Efficiency control of high-order harmonic generation in gases using driving pulse spectral features

0501547 - FZÚ 2019 RIV US eng J - Journal Article
Nefedova, Victoria - Ciappina, Marcelo F. - Finke, Ondřej - Albrecht, Martin - Kozlová, Michaela - Nejdl, Jaroslav
Efficiency control of high-order harmonic generation in gases using driving pulse spectral features.
Applied Physics Letters. Roč. 113, č. 19 (2018), s. 1-6, č. článku 191101. ISSN 0003-6951. E-ISSN 1077-3118
R&D Projects: GA MŠMT LQ1606
Institutional support: RVO:68378271
Keywords : high-order harmonic generation * conversion efficiency * spectral shift * nonlinear propagation
OECD category: Fluids and plasma physics (including surface physics)
Impact factor: 3.521, year: 2018

The low conversion efficiency of high-order harmonic generation (HHG) in gases is an insurmountable limitation for many applications, where a considerable photon flux is an instrumental prerequisite. We present a study of the HHG conversion efficiency dependence on the driving laser intensity and analyze the conditions for optimal phase-matching in a loose focusing configuration and long generation medium using a Ti:Sapphire laser. Moreover, by determination of the influence of plasma effects on the driving laser pulse, we observe a correlation between the HHG conversion efficiency and the blueshift of the fundamental pulse. The maximal HHG conversion efficiency is achieved just before the driving laser spectrum is considerably affected by the plasma. Similar behavior is observed in HHG for different noble gases. In this respect, the appearance of a plasma-induced spectral shift in the driving laser might serve as an indication of a substantial loss of HHG conversion efficiency.
Permanent Link: http://hdl.handle.net/11104/0293560