FEL2026 - 42nd International Free Electron Laser Conference

Session

Advanced FEL Modes (Invited)

FRY

28 Aug 2026, 10:30

73. Demonstration of Mode-Locked Frequency Comb for an X-Ray Free-Electron Laser (FRY01)

Wenxiang Hu (Paul Scherrer Institute, ETH Zurich)

28/08/2026, 10:30

Session 12: Advanced FEL Modes

Invited Oral Presentation

X-ray free-electron lasers (FELs) are powerful photon sources offering a wide wavelength range, subfemtosecond pulse duration, and high brightness. Most X-ray FELs are based on self-amplified spontaneous emission (SASE). SASE-FEL radiation has excellent transverse but only limited longitudinal coherence, with power and spectral profiles consisting of multiple randomly distributed spikes.
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78. Recent progress in attosecond X-ray free-electron lasers: direct observation for hard X-rays, high repetition rates, and spectrotemporal shaping (FRY02)

River Robles (Stanford University)

28/08/2026, 11:00

Session 12: Advanced FEL Modes

Invited Oral Presentation

Attosecond science with XFELs is a rapidly growing field. Nearly half of soft X-ray LCLS user experiments now use attosecond pulses. In this talk, I will present recent advances in the generation and characterization of attosecond pulses at the LCLS and LCLS-II, focusing on three main topics:
1. First direct observation of attosecond pulses in the hard X-ray domain.
2. Attosecond lasing in...