Annular beam driven high harmonic generation for high flux coherent XUV and soft X-ray radiation

Klas, Robert; Kirsche, Alexander; Tschernajew, Maxim; Rothhardt, Jan; Limpert, Jens

doi:10.1364/oe.26.019318

Cited by 25 publications

(22 citation statements)

References 32 publications

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“…In addition, the increased cutoff allows for > 1 mW of average power above 30 eV. Note, that for a high flux delivery, a gracing incidence plate [35] or annular beam driven HHG [36] in combination with a 100 nm aluminium filter could be used as a separator, resulting in an attenuation of the driving laser to < 1 μW with > 5 mW usable XUV average power on target. The Fourier-limited pulse duration of a single harmonic line corresponds to 3.4 fs pulse duration in the XUV (Fig.…”

Section: High Harmonic Generation Resultsmentioning

confidence: 99%

Ultra-short-pulse high-average-power megahertz-repetition-rate coherent extreme-ultraviolet light source

et al. 2021

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High harmonic generation (HHG) enables coherent extreme-ultraviolet (XUV) radiation with ultra-short pulse duration in a table-top setup. This has already enabled a plethora of applications. Nearly all of these applications would benefit from a high photon flux to increase the signal-to-noise ratio and decrease measurement times. In addition, shortest pulses are desired to investigate fastest dynamics in fields as diverse as physics, biology, chemistry and material sciences. In this work, the up-to-date most powerful table-top XUV source with 12.9 ± 3.9 mW in a single harmonic line at 26.5 eV is demonstrated via HHG of a frequency-doubled and post-compressed fibre laser. At the same time the spectrum supports a Fourier-limited pulse duration of sub-6 fs in the XUV, which allows accessing ultrafast dynamics with an order of magnitude higher photon flux than previously demonstrated. This concept will greatly advance and facilitate applications of XUV radiation in science and technology and enable photon-hungry ultrafast studies.

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Section: High Harmonic Generation Resultsmentioning

confidence: 99%

Ultra-short-pulse high-average-power megahertz-repetition-rate coherent extreme-ultraviolet light source

et al. 2021

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“…This process can take place in every half cycle of the laser field, if the electric field is strong enough to free the electron. Nowadays, HHG is usually driven by state-of-the-art laser systems [6] in order to reach a higher flux of the emitted photons [7], a broader photon energy range of the generated harmonics [8], or to obtain an unprecedented time resolution of a few tens of attoseconds [9]; achievements which have already enabled numerous applications [10,11]. These characteristics are strongly influenced by the driving electric field, because strong-field electron dynamics is intricately linked with the time evolution of the driving laser.…”

Section: Introductionmentioning

confidence: 99%

Generation of high-order harmonics with tunable photon energy and spectral width using double pulses

Oldal

Csizmadia

et al. 2020

Phys. Rev. A

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This work theoretically investigates high-order harmonic generation in rare-gas atoms driven by two temporally delayed ultrashort laser pulses. Apart from their temporal delay, the two pulses are identical. Using a single-atom model of the laser-matter interaction it is shown that the photon energy of the generated harmonics is controllable within the range of one eV-a bandwidth comparable to the photon energy of the fundamental field-by varying the time delay between the generating laser pulses. It is also demonstrated that high-order harmonics generated by double pulses have advantageous characteristics, which mimick certain properties of an extreme ultraviolet monochromator. With the proposed method, a simpler setup at a much lower cost and comparatively higher spectral yield can be implemented in contrast to other approaches.

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“…However, with the increase of laser power, this portion will become stronger and it must be considered. In the high-repetition rate regime of ~100 kHz, several laboratories have used annular laser beams to generate high-order harmonics [27,70], while the measurement of the attosecond temporal duration was only reported in our previous work at ELI-ALPS [52].…”

Section: Generation Beam (Xuv Arm)mentioning

confidence: 99%

“…We make this distinction because temporal characterization is a demonstration of the attosecond pump-probe capability. As shown in Figure 1, single-pass HHG can provide high harmonics [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36] up to tens of nJ per shot at 1 MHz by using powerful driving lasers with an average power up to ~100 W [37][38][39][40][41][42][43] and the attosecond pulses [44][45][46][47][48][49][50][51][52][53][54][55] up to hundreds of pJ per shot at 100 kHz. Intracavity HHG can deliver the high harmonics with the repetition rates up to hundreds of MHz [56][57][58][59][60][61][62][63].…”

Section: Introductionmentioning

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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Annular beam driven high harmonic generation for high flux coherent XUV and soft X-ray radiation

Cited by 25 publications

References 32 publications

Ultra-short-pulse high-average-power megahertz-repetition-rate coherent extreme-ultraviolet light source

Ultra-short-pulse high-average-power megahertz-repetition-rate coherent extreme-ultraviolet light source

Generation of high-order harmonics with tunable photon energy and spectral width using double pulses

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

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