Annular coherent wake emission

Hadar Yehuda, Elkana Porat, Itamar Cohen, Raz Halifa Levi, Assaf Levanon, Ishay Pomerantz*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Coherent wake emission may be generated only by sufficiently high-contrast driving laser pulses. When the laser contrast is too low, the formed long-scale-length plasma cannot support its generation. In this Letter, we show how, by gently spoiling a pristine laser contrast in an engineered way, coherent wake emission becomes inhibited in the center of the irradiated substrate only, thus forming an annular-shaped source of coherent extreme ultraviolet (XUV) pulses. We present an analytical model that describes the phenomenon and validation of its predictions in the experiment and the simulation. We also show how the ion-acoustic velocity dependency on the laser intensity may be obtained from the emission patterns and offer examples for future applications.

Original languageEnglish
Pages (from-to)4674-4677
Number of pages4
JournalOptics Letters
Issue number18
StatePublished - 15 Sep 2021


FundersFunder number
Engineering and Physical Sciences Research CouncilEP/G054940/1


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