科研之友
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摘要
In this article we present a theoretical analysis of high order harmonic generation (HHG) in gas jets with high intensity laser pulses. We estimate several laser and target parameters (i.e. focusing parameters-focus length, beam radius at the waist, length of the nonlinear medium, and concentration of the gas jet) involved in efficient conversion of a Nd3+ : YAG nanosecond laser radiation to higher frequencies.
First, we evaluate the wave vector mismatches, length of the nonlinear medium and focusing parameters for efficient generation of the fifth and seventh order harmonics generated in mixtures of sodium vapors and xenon. The theoretical findings are in good agreement with the experimental results published in the literature.
Second, in the case where the gas jet is produced by laser ablation, the condition for obtaining optimum gas density profile for HHG is evaluated by solving numerically the hydrodynamics of the ablation jet produced by a nanosecond laser pulse.
- 出版日期2015
