Femtosecond Optical Laser System with Spatiotemporal Stabilization for Pump-Probe Experiments at SACLA

Togashi, Tadashi; Owada, Shigeki; Kubota, Yuya; Sueda, Keiichi; Katayama, Tetsuo; Tomizawa, H.; Yabuuchi, T.; Tono, Kensuke; Yabashi, Makina

doi:10.3390/app10217934

Cited by 10 publications

(7 citation statements)

References 38 publications

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“…The need for only modest pulse energies results in the most compact, cost-efficient and least intensity-noisy near-infrared FEL pump-probe laser among the previously reported ones. [34][35][36] Only the OPCPA-based laser at LCLS shows comparable long-term pulse energy stability if it is driven with reduced pump power. [34] At full pump power, the LCLS system provides up to 90 W average power after the OPCPA, that is conversion of about 13.5 % of the power provided by the Yb:YAG amplifier.…”

Section: Discussionmentioning

confidence: 99%

Ultrafast MHz‐Rate Burst‐Mode Pump–Probe Laser for the FLASH FEL Facility Based on Nonlinear Compression of ps‐Level Pulses from an Yb‐Amplifier Chain

Seidel

Pressacco

Akcaalan

et al. 2022

Laser & Photonics Reviews

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The Free‐Electron Laser (FEL) FLASH offers the worldwide still unique capability to study ultrafast processes with high‐flux, high‐repetition rate extreme ultraviolet, and soft X‐ray pulses. The vast majority of experiments at FLASH are of pump–probe type. Many of them rely on optical ultrafast lasers. Here, a novel FEL facility laser is reported which combines high average power output from Yb:YAG amplifiers with spectral broadening in a Herriott‐type multipass cell and subsequent pulse compression to sub‐100‐fs durations. Compared to other facility lasers employing optical parametric amplification, the new system comes with significantly improved noise figures, compactness, simplicity, and power efficiency. Like FLASH, the optical laser operates with 10‐Hz burst repetition rate. The bursts consist of 800‐μs long trains of up to 800 ultrashort pulses being synchronized to the FEL with femtosecond precision. In the experimental chamber, pulses with up to 50‐μJ energy, 60‐fs full‐width half‐maximum duration and 1‐MHz rate at 1.03‐μm wavelength are available and can be adjusted by computer‐control. Moreover, nonlinear polarization rotation is implemented to improve laser pulse contrast. First cross‐correlation measurements with the FEL at the plane‐grating monochromator photon beamline are demonstrated, exhibiting the suitability of the laser for user experiments at FLASH.

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Section: Discussionmentioning

confidence: 99%

Ultrafast MHz‐Rate Burst‐Mode Pump–Probe Laser for the FLASH FEL Facility Based on Nonlinear Compression of ps‐Level Pulses from an Yb‐Amplifier Chain

Seidel

Pressacco

Akcaalan

et al. 2022

Laser & Photonics Reviews

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“…The same crystal was used to perform a cross-correlation and find a temporal overlap; the cross-correlation was fitted using the same methods described in . A temporal jitter between the optical and X-ray pulses was monitored using the SACLA timing tool system; however, recent upgrades to the synchronization of the optical laser and XFEL showed that the measured jitter measured was ≈50fs (FWHM) less than the instrument response of the measurement (≈100 fs), indicating that post-processing sorting of the TR-SFX data was unnecessary. The new system also actively corrects for slow timing drift between optical and XFEL beams, which was confirmed by cross-correlation measurements at the start and end of data collection (see SI for more details).…”

Section: Experimental Methodsmentioning

confidence: 99%

Serial Femtosecond Crystallography Reveals that Photoactivation in a Fluorescent Protein Proceeds via the Hula Twist Mechanism

Fadini,

Hutchison,

Morozov

et al. 2023

J. Am. Chem. Soc.

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Chromophore cis/trans photoisomerization is a fundamental process in chemistry and in the activation of many photosensitive proteins. A major task is understanding the effect of the protein environment on the efficiency and direction of this reaction compared to what is observed in the gas and solution phases. In this study, we set out to visualize the hula twist (HT) mechanism in a fluorescent protein, which is hypothesized to be the preferred mechanism in a spatially constrained binding pocket. We use a chlorine substituent to break the twofold symmetry of the embedded phenolic group of the chromophore and unambiguously identify the HT primary photoproduct. Through serial femtosecond crystallography, we then track the photoreaction from femtoseconds to the microsecond regime. We observe signals for the photoisomerization of the chromophore as early as 300 fs, obtaining the first experimental structural evidence of the HT mechanism in a protein on its femtosecond-to-picosecond timescale. We are then able to follow how chromophore isomerization and twisting lead to secondary structure rearrangements of the protein β-barrel across the time window of our measurements.

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“…The 2D detector was a multi-port charge coupled device (MPCCD) having 512 × 1024 pixels 59 . Shot-to-shot variance in the X-FEL pulse arrival time is accounted for using an arrival timing monitor 60 . This jitter correction results in a temporal resolution approaching tens of femtoseconds 60 .…”

Section: Methodsmentioning

confidence: 99%

Determination of sub-ps lattice dynamics in FeRh thin films

Grimes

Ueda

Ozerov

et al. 2022

Sci Rep

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Understanding the ultrashort time scale structural dynamics of the FeRh metamagnetic phase transition is a key element in developing a complete explanation of the mechanism driving the evolution from an antiferromagnetic to ferromagnetic state. Using an X-ray free electron laser we determine, with sub-ps time resolution, the time evolution of the (–101) lattice diffraction peak following excitation using a 35 fs laser pulse. The dynamics at higher laser fluence indicates the existence of a transient lattice state distinct from the high temperature ferromagnetic phase. By extracting the lattice temperature and comparing it with values obtained in a quasi-static diffraction measurement, we estimate the electron–phonon coupling in FeRh thin films as a function of laser excitation fluence. A model is presented which demonstrates that the transient state is paramagnetic and can be reached by a subset of the phonon bands. A complete description of the FeRh structural dynamics requires consideration of coupling strength variation across the phonon frequencies.

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Femtosecond Optical Laser System with Spatiotemporal Stabilization for Pump-Probe Experiments at SACLA

Cited by 10 publications

References 38 publications

Ultrafast MHz‐Rate Burst‐Mode Pump–Probe Laser for the FLASH FEL Facility Based on Nonlinear Compression of ps‐Level Pulses from an Yb‐Amplifier Chain

Ultrafast MHz‐Rate Burst‐Mode Pump–Probe Laser for the FLASH FEL Facility Based on Nonlinear Compression of ps‐Level Pulses from an Yb‐Amplifier Chain

Serial Femtosecond Crystallography Reveals that Photoactivation in a Fluorescent Protein Proceeds via the Hula Twist Mechanism

Determination of sub-ps lattice dynamics in FeRh thin films

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