Bicircular High-Harmonic Spectroscopy Reveals Dynamical Symmetries of Atoms and Molecules

Baykusheva, Denitsa; Ahsan, Sabbir; Lin, Nan; Wörner, Hans Jakob

doi:10.1103/physrevlett.116.123001

Cited by 177 publications

(164 citation statements)

References 60 publications

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“…This circularly polarized light source is very useful for ultrafast spectroscopy, especially for the ultrafast circular dichroism studies [29,[35][36][37]. It was also shown that the bicircular HHG driven by this BCCP laser pulse can be a new method to probe dynamical symmetries of atoms and molecules and their evolution in time [38,39]. These attractive features of HHG in BCCP laser fields are related to the symmetry of the laser field and the corresponding three-step dynamics of the continuum electrons.…”

Section: Introductionmentioning

confidence: 99%

Helicity reversion in high-order-harmonic generation driven by bichromatic counter-rotating circularly polarized laser fields

Zhang

Zhu

et al. 2016

Phys. Rev. A

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We investigate the polarization properties of high harmonics generated with the bichromatic counterrotating circularly polarized (BCCP) laser fields by numerically solving time-dependent Schrödinger equation (TDSE). It is found that, the helicity of the elliptically polarized harmonic emission is reversed at particular harmonic orders. Based on the time-frequency analysis and the classical three-step model, the correspondence between the positions of helicity reversions and the classical trajectories of continuum electrons is established. It is shown that, the electrons ionized at one lobe of laser field can be divided into different groups based on the different lobes they recombine at, and the harmonics generated by adjacent groups have opposite helicities. Our study performs a detailed analysis of high harmonics in terms of electron trajectories and depicts a clear and intuitive physical picture of the HHG process in BCCP laser field.

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Section: Introductionmentioning

confidence: 99%

Helicity reversion in high-order-harmonic generation driven by bichromatic counter-rotating circularly polarized laser fields

Zhang

Zhu

et al. 2016

Phys. Rev. A

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“…Finally, we note that we tested our approach for initial states with nonzero orbital angular momentum (in such cases, the ω-2ω bi-circular scheme results with asymmetric spectra that prefer one circular polarization over the other [21,34,39,44]). We found that our approach does not depend on the initial state's angular momentum, as long as the total valence electronic states angular momentum is zero, which makes sense because within each ionization-recollision-emission process the driving laser is linearly polarized.…”

Section: Numerical Resultsmentioning

confidence: 99%

“…Nonetheless, theoretical [10][11][12][13][14][15][16][17][18][19][20][21][22] and experimental [23][24][25][26][27][28][29][30][31][32][33][34][35] advancements have been accomplished over the years. In particular, circular harmonics were produced using a bi-circular driving laser field [26,27,30,31,34,35].…”

Section: Introductionmentioning

confidence: 99%

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High Harmonics with Controllable Polarization by a Burst of Linearly-Polarized Driver Pulses

et al. 2017

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Abstract:We theoretically explore a scheme for generation of bright circularly and elliptically polarized high-order harmonics by bursts of linearly polarized pulses with a rotating polarization axis. Circularly polarized harmonics are formed if the bursts are comprised of N pulses that uphold an N-fold rotational symmetry, for N > 2. Rotating the polarization axes of the comprising pulses can generate elliptical harmonics with a collectively tunable ellipticity, from circular through elliptic to linear. The method preserves the single-cycle, single-atom and macroscopic physics of 'standard' linearly polarized high harmonic generation, with a high yield and cutoff energy. We investigate the method from a time-domain perspective, as well as a photonic perspective, and formulate the energy and spin-angular momentum conservation laws for this scheme. We find that the case of N = 4 is optimal for this method, resulting with the highest conversion efficiency of elliptical photons. The new features of this source offer new applications to helical ultrafast spectroscopy and ellipsometry.

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“…Second, we use the adiabatic approximation to calculate Coulomb factors for HHG spectra produced by a bicircular laser field with a frequency ratio of 1:2. This second aim is motivated by the growing interest, both experimental [21][22][23] and theoretical [24][25][26][27], in HHG spectra produced by bicircular fields.…”

Section: Introductionmentioning

confidence: 99%

Adiabatic-limit Coulomb factors for photoelectron and high-order-harmonic spectra

et al. 2017

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A momentum-dependent Coulomb factor in the probability for nonlinear ionization of atoms by a strong low-frequency laser field is calculated analytically in the adiabatic approximation. Expressions for this Coulomb factor, valid for an arbitrary laser pulse waveform, are obtained and analyzed in detail for the cases of linear and circular polarizations. The dependence of the Coulomb factor on the photoelectron momentum is shown to be significant in both cases. Using a similar technique, the Coulomb factor for emission of high-order harmonics by an atom in a bichromatic laser field is also calculated. In contrast to the case of a single-frequency field, for bichromatic fields the Coulomb factor depends significantly on the harmonic energy.

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Bicircular High-Harmonic Spectroscopy Reveals Dynamical Symmetries of Atoms and Molecules

Cited by 177 publications

References 60 publications

Helicity reversion in high-order-harmonic generation driven by bichromatic counter-rotating circularly polarized laser fields

Helicity reversion in high-order-harmonic generation driven by bichromatic counter-rotating circularly polarized laser fields

High Harmonics with Controllable Polarization by a Burst of Linearly-Polarized Driver Pulses

Adiabatic-limit Coulomb factors for photoelectron and high-order-harmonic spectra

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