Real-time pulse length measurement of few-cycle laser pulses using above-threshold ionization

Sayler, A. M.; Rathje, Tim; Müller, Walter; Kürbis, Christian; Rühle, Klaus; Stibenz, Gero; Paulus, G. G.

doi:10.1364/oe.19.004464

Cited by 55 publications

(53 citation statements)

References 28 publications

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“…Calibration of the peak intensity on target was done with an estimated precision of 10% by separate measurements using single ionization of argon atoms in circularly polarized light [22]. The duration and intensity stability of the pulses were monitored on a shot-to-shot basis by a stereo-above-threshold-ionization phase meter [23,24]. More details on our experimental setup can be found in our previous publications [9,25,26].…”

Section: Methodsmentioning

confidence: 99%

Fragmentation of long-lived hydrocarbons after strong field ionization

et al. 2016

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We experimentally and theoretically investigated the deprotonation process on nanosecond to microsecond timescale in ethylene and acetylene molecules, following their double ionization by a strong femtosecond laser field. In our experiments we utilized coincidence detection with the reaction microscope technique, and found that both the lifetime of the long-lived ethylene dication leading to the delayed deprotonation and the relative channel strength of the delayed deprotonation compared to the prompt one have no evident dependence on the laser pulse duration and the laser peak intensity. Quantum chemical simulations suggest that such delayed fragmentation originates from the tunneling of near-dissociation-threshold vibrational states through a dissociation barrier on a dication electronic state along C-H stretching. Such vibrational states can be populated through strong field double ionization induced vibrational excitation on an electronically excited state in the case of ethylene, and through intersystem crossing from electronically excited states to the electronic ground state in the case of acetylene.

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Section: Methodsmentioning

confidence: 99%

Fragmentation of long-lived hydrocarbons after strong field ionization

et al. 2016

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“…Temporal compression of the pulses after the capillary by several bounces from pairs of chirped mirrors and subsequently passing them through a pair of glass wedges for fine-tuning the dispersion results in a pulse duration of ∼ 4.5 fs. The duration and intensity stability of the pulses are monitored on a shot-to-shot basis by a stereo-abovethreshold ionization phase meter [48,49].…”

Section: Methodsmentioning

confidence: 99%

Role of proton dynamics in efficient photoionization of hydrocarbon molecules

et al. 2014

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We experimentally investigate the ionization mechanism behind the formation of remarkably high charge states observed in the laser-pulse-induced fragmentation of different hydrocarbon molecules by Roither et al. [Phys. Rev. Lett. 106, 163001 (2011)], who suggested enhanced ionization occurring at multiple C-H bonds as the underlying ionization mechanism. Using multiparticle coincidence momentum imaging we measure the yield of multiply charged fragmenting ethylene and acetylene molecules at several intensities and pulse durations ranging from the few-cycle regime to 25 fs. We observe, at constant intensity, a strong increase of the proton energy with increasing laser pulse duration. It is shown that this is caused by a strong increase in the yield of highly charged parent molecular ions with pulse duration. Based on experimental evidence we explain this increase by the necessary population of precursor states in the parent ion that feature fast C-H stretch dynamics to the critical internuclear distance, where efficient ionization via enhanced ionization takes place. For increasing pulse duration these precursor ionic states are more efficiently populated, which leads in turn to a higher enhanced-ionization probability for longer pulses. Our work provides experimental evidence for the existence of a multiple-bond version of enhanced ionization in polyatomic molecules.

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“…Recently, it has been reported that the stereo-ATI signal alone is sufficient to estimate both the CEP and the duration of the pulses at the same time with the help of quantitative rescattering theory [53][54][55] or calibration with external SPIDER measurements 56 . However, the method is insensitive to the structures below 30% of the peak intensity.…”

Section: Discussionmentioning

confidence: 99%

Frequency-resolved optical gating capable of carrier-envelope phase determination

2013

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Recent progress of the coherent light synthesis technology has brought the generation of single-cycle pulses within our reach. To exploit the full potential of such a single-cycle pulse in any applications, it is highly important to obtain the full information of its electric field. Here we propose a novel pulse characterization scheme, which enables us to determine not only the intensity and phase profiles of ultrashort pulses but also their absolute carrier-envelope phase values. The method is based on a combination of frequency-resolved optical gating and electro-optic sampling, which can be extended to a self-referencing scheme to determine the electric field evolution of few-cycle ultrashort pulses. We have experimentally demonstrated the technique to characterize sub-single-cycle infrared pulses, and numerically studied the capability of the scheme to incorporate a self-referencing technique and to extend the wavelength range to visible region.

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Real-time pulse length measurement of few-cycle laser pulses using above-threshold ionization

Cited by 55 publications

References 28 publications

Fragmentation of long-lived hydrocarbons after strong field ionization

Fragmentation of long-lived hydrocarbons after strong field ionization

Role of proton dynamics in efficient photoionization of hydrocarbon molecules

Frequency-resolved optical gating capable of carrier-envelope phase determination

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