High-order harmonic generation by atoms in a few-cycle laser pulse: Carrier-envelope phase and many-electron effects

Frolov, M. V.; Manakov, N. L.; Silaev, A. A.; Vvedenskii, N. V.; Starace, Anthony F.

doi:10.1103/physreva.83.021405

Cited by 47 publications

(50 citation statements)

References 28 publications

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“…In this paper, we present an analytic description of the λ dependence of the HHG yield based on an analysis of the (near-) universal properties of the returning EWP [30,31]. Our results confirm the main conclusions concerning the λ scaling of HHG represented in Ref.…”

Section: Introductionsupporting

confidence: 75%

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Scaling laws for high-order-harmonic generation with midinfrared laser pulses

et al. 2015

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We derive an analytic expression for the wavelength scaling of the high-order-harmonic generation (HHG) yield induced by midinfrared driving laser fields. It is based on a quasiclassical description of the returning electron wave packet, which is shown to be largely independent of atomic properties. The accuracy of this analytic expression is confirmed by comparison with results of numerical solutions of the time-dependent Schrödinger equation for wavelengths in the range of 1.4 μm ≤ λ ≤ 4 μm. We verify the wavelength scaling of the HHG yield found numerically for midinfrared laser fields in a recent paper by Le et al. [Phys. Rev. Lett. 113, 033001 (2014)].

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Section: Introductionsupporting

confidence: 75%

“…[30,31]. They are based upon a quantum-mechanical treatment of an exactly solvable model for an electron in both a short-range potential and a strong laser field [33] and form the starting point of the present investigation of the λ scaling for short low-frequency midinfrared pulses.…”

Section: Analytic Low-frequency Results For the Ewp And The Hhg mentioning

confidence: 99%

Scaling laws for high-order-harmonic generation with midinfrared laser pulses

et al. 2015

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“…In HHG, resonances have been explored in experiment [50] and theory [51][52][53][54] recently for atomic targets. But shape resonances are rare for common atomic targets.…”

Section: E Shape Resonance In Hhg Of Aligned Nmentioning

confidence: 99%

Intensity dependence of multiple orbital contributions and shape resonance in high-order harmonic generation of aligned N2molecules

et al. 2012

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We report measurements and theoretical simulations of high-order harmonic generation (HHG) in aligned N 2 molecules using a 1200-nm intense laser field when the generating pulse is perpendicular to the aligning one. With increasing laser intensity, the minimum in the HHG spectra first shifts its position and then disappears. Theoretical simulations including the macroscopic propagation effects in the medium reproduce these observations and the disappearance of the minimum is attributed to the additional contribution of HHG from inner orbitals. We also predict that the well-known shape resonance in the photoionization spectra of N 2 should exist in the HHG spectra. It is most clearly seen when the generating laser is parallel to the aligning one and disappears gradually as the angle between the two lasers increases. No clear evidence of this shape resonance has been reported so far when using lasers with different wavelengths. Further experimentation is needed to draw conclusions.

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“…However, broad Feshbach resonances and shape resonances can be observed since they have widths from fractions to a few eV's. In HHG, resonances have been explored in experiment [21] and theory [20,182,183] (also see Publication [7]) recently for atomic targets. But shape resonances are rare for common atomic targets.…”

Section: Single Homo Orbital Contribution At Low Laser Intensitymentioning

confidence: 99%

Theory of Nonlinear Propagation of High Harmonics Generated in a Gaseous Medium

Jin

2013

Springer Theses

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In this thesis, we establish the theoretical tools to investigate high-order harmonic generation (HHG) by intense infrared lasers in a gaseous medium. The macroscopic propagation of both the fundamental and the harmonic fields is taken into account by solving Maxwell's wave equations, while the single-atom (or single-molecule) response is obtained by quantitative rescattering theory. The initial spatial mode of the fundamental laser is assumed either a Gaussian or a truncated Bessel beam. On the examples of Ar, N 2 and CO 2 , we demonstrate that the available experimental HHG spectra with isotropic and aligned target media can be accurately reproduced theoretically even though the HHG spectra are sensitive to the experimental conditions. We show that the macroscopic HHG can be expressed as a product of a macroscopic wave packet and a photorecombination cross section, where the former depends on laser and experimental conditions while the latter is the property of the target only. The factorization makes it possible to retrieve the single-atom or single-molecule structure information from experimental HHG spectra. As for the multiple molecular orbital contribution in HHG, it causes the disappearance of the minimum in the HHG spectrum of aligned N 2 with the increase of laser intensity, and the position of minimum in HHG spectrum of aligned CO 2 depending on many factors is also attributed to it, which could explain why the minima observed in different laboratories may differ. For an important application of HHG as ultrashort light source, we show that measured continuous harmonic spectrum of Xe due to the reshaping of the fundamental laser field can be used to produce an isolated attosecond pulse by spectral and spatial filtering in the far field. For on-going application of using HHG to ionize aligned molecules, we present the photoelectron angular distribution from aligned N 2 and CO 2 in the laboratory frame, which can be compared directly with future experiments. demonstrate that the available experimental HHG spectra with isotropic and aligned target media can be accurately reproduced theoretically even though the HHG spectra are sensitive to the experimental conditions. We show that the macroscopic HHG can be expressed as a product of a macroscopic wave packet and a photorecombination cross section, where the former depends on laser and experimental conditions while the latter is the property of the target only. The factorization makes it possible to retrieve the single-atom or single-molecule structure information from experimental HHG spectra. As for the multiple molecular orbital contribution in HHG, it causes the disappearance of the minimum in the HHG spectrum of aligned N 2 with the increase of laser intensity, and the position of minimum in HHG spectrum of aligned CO 2 depending on many factors is also attributed to it, which could explain why the minima observed in different laboratories may differ. For an important application of HHG as ultrashort light source, we show that measured continu...

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High-order harmonic generation by atoms in a few-cycle laser pulse: Carrier-envelope phase and many-electron effects

Abstract: Frolov, M. V.; Manakov, N. L.; Silaev, A. A.; Vvedenskii, N. V.; and Starace, Anthony F., "High-order harmonic generation by atoms in a few-cycle laser pulse: Carrier-envelope phase and many-electron effects" (2011). Anthony F. Starace Publications. 181.

Cited by 47 publications

References 28 publications

Scaling laws for high-order-harmonic generation with midinfrared laser pulses

Scaling laws for high-order-harmonic generation with midinfrared laser pulses

Intensity dependence of multiple orbital contributions and shape resonance in high-order harmonic generation of aligned N2molecules

Theory of Nonlinear Propagation of High Harmonics Generated in a Gaseous Medium

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