1997 年 66 巻 2 号 p. 388-391
High-order harmonic generation by an oscillating current due to intense laser electric fields in dense plasmas is investigated. In solid target plasmas produced by an intense ultra-short pulse laser, the intense laser radiation directly interacts with overdense plasmas. In such a case, plasma screening effects are important in the plasma response to the laser field. For such plasmas, the higher harmonics are evaluated by using a dynamical form factor for plasma electrons and ions. There is a peak in the harmonic spectrum at twice the plasma frequency.
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