Attosecond pulse trains with unusual nonlinear polarization

Milošević, D. B.; Becker, W.

doi:10.1103/physreva.62.011403

Cited by 143 publications

(104 citation statements)

References 10 publications

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“…In the case of HHG, the use of a bicircular driving laser field provides a bright (i.e. phase matched) source of circularly polarized EUV [23][24][25][26][27][28][29] and soft X-ray [30] beams with sufficient flux for applications in magnetic spectroscopies of materials [28,30]. In the case of SFI, bicircular fields allow electrons to be driven in 2D trajectories prior to rescattering from the parent ion [31][32][33][34][35][36][37][38].…”

Section: Introductionmentioning

confidence: 99%

Observation of ionization enhancement in two-color circularly polarized laser fields

et al. 2017

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When atoms are irradiated by two-color circularly polarized laser fields the resulting strong field processes are dramatically different than when the same atoms are irradiated by a single-color ultrafast laser. For example, electrons can be driven in complex 2D trajectories before rescattering or circularly polarized high harmonics can be generated, which was once thought impossible. Here, we show that two-color circularly polarized lasers also enable control over the ionization process itself and make a surprising finding: the ionization rate can be enhanced by up to 700% simply by switching the relative helicity of the two-color circularly polarized laser field. This enhancement is experimentally observed in helium, argon and krypton over a wide range of intensity ratios of the twocolor field. We use a combination of advanced quantum and fully classical calculations to explain this ionization enhancement as resulting in part due to the increased density of excited states available for resonance-enhanced ionization in counter-rotating fields compared with co-rotating fields. In the future, this effect could be used to probe the excited state manifold of complex molecules.

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Section: Introductionmentioning

confidence: 99%

Observation of ionization enhancement in two-color circularly polarized laser fields

et al. 2017

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“…Therefore, the laser field peaks three times one cycle of the fundamental, producing three ionization bursts. The electrons ionized to the continuum near the laser peaks can successfully recombine with the parent ion, radiating an attosecond pulse train with three pulses one cycle of the fundamental [7,[23][24][25].…”

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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“…Currently, we employ polarization-shaped bichromatic fields in studies on bichromatic control of ultrafast electron dynamics via M-vs. N-photon interference of states with different parity. Further applications of polarization-shaped bichromatic laser fields include coherent control of HHG as theoretically suggested by [1] along with refined studies of the multiphoton photoelectron circular dichroism of chiral molecules [57] in order to clarify the underlying physical mechanism.…”

Section: Discussionmentioning

confidence: 99%

“…Ultrashort bichromatic laser fields have emerged as a new twist to coherently control ultrafast electron dynamics in atoms [1][2][3][4][5][6], molecules [7][8][9] and solids [10][11][12]. In recent years, (ω : 2ω)-fields have been employed in numerous applications to observe and manipulate the motion of electron wave packets on their intrinsic timescales.…”

Section: Introductionmentioning

confidence: 99%

Ultrashort polarization-tailored bichromatic fields from a CEP-stable white light supercontinuum

et al. 2017

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We apply ultrafast polarization shaping to an ultrabroadband carrier envelope phase (CEP) stable white light supercontinuum to generate polarization-tailored bichromatic laser fields of low-order frequency ratio. The generation of orthogonal linearly and counter-rotating circularly polarized bichromatic fields is achieved by introducing a composite polarizer in the Fourier plane of a 4 f polarization shaper. The resulting Lissajous-and propeller-type polarization profiles are characterized experimentally by cross-correlation trajectories. The scheme provides full control over all bichromatic parameters and allows for individual spectral phase modulation of both colors. Shaper-based CEP control and the generation of tailored bichromatic fields is demonstrated. These bichromatic CEP-stable polarization-shaped ultrashort laser pulses provide a versatile class of waveforms for coherent control experiments.

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Attosecond pulse trains with unusual nonlinear polarization

Cited by 143 publications

References 10 publications

Observation of ionization enhancement in two-color circularly polarized laser fields

Observation of ionization enhancement in two-color circularly polarized laser fields

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

Ultrashort polarization-tailored bichromatic fields from a CEP-stable white light supercontinuum

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