English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

In contrast to the case of quasi-monochromatic waves, a focused optical pulsein the few-cycle limit may exhibit two independent curved wavefronts,associated with phase and group retardations, respectively. Focusing opticalelements will generally affect these two wavefronts differently, thus leadingto very different behavior of the pulse near focus. As limiting cases, weconsider an ideal diffractive lens introducing only phase retardations and aperfect non-dispersive refractive lens (or a curved mirror) introducing equalphase and group retardations. We study the resulting diffraction effects on thepulse, finding both strong deformations of the pulse shape and shifts in thespectrum. We then show how important these effects can be in highly nonlinearoptics, by studying their role in attosecond pulse generation. In particular,the focusing effects are found to affect substantially the generation ofisolated attosecond pulses in gases from few-cycle fundamental optical fields.

Influence of generalized focusing of few-cycle Gaussian pulses in attosecond pulse generation