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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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BookDOI
01 Jan 2009
TL;DR: In this paper, the authors investigated molecular structure and dynamics by Laser-Driven Electron Recollisions and compared Femtosecond Pulses with Intense Short-Wavelength Fields.
Abstract: High-Intensity Laser Sources.- High-Energy Pulse Compression Techniques.- Ultrafast Laser Amplifier Systems.- Optical Parametric Amplification Techniques.- Carrier-Envelope Phase of Ultrashort Pulses.- Free-Electron Lasers - High-Intensity X-Ray Sources.- Laser-Matter Interaction - Nonrelativistic.- Numerical Methods in Strong Field Physics.- Principles of Single Atom Physics: High-Order Harmonic Generation, Above-Threshold Ionization and Non-Sequential Ionization.- Ionization of Small Molecules by Strong Laser Fields.- Probing Molecular Structure and Dynamics by Laser-Driven Electron Recollisions.- Intense Laser Interaction with Noble Gas Clusters.- Laser-Induced Optical Breakdown in Solids.- Laser-Driven X-ray Sources.- Macroscopic Effects in High-Order Harmonic Generation.- Attosecond Pulses: Generation, Detection, and Applications.- High-Order Harmonics from Plasma Surfaces.- Table-Top X-Ray Lasers in Short Laser Pulse and Discharge Driven Plasmas.- Time-Resolved X-Ray Science: Emergence of X-Ray Beams Using Laser Systems.- Atomic Multi-photon Interaction with Intense Short-Wavelength Fields.- Laser-Matter Interaction - Relativistic.- Relativistic Laser-Plasma Physics.- High-Density Plasma Laser Interaction.- Relativistic Laser-Atom Physics.- Tests of QED with Intense Lasers.- Nuclear Physics with Intense Lasers.- Intense Field Physics with Heavy Ions.- Ion-Generated, Attosecond Pulses: Interaction with Atoms and Comparison to Femtosecond Laser Fields.

71 citations

Journal ArticleDOI
TL;DR: In this article, the authors demonstrate that a Watt-level laser causes a periodic modification of the second-order susceptibility in a silicon nitride waveguide, allowing for quasi-phase matching between the pump and second harmonic modes for arbitrary wavelengths inside the erbium band.
Abstract: Efficient second harmonic generation in integrated platforms is usually achieved by resonant structures, intermodal phase-matching or quasi-phase matching by periodically poling ferroelectric waveguides. However, in all these structures, it is impossible to reconfigure the phase-matching condition in an all-optical way. Here, we demonstrate that a Watt-level laser causes a periodic modification of the second-order susceptibility in a silicon nitride waveguide, allowing for quasi-phase-matching between the pump and second harmonic modes for arbitrary wavelengths inside the erbium band. The grating is long-term inscribed, and leads to a second harmonic generation enhancement of more than 30 dB. We estimate a χ (2) on the order of 0.3 pm/V, with a maximum conversion efficiency of 0.05% W−1. We explain the observed phenomenon with the coherent photogalvanic effect model, which correctly agrees with the retrieved experimental parameters. Phase-matching and quasi-phase-matching in periodically poled ferroelectrics ensure efficient harmonic generation, but only statically. Here, Billat et al. demonstrate all-optically reconfigurable second harmonic generation by inscribing a stable grating in CMOS-compatible nonlinear waveguides.

71 citations

Journal ArticleDOI
TL;DR: In this article, the authors report numerical simulations (using the TDA code) and analytical verification of the generation of 64 A high-power soft X-rays from an exponential regime single-pass seeded FEL.
Abstract: We report numerical simulations (using the TDA code) and analytical verification of the generation of 64 A high-power soft X-rays from an exponential regime single-pass seeded FEL. The seed is generated in the FEL using the High-Gain Harmonic Generation (HGHG) technique combined with the “fresh bunch” technique. A seed pulse at 2944 A is generated by conventional laser techniques. The seed pulse produces an intense energy modulation of the rear part of a 1 GeV, 1245 A electron beam in a “modulator” wiggler. In the “radiator” wiggler (resonant at 64 A), the energy modulation creates beam density modulation followed by radiation of the 46th harmonic of the seed. We use a magnetic delay to position the 64 A radiation at the undisturbed front of the bunch to serve as a seed for a single pass, exponential growth FEL. After a 9 m long exponential section followed by a 7 m long tapered section the radiation power reaches 3.3 GW.

71 citations

Journal ArticleDOI
TL;DR: In this article, the authors demonstrate a comprehensive modification study of silica glass, crystalline silicon, and amorphous silicon film, irradiated by tightly focused cylindrical vector beams with azimuthal and radial polarizations.
Abstract: We demonstrate a comprehensive modification study of silica glass, crystalline silicon, and amorphous silicon film, irradiated by tightly focused cylindrical vector beams with azimuthal and radial polarizations. The evidence of the longitudinal field associated with radial polarization is revealed by second harmonic generation in z-cut lithium niobate crystal. Despite the lower threshold of ring-shaped modification of silicon materials, the modification in the center of single pulse radially polarized beam is not observed. The phenomenon is interpreted in terms of the enhanced reflection of longitudinal component at the interface with high-index contrast, demonstrating that the longitudinal component is inefficient for the flat surface modification. Enhanced interaction of the longitudinal light field with silicon nanopillar structures produced by the first pulse of double-pulse irradiation is also demonstrated.

71 citations

Journal ArticleDOI
TL;DR: A quasi-classical model in the k space combined with the energy band structure of solids is introduced to understand the mechanisms of high-order harmonic generation (HHG) process occurring in a subcycle timescale and provides a scheme to reconstruct the energy dispersion relations in Brillouin zone.
Abstract: We introduce a quasi-classical model in the k space combined with the energy band structure of solids to understand the mechanisms of high-order harmonic generation (HHG) process occurring in a subcycle timescale. This model interprets the multiple plateau structure in HHG spectra well and the linear dependence of cutoff energies on the amplitude of vector potential A0 of the laser fields. It also predicts the emission time of HHG, which agrees well with the results by solving the time-dependent Schrodinger equation (TDSE). It provides a scheme to reconstruct the energy dispersion relations in Brillouin zone and to control the trajectories of HHG by varying the shape of laser pulses. This model is instructive for experimental measurements.

71 citations


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