Direct compression of 170-fs 50-cycle pulses down to 1.5 cycles with 70% transmission

Jeong, Yonghwan; Piccoli, Riccardo; Férachou, Denis; Cardin, Vincent; Chini, Michael; Hädrich, Steffen; Limpert, Jens; Morandotti, Roberto; Légaré, François; Schmidt, Bruno E.; Razzari, Luca

doi:10.1038/s41598-018-30198-y

Cited by 94 publications

(38 citation statements)

References 31 publications

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“…Gas pressure is another parameter which has an important role in nonlinear propagation in HCFs 7,31 because it affects both linear dispersion and nonlinear coupling. In order to study the possible use of the pressure as a control parameter to locate the collapse at a desired distance, we have performed a pressure scan for a 30 fs Ti:Sa laser pulse with fixed input energy propagating inside a HCF with core radius 150 μ m filled with Ar.…”

Section: Resultsmentioning

confidence: 99%

Influence of the spatial confinement on the self-focusing of ultrashort pulses in hollow-core fibers

Crego

Jarque

Román

2019

Sci Rep

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The collapse of a laser beam propagating inside a hollow-core fiber is investigated by numerically solving different nonlinear propagation models. We have identified that the fiber confinement favors the spatial collapse, especially in case of pulses with the input peak power close to the critical value. We have also observed that when using pulses in the femtosecond range, the temporal dynamics plays an important role, activating the spatial collapse even for pulses with input peak powers below the critical value. The complex self-focusing dynamics observed in the region below the critical power depends on the temporal evolution of the pulse and, also, on the interaction between the different spatial modes of the hollow-core fiber.

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Section: Resultsmentioning

confidence: 99%

Influence of the spatial confinement on the self-focusing of ultrashort pulses in hollow-core fibers

Crego

Jarque

Román

2019

Sci Rep

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“…Efforts to scale the average power have led to a >200 W sub-2-cycle pulse source 17 based on high-repetition-rate (100 kHz) ytterbium-based fiber chirped pulse amplifier technology combined with hollow-core fiber (HCF) nonlinear post-compression 18 . While the achievable compression factors have increased 33-fold 19 , CEP locking has yet to be implemented. On the other hand, progress in high-repetition-rate pump laser technology and passively CEP-stable seed generation 20 for TW-class OPCPAs has recently led to the production of~10 W average power sub-3-cycle pulses with a stable CEP 21 , but their capabilities for high-field applications have yet to be harnessed.…”

Section: Introductionmentioning

confidence: 99%

Relativistic-intensity near-single-cycle light waveforms at kHz repetition rate

et al. 2020

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The development of ultra-intense and ultra-short light sources is currently a subject of intense research driven by the discovery of novel phenomena in the realm of relativistic optics, such as the production of ultrafast energetic particle and radiation beams for applications. It has been a long-standing challenge to unite two hitherto distinct classes of light sources: those achieving relativistic intensity and those with pulse durations approaching a single light cycle. While the former class traditionally involves large-scale amplification chains, the latter class places high demand on the spatiotemporal control of the electromagnetic laser field. Here, we present a light source producing waveformcontrolled 1.5-cycle pulses with a 719 nm central wavelength that can be focused to relativistic intensity at a 1 kHz repetition rate based on nonlinear post-compression in a long hollow-core fiber. The unique capabilities of this source allow us to observe the first experimental indications of light waveform effects in laser wakefield acceleration of relativistic energy electrons.

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“…Moreover, for practical reasons and to ensure a reasonable footprint, the capillary length is often of the order of 1 m. As a consequence, for pulse durations of 300 fs and energies between 100 µJ and 1 mJ, as is standard at the output of YDFA systems, a capillary diameter of 250 µm is often used to obtain a compression ratio around 10. In a laboratory environment where longer capillaries with larger diameters can be used, a recent experiment demonstrates a compression ratio of 33 in a 6-m-long 500-µm-diameter capillary with a transmission of 70% [13].…”

Section: Rationalementioning

confidence: 99%

High-power two-cycle ultrafast source based on hybrid nonlinear compression

Lavenu¹,

Natile²,

Guichard³

et al. 2019

Opt. Express

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We demonstrate a hybrid dual-stage nonlinear compression scheme, which allows the temporal compression of 330 fs-pulses down to 6.8 fs-pulses, with an overall transmission of 61%. This high transmission is obtained by using a first compression stage based on a gasfilled multipass cell, and a second stage based on a large-core gas-filled capillary. The source output is fully characterized in terms of spectral, temporal, spatial, and short-and long-term stability properties. The system's compactness, stability, and high average power makes it ideally suited to drive high photon flux XUV sources through high harmonic generation. IntroductionFew-cycle laser sources are the subject of intense research efforts worldwide since they allow efficient high-harmonic generation (HHG) and the emission of isolated attosecond pulses. This results in compact and highly coherent radiation sources in the extreme ultraviolet (XUV) and soft X-ray ranges, with a rapidly increasing number of scientific and industrial applications such as ultrafast spectroscopy, nanoscale imaging, and attosecond science [1-3]. Laser sources based on titanium-doped sapphire (Ti:Sa) have, for a long time, been almost exclusively used to drive the HHG process and to pioneer attosecond physics. The pulse duration typically available from such lasers is 25 fs, so that a single stage of nonlinear compression in a gas-filled capillary result in few-cycle pulses [4]. Despite extraordinary material properties such as gain bandwidth and thermal conductivity, Ti:Sa systems suffer from the short upper state lifetime, their large quantum defect and the fact that they must be pumped with high brightness green lasers. This limits the efficiency, output average power, and prevents repetition rate scaling to drive strong field physics experiments.Laser physicists have been working on more efficient and power scalable ultrafast sources for strong field physics for over a decade. In particular, optical parametric chirped pulse amplifier systems appear as a particularly promising solution [5,6], since they can deliver extremely short pulses in various wavelength ranges and are less impacted by thermal effects because they are based on a non-resonant nonlinear process. However, in order to obtain good spatial and temporal quality, the energy transfer from the pump to the signal is around 10%, so that the pump laser energy must be scaled accordingly, with stringent requirements in terms of spatial and temporal quality.Currently, the most mature and powerful ultrafast source technology is undoubtedly ytterbium-based systems, with average power levels beyond 1 kW [7-9] and numerous industrial applications. These lasers have been used to drive the HHG process as early as 2009 [10], but the long pulse duration delivered by these sources (300 fs -2 ps) limits their relevance to this application field. Therefore, nonlinear compression setups have been used successfully to reduce the pulse duration and obtain XUV photon flux among the highest ever reported for HHG-based sources [11...

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Direct compression of 170-fs 50-cycle pulses down to 1.5 cycles with 70% transmission

Cited by 94 publications

References 31 publications

Influence of the spatial confinement on the self-focusing of ultrashort pulses in hollow-core fibers

Influence of the spatial confinement on the self-focusing of ultrashort pulses in hollow-core fibers

Relativistic-intensity near-single-cycle light waveforms at kHz repetition rate

High-power two-cycle ultrafast source based on hybrid nonlinear compression

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