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- Title
Frequency conversion of laser pulses in gold plasma: blueshift and splitting of high-order harmonics.
- Authors
Ganeev, R. A.; Eshchanov, B. K.; Iqbal, M.; Ahmedov, S. T.
- Abstract
We report the optimization of the high-order harmonic generation (HHG) in the laser-induced gold plasma. It includes determination of the characteristics of heating pulses allowing formation of the gold plasma possessing suitable characteristics (plasma density, electron density, electron temperature, velocity of plasma), as well as determination of the optimal delay between heating picosecond pulses and driving femtosecond pulses. Time-resolved Au plasma spectra and images allowed determining the velocity of plasma spreading (2 × 104 m s-1), electron density (3 × 1016 cm-3), and electron temperature (0.8 eV) of gold plasma at the optimal fluence of heating 150 ps pulses allowing HHG up to the 53rd order at the conversion efficiency of 1 × 10− 5. We also report the modification of the blueshift of harmonics at different regimes of HHG and plasma formation. The harmonic splitting onto strong blue component and weak red component appeared at 3 × 1014 W cm-2 intensity of 806 nm pump.
- Subjects
FREQUENCY changers; LASER pulses; LASER plasmas; FEMTOSECOND pulses; PICOSECOND pulses; HEAT pulses; ATTOSECOND pulses
- Publication
Applied Physics B: Lasers & Optics, 2024, Vol 130, Issue 6, p1
- ISSN
0946-2171
- Publication type
Article
- DOI
10.1007/s00340-024-08237-6