Mechanism of quasi-phase-matching in a dual-gas multijet array

Wang, Xiaowei; Chini, Michael; Zhao, Kun; Wu, Yi; Telnov, Dmitry A.; Chu, Shih‐I; Chang, Zenghu

doi:10.1103/physreva.86.021802

Cited by 26 publications

(16 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Ionization and recombination are mutually inverse processes, hence a minimum in the photoionization cross section must have its reflection in the HHG spectra as well. The Cooper minimum in the HHG spectra of Ar has already been observed experimentally many times [33][34][35][36][37]. In our TDDFT calculations, this minimum is clearly seen in the vicinity of the 33rd harmonic (∼ 51 eV).…”

Section: B Hhg Spectrasupporting

confidence: 55%

Exterior complex scaling method in time-dependent density-functional theory: Multiphoton ionization and high-order-harmonic generation of Ar atoms

et al. 2013

Self Cite

View full text Add to dashboard Cite

The exterior complex scaling (ECS) method is applied in the framework of time-dependent density-functional theory (TDDFT) to study multiphoton ionization (MPI) and high-order-harmonic generation (HHG) of multielectron atoms in intense laser fields. ECS allows one to impose correct (outgoing-wave) boundary conditions on the wave functions at large distances. In our implementation, ECS is combined with the time-dependent generalized pseudospectral method for accurate and efficient solution of the time-dependent Kohn-Sham equations. We make use of LB94 exchange-correlation potential which proved accurate in calculations of unperturbed electronic structure of Ar. Calculations of MPI and HHG are performed for the laser pulses with the wavelength of 800 nm and several peak intensities. The HHG spectrum exhibits an intensity-independent minimum corresponding to the photon energy of about 51 eV which is closely related to the Cooper minimum observed in the photoionization cross section of Ar. We found that MPI probabilities and HHG spectra calculated with the frozen-core potential (that is, not including dynamic response of the electron density) differ significantly from those obtained by TDDFT.

show abstract

Section: B Hhg Spectrasupporting

confidence: 55%

Exterior complex scaling method in time-dependent density-functional theory: Multiphoton ionization and high-order-harmonic generation of Ar atoms

et al. 2013

Self Cite

View full text Add to dashboard Cite

show abstract

“…One of the ways to overcome the latter obstacle is a division of extended plasma onto a group of small jets to create a condition for the quasi-phasematching (QPM) between the interacting waves. The concept of the QPM for the HHG in the multi-jet media has previously been demonstrated using the gaseous media [2][3][4], while various peculiarities of this technique have been reported in [5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Laser harmonic enhancement using the quasi-phase-matching in laser plasma

Ganeev

2015

Opt. Spectrosc.

View full text Add to dashboard Cite

The recently developed quasi-phase-matching techniques for the high-order harmonics generating in the multiple plasma jets produced on the surfaces of various targets are reviewed. The achievement of 40× enhancement of the quasi-phase-matched harmonics of 804 nm radiation in the range of 35th harmonic in the cases of metal plasmas is analyzed. We demonstrate various approaches in formation of the multi-jet structures during laser ablation by applying the perforated targets and multi-slit shields.

show abstract

“…The mechanism of the HHG was explained by the three-step model proposed by Corkum [3]. Since then, extensive studies have been done on how to generate a very-high-energy HHG [4][5][6][7] and how to generate an intense HHG through phase-matched generation [8][9][10] or a dual-gas multijet array [11][12][13]. The created attosecond pulse [14][15][16] or pulse train [17,18] can be used as a coherent XUV source to study dynamics in femtosecond [19][20][21] or even attosecond time domains [22,23].…”

Section: Introductionmentioning

confidence: 99%

Anomalous alignment dependence of the third-order harmonic of H2+ions in intense laser fields

2012

View full text Add to dashboard Cite

We studied the high-harmonic generation of H 2 + ions in an intense laser field by solving the time-dependent Schrödinger equation in prolate spheroidal coordinates. By analyzing the power spectra of the harmonics with the electric field polarized along the molecular axis, we found that the yield of the third-order harmonic drops by several orders of magnitude at a specified aligned angle between the laser polarization direction and the molecular axis. The laser polarization angle of the minimum depends on the internuclear distance and it disappears both in the separated-and united-atom limits. This infers that the minimum is associated with the molecular symmetry. By decomposing individual contributions of the σ and π states, we identified that the minimum is attributed to the cancellation of the induced dipole moments of the σ and π states, like a dynamical Cooper minimum, but the position of the minimum can be tuned by the laser intensity for a given internuclear distance.

show abstract

Mechanism of quasi-phase-matching in a dual-gas multijet array

Cited by 26 publications

References 24 publications

Exterior complex scaling method in time-dependent density-functional theory: Multiphoton ionization and high-order-harmonic generation of Ar atoms

Exterior complex scaling method in time-dependent density-functional theory: Multiphoton ionization and high-order-harmonic generation of Ar atoms

Laser harmonic enhancement using the quasi-phase-matching in laser plasma

Anomalous alignment dependence of the third-order harmonic of H2+ions in intense laser fields

Contact Info

Product

Resources

About