Efficient generation of below-threshold harmonics for high-fidelity multi-photon physics in the VUV spectral range

Rompotis, Dimitrios; Gebert, Thomas; Wieland, Marek; Karimi, F; Drescher, Markus

doi:10.1364/ol.40.001675

Cited by 11 publications

(7 citation statements)

References 25 publications

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“…Briefly, 5th harmonic pulses from a 13.5 mJ, 40-fs chirped pulse amplification (CPA) Ti:sapphire laser system with a central wavelength of 800 nm and a repetition rate of 25 Hz are utilized (see Ref. [13] for a detailed description). The high-order harmonic generation setup provides sub-20-fs pulses centered at 161 nm and pulse energies up to 1.1 μJ, measured with a calibrated XUV photodiode.…”

Section: Methodsmentioning

confidence: 99%

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Tracing few-femtosecond photodissociation dynamics on molecular oxygen with a single-color pump-probe scheme in the VUV

et al. 2016

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Molecular wave-packet dynamics in oxygen are studied in the time domain, using a single-color VUVpump-VUV-probe scheme. 17-fs VUV pulses, centered at 161 nm are generated via high-order harmonic generation driven by an intense 800-nm pulse leading to VUV pulse energies that reach 1.1 μJ per pulse. An all-reflective interferometric pump-probe scheme is used for studying the delay dependence of the molecular oxygen ion signal with simultaneous nonresonant photoionization of krypton as a precise timing-reference. Access to the excited dissociative state lifetime is provided by the resulting delay-dependent O 2 + signal, ultimately limited by the molecular ionization window. The ability to use a two-photon VUV probe provides the delay-dependent detection of O + as an additional observable, extending the dissociation observation window.

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Section: Methodsmentioning

confidence: 99%

“…In the present work an intense 5th harmonic source [13] enables sensitive multiphoton pump-probe experiments in the VUV. We report on a VUV-pump-VUV-probe experiment on molecular oxygen with intense and well-characterized sub-20-fs pulses.…”

Section: Introductionmentioning

confidence: 99%

Tracing few-femtosecond photodissociation dynamics on molecular oxygen with a single-color pump-probe scheme in the VUV

et al. 2016

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“…Moreover, the aforementioned approach has already been successfully implemented in a single-shot VUV-pump / VUV-probe scheme for the investigation of ultrafast molecular dynamics [71,72]. Few-fs dissociation dynamics of O 2 and H 2 O/D 2 O have been investigated within the respective ionization windows at 162 nm, utilizing an intense, sub-20 fs, fifthharmonic (162 nm / 7.65 eV) pulse [73]. A single-shot intensity autocorrelation measurement of the fifth-harmonic pulse, obtained with the exact experimental setup, has enabled accurate deconvolution of the respective time-constants, disclosing dynamics beyond the instruments temporal resolution in the sub-10 fs range in both cases.…”

Section: Single-shot Time Resolved Studies In Xuv Spectral Range Withmentioning

confidence: 99%

Time gated ion microscopy of light-atom interactions

Tzallas

Bergues

Rompotis

et al. 2018

J. Opt.

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The development of ultra-short intense laser sources in the visible and extreme ultraviolet (XUV) spectral range led to fascinating studies in laser-matter interactions and attosecond science. In the majority of these studies the system under investigation interacts with a focused laser beam, which ionizes the system. The ionization products are usually measured by devices, which spatiotemporally integrate the ionization signal originating from the entire focal area, discarding in this way valuable information about the ionization dynamics that take place in the interaction volume. Here, we review a recently developed approach in measuring the spatially resolved photoionization yields resulting from the interaction of infrared (IR)/XUV ultra-short laser pulses in gas phase media. We show how this approach enables a) the in-situ focus diagnostic, b) quantitative studies of linear and non-linear ionization processes in the IR/XUV regime, c) single-shot XUV-pump-XUV-probe studies and d) single-shot 2 nd -order XUV autocorrelation measurements. The article has been published in

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“…35-fs pulses with an energy of up to 15 mJ per pulse delivered by a Ti:Sa laser system relying on chirped-pulse amplification with a central wavelength of 800 nm and a repetition rate of 25 Hz were loosely focused into a lengthvariable gas cell to generate high-order harmonic radiation. The generation conditions were optimized for fifth harmonic (161.0-nm, 7.7-eV) pulses with a duration of 16 fs and an energy up to 1.1 µJ [27].…”

Section: A Experimental Methodsmentioning

confidence: 99%

Weak-field few-femtosecond VUV photodissociation dynamics of water isotopologues

et al. 2017

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We present a joint experimental and theoretical study of the VUV-induced dynamics of H 2 O and its deuterated isotopologues in the first excited state (Ã 1 B 1) utilizing a VUV-pump VUV-probe scheme combined with ab initio classical trajectory calculations. 16-fs VUV pulses centered at 161 nm created by fifth-order harmonic generation are employed for single-shot pump-probe measurements. Combined with a precise determination of the VUV pulses' temporal profile, they provide the necessary temporal resolution to elucidate sub-10-fs dissociation dynamics in the 1+1 photon ionization time window. Ionization with a single VUV photon complements established strong-field ionization schemes by disclosing the molecular dynamics under perturbative conditions. Kinetic isotope effects derived from the pump-probe experiment are found to be in agreement with our by ab initio classical trajectory calculations, taking into account photoionization cross sections for the ground and first excited state of the water cation.

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Efficient generation of below-threshold harmonics for high-fidelity multi-photon physics in the VUV spectral range

Cited by 11 publications

References 25 publications

Tracing few-femtosecond photodissociation dynamics on molecular oxygen with a single-color pump-probe scheme in the VUV

Tracing few-femtosecond photodissociation dynamics on molecular oxygen with a single-color pump-probe scheme in the VUV

Time gated ion microscopy of light-atom interactions

Weak-field few-femtosecond VUV photodissociation dynamics of water isotopologues

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