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

TY - JOUR

T1 - Efficiency control of high-order harmonic generation in gases using driving pulse spectral features

AU - Nefedova, V. E.

AU - Ciappina, M. F.

AU - Finke, O.

AU - Albrecht, M.

AU - Kozlová, M.

AU - Nejdl, J.

N1 - Publisher Copyright: © 2018 Author(s).

PY - 2018/11/5

Y1 - 2018/11/5

N2 - 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. Consequently, our findings can be exploited to obtain essential information about the laser-plasma interaction process during HHG and can pave the way for a more convenient control of optimal HHG conditions.

AB - 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. Consequently, our findings can be exploited to obtain essential information about the laser-plasma interaction process during HHG and can pave the way for a more convenient control of optimal HHG conditions.

UR - http://www.scopus.com/inward/record.url?scp=85056283846&partnerID=8YFLogxK

U2 - 10.1063/1.5050691

DO - 10.1063/1.5050691

M3 - 文章

AN - SCOPUS:85056283846

SN - 0003-6951

VL - 113

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 19

M1 - 191101

ER -