Optimal Spatial Separation of High-Order Harmonics from Infrared Driving Lasers with an Annular Beam in the Overdriven Regime

Jin, Cheng; Tang, Xiangyu; Li, Baochang; Wang, Kan; Lin, C. D.

doi:10.1103/physrevapplied.14.014057

Cited by 8 publications

(6 citation statements)

References 61 publications

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“…The simulation of the beam propagation must be modified to include the beam profile shaping nonlinear effects experienced during the interaction of the laser and the gas medium. In a recent theoretical work, Cheng Jin et al investigated HHG in the overdriven regime using an annular beam and indicated that XUV and IR can also separate in the far field [42].…”

Section: Discussionmentioning

confidence: 99%

High-flux 100-kHz attosecond pulse source driven by a high average power annular laser beam

Ye,

Oldal,

Csizmadia

et al. 2021

Preprint

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High-repetition-rate attosecond pulse sources are indispensable tools of time-resolved studies of electron dynamics, such as coincidence spectroscopy and experiments with high demands on statistics or signal-to-noise ratio, especially in case of solid and big molecule samples in chemistry and biology. Although with the high-repetition-rate lasers such attosecond pulses in a pump-probe configuration are possible to achieve, until now only a few such light sources have been demonstrated. Here, by shaping the driving laser to an annular beam, a 100-kHz attosecond pulse train (APT) source is reported with the highest energy so far (51 pJ/shot) on target (269 pJ at generation) among the systems using a laser with an average power in the 100 W regime and a repetition rate higher than 10 kHz. The on-target pulse energy is maximized by reducing the losses from the reflections and filtering of the high harmonics, and an unprecedented 19% transmission rate from the generation point to the target position is achieved. At the same time, the probe beam is also annular, and low loss of this beam is reached by using another holey mirror to combine with the APT. The advantages of using an annular beam to generate attosecond pulses with a high average power laser is demonstrated experimentally and theoretically.

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Section: Discussionmentioning

confidence: 99%

High-flux 100-kHz attosecond pulse source driven by a high average power annular laser beam

Ye,

Oldal,

Csizmadia

et al. 2021

Preprint

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show abstract

“…Also, the almost unchanged transmission percentages (t) and beam profiles in Figure 3 up to a medium pressure of p Ar ~10 mbar suggest that at these pressures with our focused laser intensities, the situation is identical to propagating in vacuum. In a recent theoretical work, Jin et al also investigated HHG in the overdriven regime (high ionization) using an annular beam and indicated that XUV and IR can be separated in the far field [75].…”

Section: Generation Beam (Xuv Arm)mentioning

confidence: 99%

High-Flux 100 kHz Attosecond Pulse Source Driven by a High-Average Power Annular Laser Beam

Oldal

Csizmadia

et al. 2022

Ultrafast Sci

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High-repetition rate attosecond pulse sources are indispensable tools for time-resolved studies of electron dynamics, such as coincidence spectroscopy and experiments with high demands on statistics or signal-to-noise ratio, especially in the case of solid and big molecule samples in chemistry and biology. Although with the high-repetition rate lasers, such attosecond pulses in a pump-probe configuration are possible to achieve, until now, only a few such light sources have been demonstrated. Here, by shaping the driving laser to an annular beam, a 100 kHz attosecond pulse train (APT) is reported with the highest energy so far (51 pJ/shot) on target (269 pJ at generation) among the high-repetition rate systems (>10 kHz) in which the attosecond pulses were temporally characterized. The on-target pulse energy is maximized by reducing the losses from the reflections and filtering of the high harmonics, and an unprecedented 19% transmission rate from the generation point to the target position is achieved. At the same time, the probe beam is also annular and low loss of this beam is reached by using another holey mirror to combine with the APT. The advantages of using an annular beam to generate attosecond pulses with a high-average power laser are demonstrated experimentally and theoretically. The effect of nonlinear propagation in the generation medium on the annular-beam generation concept is also analyzed in detail.

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“…As a result, both the harmonic yield and cutoff energy descend rapidly along the propagation axis. Meanwhile, with the gas pressure increasing, the cutoff photon energy will gradually decrease, despite the fact that the harmonic yield in the plateau is enhanced [17]. In addition, the effect of the dispersion and resorption becomes greater under the high pressure.…”

Section: Introductionmentioning

confidence: 98%

Efficient soft x-ray high-order harmonic generation via dual-pulse driving lasers in the overdriven regime

Shao¹,

Zhai²,

Zhang³

et al. 2021

J. Phys. B: At. Mol. Opt. Phys.

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We theoretically investigate the high-order harmonic generation (HHG) driven by dual-pulse lasers. The first pulse of 800 nm can create plasma in the high-density gas target. Then, the second pulse of 1800 nm is spatiotemporally reshaped by the plasma and generates soft x-ray high-order harmonics in the overdriven regime. The simulation results show that adding the first pulse can promote the phase matching of HHG in the cutoff region. As a result, a cutoff-extended HHG is achieved, which is one order of magnitude more intense than that in one pulse scheme reported previously. In dual-pulse driving lasers, the harmonic yield and the cutoff photon energy can be optimized effectively by increasing the gas pressure inside the water window region.

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Optimal Spatial Separation of High-Order Harmonics from Infrared Driving Lasers with an Annular Beam in the Overdriven Regime

Cited by 8 publications

References 61 publications

High-flux 100-kHz attosecond pulse source driven by a high average power annular laser beam

High-flux 100-kHz attosecond pulse source driven by a high average power annular laser beam

High-Flux 100 kHz Attosecond Pulse Source Driven by a High-Average Power Annular Laser Beam

Efficient soft x-ray high-order harmonic generation via dual-pulse driving lasers in the overdriven regime

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