Harmonic generation spectroscopy with a two-colour laser field having orthogonal linear polarizations

Sarantseva, T. S.; Frolov, M. V.; Manakov, N. L.; Ivanov, Misha; Starace, Anthony F.

doi:10.1088/0953-4075/46/23/231001

Cited by 22 publications

(15 citation statements)

References 29 publications

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“…Since the HHG yield (1) includes only the cross section σ (E) = σ (E,θ = 0 • ), HHG with a linearly polarized field does not allow the retrieval of the two independent parameters, σ 0 (E) and β(E), which completely describe also the photoionization cross section of an atom in an elliptically polarized field [22][23][24]. Procedures for retrieving σ 0 and β by means of HHG spectroscopy have been derived theoretically [25,26]. However, their requirements for either precise harmonic polarization measurements [25] or stabilization of the relative phase of a two-color field [26] present challenges for experiment.…”

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“…Procedures for retrieving σ 0 and β by means of HHG spectroscopy have been derived theoretically [25,26]. However, their requirements for either precise harmonic polarization measurements [25] or stabilization of the relative phase of a two-color field [26] present challenges for experiment.…”

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“…While the generality of this tool for HHG spectroscopy remains to be established, the accuracy of the results for β obtained here for Ar provide motivation for pursuing the more detailed HHG measurements specified in Refs. [25,26] for retrieving σ 0 and β for arbitrary targets. Provided spin-orbit and fine-structure effects are ignored, the differential cross section (2) for a closed-shell atom such as Ar is exact in LS coupling even though it has the same form as for a central potential atomic model [23].…”

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Atomic photoionization experiment by harmonic-generation spectroscopy

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Measurements of the high-order-harmonic generation yield of the argon (Ar) atom driven by a strong elliptically polarized laser field are shown to completely determine the field-free differential photoionization cross section of Ar, i.e., the energy dependence of both the angle-integrated photoionization cross section and the angular distribution asymmetry parameter. DOI: 10.1103/PhysRevA.93.031403 Advances in laser technologies have enabled measurements of atoms and molecules that provide detailed views of their structures as well as the ability to image ultrafast processes on attosecond (10 −18 s) time scales [1][2][3][4][5][6]. Nevertheless, the most common method for obtaining information on the electronic structure of atoms and molecules remains single-photon ionization (since the photoelectron angular and energy distributions are sensitive to both the initial target wave function and the final-state wave function of the ion and continuum electron [7][8][9]). Photoionization experiments nowadays are typically carried out at synchrotron or free-electron laser light source facilities. An appeal of laser spectroscopy for photoionization measurements is the tabletop size of the experimental setup. However, a main obstacle for laser spectroscopy measurements of energy-resolved photoionization spectra is the need for tunable laser sources. This remains a challenge in the important VUV and XUV photon energy regions. However, this problem can be overcome by high-order-harmonic generation (HHG) spectroscopy [10][11][12][13][14], which permits fully coherent, energyresolved photoionization measurements with a laser field whose frequency is much smaller than the ionization potentials of typical atomic or molecular targets. This connection of the nonlinear harmonic-generation process with the linear photoionization process is one of the key advances in our understanding of strong-field processes.HHG spectroscopy is based on the quasiclassical interpretation of HHG as a three-step process [3,15,16]: (i) tunnel ionization of an electron in an atomic or molecular target by a strong low-frequency laser field; (ii) propagation of the ionized electron in the laser-dressed continuum away from and back to the target ion by the oscillating field; and (iii) recombination of the returning electron back to the target ground state with emission of a harmonic photon. The intensity of the harmonic radiation carries information on the photorecombination cross section (PRCS), which is related (through the principle of detailed balance) to that for photoionization. The retrieval of the PRCS is based on the phenomenological parametrization of the HHG yield Y as the product of an electronic wave packet W (E) and the field-free PRCS σ (E) [17,18],where E is the energy of the recombining electron, E is the harmonic energy, and I p is the target binding energy. The parametrization (1) is valid in the tunneling regime and involves the exact PRCS for an electron having momentum directed along the polarization axis of the linearly polarized ...

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Atomic photoionization experiment by harmonic-generation spectroscopy

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“…[53] and its application to the description of the HHG process for both monochromatic and two-color fields has been presented in Refs. [38,54,55]. Thus we discuss here the general ideas of the TDER model and its application to the HHG process only briefly.…”

Section: A Time-dependent Effective Range Theorymentioning

confidence: 99%

“…A more spectacular application of the two-color scheme with orthogonal linearly polarized components was used to determine ionization and recombination times from an analysis of HHG spectra [5,36,37]. The two-color scheme was also proposed as a tool for HHG-based spectroscopy with the ability to retrieve both the angle-integrated photoionization cross section and the asymmetry parameter [38], which determines the angular distribution of photoelectrons [39].…”

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Control of threshold enhancements in harmonic generation by atoms in a two-color laser field with orthogonal polarizations

et al. 2016

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Frolov, M. V.; Manakov, N. L.; Sarantseva, T. S.; Silaev, A. A.; Vvedenskii, N. V.; and Starace, Anthony F., "Control of threshold enhancements in harmonic generation by atoms in a two-color laser field with orthogonal polarizations" (2016 Threshold phenomena (or channel-closing effects) are analyzed in high-order harmonic generation (HHG) by atoms in a two-color laser field with orthogonal linearly polarized components of a fundamental field and its second harmonic. We show that the threshold behavior of HHG rates for the case of a weak second harmonic component is sensitive to the parity of a closing multiphoton ionization channel and the spatial symmetry of the initial bound state of the target atom, while for the case of comparable intensities of both components, suppression of threshold phenomena is observed as the relative phase between the components of a two-color field varies. A quantum orbit analysis as well as phenomenological considerations in terms of Baz' theory of threshold phenomena [Zh. Eksp. Teor. Fiz. 33, 923 (1957)] are presented in order to describe and explain the major features of threshold phenomena in HHG by a two-color field.

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Photoionization of Atoms

Starace¹

2023

Springer Handbooks

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Harmonic generation spectroscopy with a two-colour laser field having orthogonal linear polarizations

Cited by 22 publications

References 29 publications

Atomic photoionization experiment by harmonic-generation spectroscopy

Atomic photoionization experiment by harmonic-generation spectroscopy

Control of threshold enhancements in harmonic generation by atoms in a two-color laser field with orthogonal polarizations

Photoionization of Atoms

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