High-order harmonic generation by chirped and self-guided femtosecond laser pulses. II. Time-frequency analysis

Toşa, V.; Kim, H. T.; Kim, I. J.; Nam, Chang Hee

doi:10.1103/physreva.71.063808

Cited by 55 publications

(19 citation statements)

References 23 publications

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“…We calibrated the artificially induced chirp by analyzing the phase and pulse duration of the laser pulses propagating through the compressor stage at different distances between gratings by using the SPIDER [18] and measuring the pulse duration of various positively and negatively chirped pulses. At these conditions, no new frequencies are introduced, but the "ionization gating" changes the effective drive laser wavelength in the medium through chirping [19][20][21].…”

Section: Experimental Studiesmentioning

confidence: 99%

Experimental and theoretical studies of two-color-pump resonance-induced enhancement of odd and even harmonics from a tin plasma

et al. 2012

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We study high-order harmonic generation from a laser-produced tin plasma using 780 and 390 nm, 40 fs, 1 kHz pulses. Varying the chirp of the laser radiation, we observe variation of the harmonic frequency and intensity. The enhanced 16th and 17th harmonics are attributed to the influence of the strong ionic transitions of tin. Theoretical calculations of the photoabsorption spectra reveal the decisive role of Sn II and Sn III transitions in the enhancement of single harmonics. Varying the fundamental frequency we study numerically the spectral width where the harmonic is enhanced. We find, both theoretically and experimentally, that this width is wider than the one of the corresponding resonance in the photoabsorption spectrum. The resonance line modification can be explained by the Stark shift of the autoionizing state in the laser field, as well as the photoionization of this state.

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Section: Experimental Studiesmentioning

confidence: 99%

Experimental and theoretical studies of two-color-pump resonance-induced enhancement of odd and even harmonics from a tin plasma

et al. 2012

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“…The macroscopic harmonic signal is the result of the coherent superposition of the single dipole emissions in each spatial point. Since the model has been described in several papers [25][26][27], we only mention here some specific aspects connected to the driving pulse propagation in the waveguide.…”

Section: Resultsmentioning

confidence: 99%

High-order harmonic generation in a microfluidic glass device

et al. 2020

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We report on the efficient generation of high-order harmonics in helium gas inside complex glass micro-devices fabricated by femtosecond laser micromachining. By exploiting the three-dimensional capabilities and extreme flexibility of this fabrication technique we developed fluidic micro-structures in a fused-silica substrate that allowed us to achieve accurate control of the gas density inside a micrometer-sized microchannel. As a result, we achieved a broadband spectrum of extreme ultraviolet (XUV) radiation which extends up to 200 eV and we observed a considerable increase in the harmonics generation efficiency if compared with traditional harmonic generation in gas jets. We foresee that the application of femosecond-laser-micromachined glass devices to high-order harmonics generation can be extended to more complex on-chip systems including different functionalities, thus opening the possibility to future miniaturization of XUV and Attosecond beamlines.

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“…[6][7][8] However, all these studies are addressed to the conditions when laser broadening is induced by relatively "mild" influence of the SPM on the harmonic properties. This term refers to the conditions, when both spectral and spatial parameters of laser radiation moderately change during propagation through the nonlinear medium.…”

mentioning

confidence: 99%

Extremely broadened high-order harmonics generated by the femtosecond pulses propagating through the filaments in air

Ganeev

Kuroda

2009

Applied Physics Letters

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We demonstrate a considerable broadening of the harmonics generating in laser plasma using the laser pulses propagating through the filaments in air. A fourfold increase of harmonic bandwidth was achieved in the case of phase-modulated laser pulses, alongside with an increase in harmonic conversion efficiency (from 5×10−6 to 1.2×10−5). We also present the studies of harmonic generation using phase-modulated pulses at different ranges of ellipticity of the polarization of laser beam.

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High-order harmonic generation by chirped and self-guided femtosecond laser pulses. II. Time-frequency analysis

Cited by 55 publications

References 23 publications

Experimental and theoretical studies of two-color-pump resonance-induced enhancement of odd and even harmonics from a tin plasma

Experimental and theoretical studies of two-color-pump resonance-induced enhancement of odd and even harmonics from a tin plasma

High-order harmonic generation in a microfluidic glass device

Extremely broadened high-order harmonics generated by the femtosecond pulses propagating through the filaments in air

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