High-Order Harmonic Generation in Dense Plasmas with a High Intensity Light Field.

  • Kato Susumu
    Institute of Laser Engineering, Osaka University, Suita, Osaka 565
  • Nishiguchi Akio
    Osaka Institute of Technology, Asahi–ku, Osaka 535
  • Miyamoto Seiji
    Institute of Laser Engineering, Osaka University, Suita, Osaka 565
  • Mima Kunioki
    Institute of Laser Engineering, Osaka University, Suita, Osaka 565

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  • High-Order Harmonic Generation in Dense

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Abstract

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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