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 article, the polarization of a carrier-envelope phase-stabilized short laser pulse is modulated to fine control the electron-wavepacket dynamics, and the signature of a single return of the electron wavepacket over a large range of energies is observed.
Abstract: Attosecond electron wavepackets are produced when an intense laser field ionizes an atom or a molecule1. When the laser field drives the wavepackets back to the parent ion, they interfere with the bound wavefunction, producing coherent subfemtosecond extreme-ultraviolet light bursts. When only a single return is possible2,3, an isolated attosecond pulse is generated. Here we demonstrate that by modulating the polarization of a carrier-envelope phase-stabilized short laser pulse4, we can finely control the electron-wavepacket dynamics. We use high-order harmonic generation to probe these dynamics. Under optimized conditions, we observe the signature of a single return of the electron wavepacket over a large range of energies. This temporally confines the extreme-ultraviolet emission to an isolated attosecond pulse with a broad and tunable bandwidth. Our approach is very general, and extends the bandwidth of attosecond isolated pulses in such a way that pulses of a few attoseconds seem achievable. Similar temporal resolution could also be achieved by directly using the broadband electron wavepacket. This opens up a new regime for time-resolved tomography of atomic or molecular wavefunctions5,6 and ultrafast dynamics.
410 citations
TL;DR: This experiment supports a mechanism for photoinducing an alternating second-order nonlinearity in the fiber by generating second-harmonic light from a single-mode fiber after a few minutes of seeding with 532-nm harmonic light along with 1.064-microm pump light.
Abstract: We generated second-harmonic light from a single-mode fiber after a few minutes of seeding with 532-nm harmonic light along with 1.064-μm pump light. This experiment supports a mechanism for photoinducing an alternating second-order nonlinearity in the fiber.
408 citations
TL;DR: In this paper, the results of an analytical description and of a particle-in-cell simulation of the interaction of an ultrashort, relativistically intense laser pulse, obliquely incident on a nonuniform overdense plasma, are presented and several novel features are identified.
Abstract: The results of an analytical description and of a particle‐in‐cell simulation of the interaction of an ultrashort, relativistically intense laser pulse, obliquely incident on a nonuniform overdense plasma, are presented and several novel features are identified. The absorption and reflection of the ultraintense electromagnetic laser radiation from a sharp‐boundary plasma, high harmonic generation, and the transformation into low‐frequency radiation are discussed. In the case of weak plasma nonuniformity the excitation of nonlinear Langmuir oscillations in the plasma resonance region and the resulting electron acceleration are investigated. The vacuum heating of the electrons and the self‐intersection of the electron trajectories are also studied. In the case of a sharp‐boundary plasma, part of the energy of the laser pulse is found to be converted into a localized, relativistically strong, nonlinear electromagnetic pulse propagating into the plasma. The expansion of the hot electron cloud into the vacuum region and the action of the ponderomotive force of the laser pulse in the localized longitudinal electric field of the Langmuir oscillations lead to ion acceleration. The energy increase of a minority population of multicharged ions is found to be much greater than that of the ambient ions.
403 citations
TL;DR: A review of the recent advances in the field and stresses quantum phenomena that require laser field intensities in excess of the relativistic threshold of ∼ 10 18 W / cm 2 is presented in this article.
394 citations
Book•
29 Oct 2010
TL;DR: Femtosecond Lasers for Optical Clocks and Low Noise Frequency Synthesis are discussed in this paper, as well as their applications in high-order harmonic generation and applications of ultrafast Lasers.
Abstract: Femtosecond Laser Development.- Gigahertz Femtosecond Lasers.- Microstructure Fiber and White-light Generation.- Optical Comb Dynamics and Stabilization.- Femtosecond Noncollinear Parametric Amplification and Carrier-Envelope Phase Control.- Optical Frequency Measurement.- Optical Frequency Measurement Using Frequency Multiplication and Frequency Combs.- Femtosecond Lasers for Optical Clocks and Low Noise Frequency Synthesis.- Generation and Measurement of Intense Phase-Controlled Few-Cycle Laser Pulses.- Quantum Control of High-Order Harmonic Generation.- Applications of Ultrafast Lasers.
393 citations