Abstract
In this Letter, we report on the creation of hard x-ray beams carrying orbital angular momentum of topological charge −ℏ and −3ℏ at a photon energy of 8.2 keV via spiral phase plates made out of fused silica by ultrashort-pulsed laser ablation. The phase plates feature a smooth phase ramp with a 0.5 μm nominal step height and a surface roughness of 0.5 μm. The measured vortex beams show submicrometer-sized donut rings and agree well with numerical modeling. Fused silica phase plates are potentially suited to manipulate the electromagnetic field in highly intense x-ray beams at x-ray free-electron laser sources.
Original language | English |
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Pages (from-to) | 4622-4625 |
Number of pages | 4 |
Journal | Optics Letters |
Volume | 44 |
Issue number | 18 |
DOIs | |
Publication status | Published - 2019 Sept 15 |
Externally published | Yes |
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Hankin, L. (Manager)
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