Abstract
High-order harmonic generation (HHG) in atoms and molecules allows the study of the static and dynamic properties of these systems. We present the results of HHG studies in the plasmas produced using femtosecond and picosecond laser pulses on the surfaces of lanthanides and their oxides (La, Yb, Pr6O11, and Tb4O7). The plasmas induced by femtosecond pulses have proven to be a more efficient medium for HHG than the plasmas produced by picosecond pulses in the case of two-color pump HHG. We analyze the advantages of laser ablation using femtosecond pulses for the extension of the cutoff energy of generated harmonic in lanthanide plasma. We have shown that Yb plasma is the efficient medium for the harmonic generation up to the 73rd order, which is one of the largest orders generated in laser-produced plasmas.
Highlights
From the very beginning, high-order harmonic generation (HHG) in gases and laser-produced plasmas (LPPs) provided a promising route for generating coherent extreme ultraviolet (XUV) radiation.1–4 The straightforward approach to explain HHG is based on the semi-classical three step model.5–7 The advantages of HHG in gases rely on their high ionization potential, which allowed demonstration of extended harmonic cutoffs
HHG during propagation of ultrashort laser pulses through LPPs allowed demonstrating various features of this process, which were not shown during gas HHG studies
We chose four lanthanides (La, Yb, Pr6O11, and Tb4O7) for analysis of the high-order nonlinear optical properties of the LPPs produced on the surfaces of those targets
Summary
High-order harmonic generation (HHG) in gases and laser-produced plasmas (LPPs) provided a promising route for generating coherent extreme ultraviolet (XUV) radiation.1–4 The straightforward approach to explain HHG is based on the semi-classical three step model.5–7 The advantages of HHG in gases rely on their high ionization potential, which allowed demonstration of extended harmonic cutoffs. We report the generation of coherent XUV radiation in the plasmas containing lanthanide elements ablated by picosecond and femtosecond laser pulses.
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