1–6 Jun 2025
Taipei International Convention Center (TICC)
Asia/Taipei timezone

Switchable X-ray orbital angular momentum from a cavity-based free electron laser

MOPB090
2 Jun 2025, 16:00
2h
Exhibiton Hall A _Bear (TWTC)

Exhibiton Hall A _Bear

TWTC

Poster Presentation MC2.A06 Free Electron Lasers (FELs) Monday Poster Session

Speaker

Nanshun Huang (Shanghai Zhangjiang Laboratory)

Description

X-ray vortices carrying tunable Orbital Angular Momentum (OAM) are an emerging tool for X-ray characterization technology. However, in contrast to the generation of vortex beams in the visible wavelength region, the generation of X-ray vortices in a controlled manner has proved challenging. Here, we demonstrate an X-ray free-electron laser oscillator (XFELO) can adjust only the kinetic energy of the electron beam to produce vortex beams that can be programmed to dynamically change between different OAM modes, without the need for additional optical elements. With the nominal parameters of currently constructing 1 MHz repetition rate facility (i.e. SHINE), the active formation of the OAM modes of l = ±1 and l = ±2 and the rapid switching between them by detuning the electron beam energy of the XFELO are numerically illustrated. The real-time switching can be achieved within 200 μs, while the output pulse energy can reach the 100 μJ level. This result extends the capabilities of XFELOs, and paves the way for advanced at-source applications using X-ray vortex beams.

Region represented Asia

Author

Nanshun Huang (Shanghai Zhangjiang Laboratory)

Co-author

Haixiao Deng (Shanghai Institute of Applied Physics)

Presentation materials

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