Design of a compact, high-resolution velocity-map imaging spectrometer for attosecond spectroscopy
Résumé
We present the design of a VMI spectrometer optimized for attosecond spectroscopy in the 0-40 eV energy range. It is based on a compact 3-electrode configuration where the lens shape, size and material have been optimized using numerical simulations to improve the spectral resolution by a factor ∼5 relative to the initial design 1 while keeping a flat spectral response in the 10-40 eV range. The experimental performance is tested using an attosecond source based on high-order harmonic generation. A good agreement is observed between the measured and simulated spectral resolution. At low kinetic energy, the electrostatic lens remains the limiting factor, while the high energy range is mostly affected by the resolution of the camera objective.
Domaines
Physique [physics]Origine | Fichiers éditeurs autorisés sur une archive ouverte |
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