Strong resonance enhancement of a single harmonic generated in the extreme ultraviolet range

Ganeev, R. A.; Suzuki, Masayuki; Baba, M.; Kuroda, Hiroto; Ozaki, T.

doi:10.1364/ol.31.001699

Cited by 197 publications

(131 citation statements)

References 9 publications

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“…This was confirmed in multiple studies following the initial observation of this phenomenon in indium plasma [19]. In particular, strong enhancement of a single harmonic was reported in Cr [20] and Mn [9] plasmas.…”

Section: Isolated Sub-femtosecond Xuv Pulse Generation In Mn Plasmasupporting

confidence: 64%

New Approaches in Frequency Conversion of Laser Radiation in Plasma Plumes

Ganeev¹

2013

OPJ

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Recent studies of plasma harmonic generation are reviewed. We show the advances of this technique for generation of coherent ultrashort pulses in the extreme ultraviolet range. Among the achievements highlighted in this review are the comparative experimental and theoretical studies of high-order harmonic generation in silver plasma, isolated subfemtosecond pulse generation in Mn plasma ablation, stable generation of high-order harmonics of femtosecond laser radiation from laser produced plasma plumes at 1 kHz pulse repetition rate, and high-order harmonic generation in fullerenes using few-and multi-cycle pulses of different wavelengths. We show that new developments of plasma harmonic studies can lead to the creation of an attractive field of laser ablation induced high-order harmonic generation spectroscopy.

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Section: Isolated Sub-femtosecond Xuv Pulse Generation In Mn Plasmasupporting

confidence: 64%

New Approaches in Frequency Conversion of Laser Radiation in Plasma Plumes

Ganeev¹

2013

OPJ

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“…In the present work, red shifts of harmonic generation are described and predicted theoretically by a four-step model in resonant systems, thus confirming that the principle of nonadiabatic red shifts is general at high intensities. Since resonant HHG in laser plasma interaction systems [28,32,33] has been theoretically studied and experimentally reported, we predict that the appearance of a red shift in HHG should be observed experimentally in such media. The principle mechanism for such an effect is the time delay between EE and EI.…”

Section: Discussionmentioning

confidence: 86%

Spectral Shifts of Nonadiabatic High-Order Harmonic Generation

Bian

Bandrauk

2013

Applied Sciences

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High-order harmonic generation (HHG) is a nonlinear nonperturbative process in ultrashort intense laser-matter interaction. It is the main source of coherent attosecond (1 as = 10 −18 s) laser pulses to investigate ultrafast electron dynamics. HHG has become an important table-top source covering a spectral range from infrared to extreme ultraviolet (XUV). One way to extend the cutoff energy of HHG is to increase the intensity of the laser pulses. A consequence of HHG in such intense short laser fields is the characteristic nonadiabatic red and blue shifts of the spectrum, which are reviewed in the present work. An example of this nonperturbative light-matter interaction is presented for the oneelectron nonsymmetric molecular ion HeH 2+ , as molecular systems allow for the study of the laser-molecule orientation dependence of such new effects including a four-step model of MHOHG (Molecular High-order Harmonic Generation).

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“…Recently, this channel was observed experimentally in studies of HHG in argon atoms [9]. In many cases the enhancement is only observed over a narrow band of harmonics [10,11].…”

Section: Introductionmentioning

confidence: 94%

High-order harmonic generation from highly excited states in acetylene

Mulholland

Dundas

2018

Phys. Rev. A

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High-order harmonic generation (HHG) from aligned acetylene molecules interacting with mid infra-red (IR), linearly polarized laser pulses is studied theoretically using a mixed quantum-classical approach in which the electrons are described using time-dependent density functional theory while the ions are treated classically. We find that for molecules aligned perpendicular to the laser polarization axis, HHG arises from the highestoccupied molecular orbital (HOMO) while for molecules aligned along the laser polarization axis, HHG is dominated by the HOMO-1. In the parallel orientation we observe a double plateau with an inner plateau that is produced by ionization from and recombination back to an autoionizing state. Two pieces of evidence support this idea. Firstly, by choosing a suitably tuned vacuum ultraviolet pump pulse that directly excites the autoionizing state we observe a dramatic enhancement of all harmonics in the inner plateau. Secondly, in certain circumstances, the position of the inner plateau cut-off does not agree with the classical three-step model. We show that this discrepancy can be understood in terms of a minimum in the dipole recombination matrix element from the continuum to the autoionizing state. As far as we are aware, this represents the first observation of harmonic enhancement over a wide range of frequencies arising from autoionizing states in molecules.

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Strong resonance enhancement of a single harmonic generated in the extreme ultraviolet range

Cited by 197 publications

References 9 publications

New Approaches in Frequency Conversion of Laser Radiation in Plasma Plumes

New Approaches in Frequency Conversion of Laser Radiation in Plasma Plumes

Spectral Shifts of Nonadiabatic High-Order Harmonic Generation

High-order harmonic generation from highly excited states in acetylene

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