Nonlinear Dichroism in Back-to-Back Double Ionization of He by an Intense Elliptically Polarized Few-Cycle Extreme Ultraviolet Pulse

Djiokap, J. M. Ngoko; Manakov, N. L.; Meremianin, A. V.; Hu, Suxing; Madsen, Lars Bojer; Starace, Anthony F.

doi:10.1103/physrevlett.113.223002

Cited by 33 publications

(31 citation statements)

References 51 publications

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“…2(a)], the energy distributions [see Fig. 3(a)], and the angular distributions (not shown) from either a TDSE calculation or by using the PT formula (24) are in excellent quantitative agreement. According to our discussion following PT formula (18), for time delays τ equal to or longer than the total pulse duration T , the TDP reduces to the following form:…”

Section: A Two-photon Single Ionization By Two Identical Time-delaymentioning

confidence: 76%

“…To obtain the wave packet (r 1 ,r 2 ,t) solution of the TDSE (1), we use the methods developed previously for either an arbitrarily polarized attosecond single pulse [24] or a pair of pulses [8]. In brief, we adopt the time-dependent closecoupling expansion [25,26] of the wave packet (r 1 ,r 2 ,t) onto the orthonormal basis functions of bipolar spherical harmonics…”

Section: Methodsmentioning

confidence: 99%

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Multistart spiral electron vortices in ionization by circularly polarized UV pulses

et al. 2016

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Multistart spiral vortex patterns are predicted for the electron momentum distributions in the polarization plane following ionization of the helium atom by two time-delayed circularly polarized ultrashort laser pulses. For two ultraviolet (UV) pulses having the same frequency (such that two photons are required for ionization), single-color two-photon interferometry with corotating or counter-rotating time-delayed pulses is found to lead respectively to zero-start or four-start spiral vortex patterns in the ionized electron momentum distributions in the polarization plane. In contrast, two-color one-photon plus two-photon interferometry with time-delayed corotating or counter-rotating UV pulses is found to lead respectively to one-start or three-start spiral vortex patterns. These predicted multistart electron vortex patterns are found to be sensitive to the carrier frequencies, handedness, time delay, and relative phase of the two pulses. Our numerical predictions are obtained by solving the six-dimensional two-electron time-dependent Schrödinger equation (TDSE). They are explained analytically using perturbation theory (PT). Comparison of our TDSE and PT results for single-color two-photon processes probes the role played by the time-delay-dependent ionization cross channels in which one photon is absorbed from each pulse. Control of these cross channels by means of the parameters of the fields and the ionized electron detection geometries is discussed.

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Section: A Two-photon Single Ionization By Two Identical Time-delaymentioning

confidence: 76%

Section: Methodsmentioning

confidence: 99%

Multistart spiral electron vortices in ionization by circularly polarized UV pulses

et al. 2016

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“…This corresponds to a spectral width [6] Δω ≃ 1.44ω=n p ≈ 17 eV, and a FWHM in the intensity of 0.36T, or 1.1 cycles. Such single-cycle attosecond pulses (having linear polarization) have been achieved experimentally [7][8][9], albeit with much lower intensity.…”

mentioning

confidence: 99%

“…We obtain the wave packet ΨðtÞ by solving the six-dimensional two-electron TDSE for the He atom interacting with two circularly polarized attosecond pulses using methods developed previously [6] for a single arbitrarily polarized attosecond pulse. Our method uses the finite-element discrete-variable representation combined with the real-space-product algorithm [10] as well as Wigner rotation transformations at each time step from the laboratory frame to the frame of the instantaneous electric field [11,12].…”

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confidence: 99%

Electron Vortices in Photoionization by Circularly Polarized Attosecond Pulses

et al. 2015

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“…However, there is great interest in developing efficient schemes for production of short, coherent xuv pulses with tunable polarizations . This interest is motivated by the numerous applications of chiral-sensitive (dichroic) light-matter interactions, such as in photoionization circular dichroism investigations of chiral molecules [36][37][38], in x-ray magnetic circular dichroism investigations of magnetic materials [39][40][41][42], and in nonlinear elliptic dichroism investigations of double-photoionization processes [43].…”

Section: Introductionmentioning

confidence: 99%

Kinematical vortices in double photoionization of helium by attosecond pulses

et al. 2017

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Manakov, N. L.; Hu, S. X.; Madsen, L. B.; and Starace, Anthony F., "Kinematical vortices in double photoionization of helium by attosecond pulses" (2017 Two-armed helical vortex structures are predicted in the two-electron momentum distributions produced in double photoionization (DPI) of the He atom by a pair of time-delayed elliptically polarized attosecond pulses with opposite helicities. These predictions are based upon both a first-order perturbation theory analysis and numerical solutions of the two-electron, time-dependent Schrödinger equation in six spatial dimensions. The helical vortex structures originate from Ramsey interference of a pair of ionized two-electron wave packets, each having a total angular momentum of unity, and appear in the sixfold differential DPI probability distribution for any energy partitioning between the two electrons. The vortex structures are exquisitely sensitive to the time delay between the two pulses, their relative phase, their ellipticity, and their handedness; moreover, they occur in a variety of electron detection geometries. However, the vortex structures only occur when the angular separation β = cos −1 (p 1 ·p 2 ) between the electron momenta p 1 and p 2 is held fixed. The vortex structures can also be observed in the fourfold differential DPI probability distribution obtained by averaging the sixfold differential probability over the emission angles of one electron. Such kinematical vortices are a general phenomenon that may occur in any ionization process, initiated by two time-delayed short pulses with opposite ellipticities, for particular detection geometries.

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Nonlinear Dichroism in Back-to-Back Double Ionization of He by an Intense Elliptically Polarized Few-Cycle Extreme Ultraviolet Pulse

Cited by 33 publications

References 51 publications

Multistart spiral electron vortices in ionization by circularly polarized UV pulses

Multistart spiral electron vortices in ionization by circularly polarized UV pulses

Electron Vortices in Photoionization by Circularly Polarized Attosecond Pulses

Kinematical vortices in double photoionization of helium by attosecond pulses

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