High-gain harmonic generation with temporally overlapping seed pulses and application to ultrafast spectroscopy

Wituschek, Andreas; Bruder, Lukas; Allaria, E.; Bangert, Ulrich; Binz, Marcel; Callegari, Carlo; Cinquegrana, Paolo; Danailov, M. B.; Demidovich, Alexander; Fraia, Michele Di; Feifel, Raimund; Laarmann, Tim; Michiels, Rupert; Mudrich, M.; Nikolov, Ivaylo; Piseri, P.; Plekan, Oksana; Przystawik, Andreas; Ribič, Primož Rebernic; Sigalotti, Paolo; Stranges, Stefano; Uhl, Daniel; Giannessi, L.; Stienkemeier, F.

doi:10.1364/oe.401249

Cited by 8 publications

(12 citation statements)

References 38 publications

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“…The demonstration of relative-phase control with grazing-incidence optics is expected to push the wavelength limit for coherent-control applications down into the soft X-ray spectral range providing element specificity in the laser-matter interaction. Research and development towards enabling technology in this field open up new windows of opportunities for coherent soft X-ray pulses emitted from seeded free-electron lasers (FEL) and intense table-top high-harmonic generation (HHG) sources [26][27][28].…”

Section: Discussionmentioning

confidence: 99%

Full characterization of a phase-locked DUV double pulse generated in an all-reflective shaping setup working under grazing incidence in a broad spectral range

et al. 2021

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Controlling the temporal and spectral properties of ultrashort laser pulses in the visible and near-infrared spectral range by means of a femtosecond pulse-shaping device is a powerful tool with many applications in ultrafast spectroscopy. A major and successful concept is known as the 4f design, which has a symmetric zero-dispersion-compressor geometry. Most 4f pulse shapers rely on using transmissive optics in their beam path limiting the operational wavelength ranges. In the present contribution, we use an all-reflective shaping setup to generate a phase-locked 266 nm double pulse to benchmark its performance in the limit of short wavelengths. The setup comprises the complete spectral amplitude and phase diagnostics for quantitative analysis of the pulse properties before and after the shaper using the technique of frequency-resolved optical gating. The measured time–frequency spectra are in good agreement with optical simulations. The geometry and hardware of the device including the optical components are designed, such that all harmonics of the deep UV pulses travel the same path, giving the instrument the ability to work with soft X-ray pulses, under vacuum conditions, down to the few-nanometer wavelength scale.

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Section: Discussionmentioning

confidence: 99%

Full characterization of a phase-locked DUV double pulse generated in an all-reflective shaping setup working under grazing incidence in a broad spectral range

et al. 2021

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“…A detailed description of the PM technique and of the experimental setup are given in Refs. [24,28,9,37,38]. Fig.…”

Section: Methodsmentioning

confidence: 99%

Improved stabilization scheme for extreme ultraviolet quantum interference experiments

Uhl,

Wituschek,

Bangert

et al. 2021

Preprint

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Interferometric pump-probe experiments in the extreme ultraviolet (XUV) domain are experimentally very challenging due to the high phase stability required between the XUV pulses. Recently, an efficient phase stabilization scheme was introduced for seeded XUV free electron lasers (FELs) combining shot-to-shot phase modulation with lock-in detection [A. Wituschek et al., Nat Commun 11, 1 (2020)]. This method stabilized the seed laser beampath on the fundamental ultraviolet wavelength to a high degree. Here, we extend this scheme including the stabilization of the XUV beampath, incorporating phase fluctuations from the FEL high gain harmonic generation process. Our analysis reveals a clear signal improvement with the new method compared to the previous stabilization scheme.

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“…As indicated in Figure 2, on both FEL lines a THG light seeding is also implemented. The THG seeding option has proven to be very useful in machine oriented studies [6,7] , as well as in some user experiments, where the higher available pulse energy and/or shorter pulses compensate for the restricted seed wavelength range [8,9] .…”

Section: Ii2 Laser System and Layoutmentioning

confidence: 99%

The seed laser system of the FERMI free-electron laser: design, performance and near future upgrades

Cinquegrana

Demidovich

Kurdi

et al. 2021

High Pow Laser Sci Eng

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An important trend in Extreme UV (EUV) and Soft X-ray FEL development in the last years has been the use of seeding by an external laser, aimed to improve the coherence and stability of the generated pulses. The High Gain Harmonic generation (HGHG) seeding technique was first implemented at FERMI and provided FEL radiation having high coherence as well as intensity and wavelength stability comparable to table-top ultrafast lasers. At FERMI, the seed laser has another very important function: it is the source of external laser pulses used in pump-probe experiments allowing to achieve a record-low timing jitter. This paper describes the design, performance and operational modes of the FERMI seed laser in both single-and double cascade scheme. In addition, the planned upgrade of the system to meet the challenges of the upgrade to Echo Enabled Harmonic Generation mode (EEHG) is presented.

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High-gain harmonic generation with temporally overlapping seed pulses and application to ultrafast spectroscopy

Cited by 8 publications

References 38 publications

Full characterization of a phase-locked DUV double pulse generated in an all-reflective shaping setup working under grazing incidence in a broad spectral range

Full characterization of a phase-locked DUV double pulse generated in an all-reflective shaping setup working under grazing incidence in a broad spectral range

Improved stabilization scheme for extreme ultraviolet quantum interference experiments

The seed laser system of the FERMI free-electron laser: design, performance and near future upgrades

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