutoff energies of the two plateaus in the harmonic spectrum scale linearly with the field strength. We also study HHG driven by intense few-cycle laser pulses and find that the cutoff energy of the harmonic spectrum is sensitive to the changes of the carrier envelope phase.

80 citations

Journal ArticleDOI
Kenzo Miyazaki1, M. Kaku, Godai Miyaji, A. Abdurrouf, Farhard Faisal 
TL;DR: High-order harmonic generation is demonstrated to provide a sensitive way for an extensive study of dynamic processes in the field-free alignment of strong-field-induced molecular rotational wave packets.
Abstract: High-order harmonic generation is demonstrated to provide a sensitive way for an extensive study of dynamic processes in the field-free alignment of strong-field-induced molecular rotational wave packets. The time-dependent harmonic signal observed from field-free-aligned N2, O2, and CO2 has been found to include two sets of beat frequency for pairs of coherently populated rotational states. One of them is the well-known frequency component characterizing the field-free alignment of molecules, and the other is ascribed to the beat that arises from coherence embedded in the wave packet. We discuss the effect of each frequency component on the revival signal observed with the harmonic generation.

80 citations

Journal ArticleDOI
TL;DR: In this paper, soft x-ray photons, generated by the interaction of intense 610 nm sub-picosecond laser pulses with rare gases, are used to carry out tunable angle-resolved photoemission on a number of systems.
Abstract: Soft x‐ray photons, generated by the interaction of intense 610 nm subpicosecond laser pulses with rare gases, are used to carry out tunable angle‐resolved photoemission on a number of systems. When the intensity at the focus of the input radiation exceeds ∼1014 W/cm2 significant quantities of harmonic photons at odd multiples of the input 610 nm (2.04 eV) light are produced. To date, harmonics from the 5th (10.2 eV) to the 25th (51 eV) have been generated with fluxes sufficient for generating photoemission spectra. The experimental apparatus for harmonic generation and several experiments demonstrating the applications of this light are described.

80 citations

Journal ArticleDOI
TL;DR: In this article, the third-order polarizabilities were measured in the gas phase using dc electric field induced optical second harmonic generation and were found to be positive in each case.
Abstract: Third‐order polarizabilities are measured in the gas phase using dc electric‐field induced optical second‐ harmonic generation and are found to be positive in each case.

80 citations

Journal ArticleDOI
TL;DR: By spectroscopic analysis of the cantilever oscillation in tapping-mode atomic-force microscopy (TM-AFM), the authors showed that the transition from an oscillatory state dominated by a net attractive force to the state dominated with repulsive interaction is accompanied by the enhanced generation of higher harmonics.
Abstract: By spectroscopic analysis of the cantilever oscillation in tapping-mode atomic-force microscopy (TM–AFM), we demonstrate that the transition from an oscillatory state dominated by a net attractive force to the state dominated by repulsive interaction is accompanied by the enhanced generation of higher harmonics. The higher harmonics are a consequence of the nonlinear interaction and are amplified to significant amplitudes by the eigenmodes of the cantilever. The results show that in a quantitative description of TM–AFM higher eigenmode excitation must be considered to account for internal energy dissipation.

80 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023177
2022438
2021399
2020489
2019516
2018433