A high-repetition rate attosecond light source for time-resolved coincidence spectroscopy

Mikaelsson, Sara; Vogelsang, Jan; Guo, Chen; Sytcevich, Ivan; Viotti, Anne-Lise; Langer, Fabian; Cheng, Yu-Chen; Nandi, Saikat; Jin, Wenjie; Olofsson, Anna; Mauritsson, Johan; L’Huillier, Anne; Gisselbrecht, Mathieu; Arnold, Cord L.

doi:10.1515/9783110710687-011

Cited by 3 publications

(5 citation statements)

References 46 publications

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“…In the literature, the dipole phase is commonly expressed as Φ i = α i (qω)I [49]. The advantage of (13), where α i I now refers only to the first harmonic above the ionization threshold, is that it gives a simple analytical expression for the frequency dependence of the phase. For the short trajectory α s = 0 and for the long trajectory α = −0.16αλ 3 /(m e c 3 ) [53], with α being the fine structure constant.…”

Section: Phase Mismatch In Hhgmentioning

confidence: 99%

“…During many years, amplified femtosecond titanium-sapphire lasers have been the "standard" laser for HHG. Recently, there is an increased diversity of HHG sources driven by a variety of lasers ranging from high energy lasers at low repetition rate, with up to hundreds of mJ energy per pulse [6][7][8][9][10], to high average power lasers, based upon optical parametric amplification or simply high-power oscillators, with pulse energies in the µJ range or below [11][12][13]. Also, high-power, compact, HHG sources based on post-compressed, ytterbium-doped femtosecond lasers [14,15] are becoming increasingly interesting for industrial applications.…”

Section: Introductionmentioning

confidence: 99%

“…Fig.3. ∂Φ i /∂I [see(14)] in (a) Ar, with I = 2.5 × 10 14 Wcm −2 and (b) Ne with I = 5 × 10 14 Wcm −2 for the short (solid) and long (dashed) trajectories, obtained by solving the saddle point equations in the strong field approximation [blue, red] and from the model in(13) [purple, yellow].…”

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confidence: 99%

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Efficient generation of high-order harmonics in gases

Weissenbilder¹,

Carlström²,

Rego³

et al. 2022

Preprint

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High-order harmonic generation (HHG) in gases leads to short-pulse extreme ultraviolet (XUV) radiation useful in a number of applications, for example, attosecond science and nanoscale imaging. However, this process depends on many parameters and there is still no consensus on how to choose the target geometry to optimize the source efficiency. Here, we review the physics of HHG with emphasis on the macroscopic aspects of the nonlinear interaction. We analyze the influence of medium length, pressure, position of the medium and intensity of the driving laser on the HHG conversion efficiency (CE), using both numerical modelling and analytical expressions. We find that efficient high-order harmonic generation can be realized over a large range of pressures and medium lengths, if these follow a certain hyperbolic equation. The spatial and temporal properties of the generated radiation are, however, strongly dependent on the choice of pressure and medium length. Our results explain the large versatility in gas target design for efficient HHG and provide design guidance for future high-flux XUV sources.

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Section: Phase Mismatch In Hhgmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Efficient generation of high-order harmonics in gases

Weissenbilder¹,

Carlström²,

Rego³

et al. 2022

Preprint

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“…Femtosecond light pulses are used for a variety of applications including time-resolved fundamental science, material processing, and medical applications [1]. The present ultrafast laser developments reach for increasing peak and average powers [2] in order to advance applications in these fields, for instance by laser-particle acceleration [3], nonlinear attosecond science [4], and raw-event detection utilized in coincidence spectroscopy [5]. Today's most common high-power ultrafast light sources rely on active Yb-ions.…”

Section: Introductionmentioning

confidence: 99%

Factor 30 Pulse Compression by Hybrid Multipass Multiplate Spectral Broadening

Seidel

Balla

et al. 2022

Ultrafast Sci

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As ultrafast laser technology advances towards ever higher peak and average powers, generating sub-50 fs pulses from laser architectures that exhibit best power-scaling capabilities remains a major challenge. Here, we present a very compact and highly robust method to compress 1.24 ps pulses to 39 fs by means of only a single spectral broadening stage which neither requires vacuum parts nor custom-made optics. Our approach is based on the hybridization of the multiplate continuum and the multipass cell spectral broadening techniques. Their combination leads to significantly higher spectral broadening factors in bulk material than what has been reported from either method alone. Moreover, our approach efficiently suppresses adverse features of single-pass bulk spectral broadening. We use a burst-mode Yb:YAG laser emitting pulses with 80 MW peak power that are enhanced to more than 1 GW after postcompression. With only 0.19% rms pulse-to-pulse energy fluctuations, the technique exhibits excellent stability. Furthermore, we have measured state-of-the-art spectral-spatial homogeneity and good beam quality of M2=1.2 up to a spectral broadening factor of 30. Due to the method’s simplicity, compactness, and scalability, it is highly attractive for turning a picosecond laser into an ultrafast light source that generates pulses of only a few tens of femtoseconds duration.

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“…High-harmonic generation (HHG) from a nonlinear interaction of ultrashort (∼femtosecond) intense infra-red (IR) laser pulses with a low density gaseous medium is a well-established route for the generation of attosecond extreme-ultraviolet (XUV) pulses [1]. Intense research in this field has led to high photon flux, high coherence, good beam quality, and high repetition rate of the source are desirable [10][11][12]. Although various research groups have proposed and also adopted different approaches for these purposes [13][14][15], which include improving phase-matching in the HHG process [13], the use of multi-color laser fields [14], optimizing harmonic generating conditions to select particular electron trajectories to generate low-divergence harmonics [15] etc, there is still scope to improve the source characteristics further.…”

Section: Introductionmentioning

confidence: 99%

The effect of gas-density gradient on high-harmonic generation from neon-filled cells using annular and Gaussian laser beams

Ansari¹,

Kumar²,

Singhal³

et al. 2022

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

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An experimental study was performed to explore the effect of gas-density gradient in laser propagation direction on high-harmonic generation from neon-filled cells using a 50 fs annular and Gaussian Ti:sapphire laser beam. It was observed that, despite 20% lower power, the photon flux of the high-harmonics generated using an annular beam under optimum parameter conditions (∼2.5 × 1010 photons/sec for the 37th order in a 5 mm long cell) is on par with the maximum photon flux generated using a full Gaussian beam (∼2 × 1010 photons/sec for the 37th order in a 15 mm long cell). To elucidate the underlying mechanism for the experimental observation, a numerical simulation of the propagation of both the annular and Gaussian laser beams inside the cell was performed. The simulation was extended to estimate the high-harmonic intensity, after incorporating the effect of laser defocusing, the electron trajectory resolved phase-matching, and gas-density gradient. The dominant role of short electron trajectories was observed in the case of the annular beam, whereas, in the case of the Gaussian beam, a contribution of both short and long trajectories was found. Our analysis shows that, in neon-filled cells, the gas-density gradient present at the laser exit end of the cell plays a dominant role in achieving a high photon flux using an annular laser beam. Further, the annular beam not only provides a higher flux but also has lower divergence and higher coherence. This study will be useful in attosecond pulse metrology as well as in imaging applications viz coherent diffractive imaging.

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A high-repetition rate attosecond light source for time-resolved coincidence spectroscopy

Cited by 3 publications

References 46 publications

Efficient generation of high-order harmonics in gases

Efficient generation of high-order harmonics in gases

Factor 30 Pulse Compression by Hybrid Multipass Multiplate Spectral Broadening

The effect of gas-density gradient on high-harmonic generation from neon-filled cells using annular and Gaussian laser beams

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