### Abstract

It was observed experimentally that high power laser light (I approx. 10**1**6W/cm**2) as produced by the CO//2-laser Gemini and Helios systems generates very high harmonics with nearly constant efficiency over several high harmonics with a cutoff given by the local plasma frequency at the upper density shelf. We study the response of a strongly inhomogeneous plasma to the high power laser light. We derive the equation of electron motion in lagrangean variables and find the conditions on the density scale length and power intensities for wavebreaking (typically, one waveperiod for density profile L//n approx. 0. 1 lambda and I approx. 10**1**6W/cm**2 near the critical layer). We show that the source of a given high harmonic frequency is localized around the density region corresponding to a local plasma wave at that frequency.

Original language | English |
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Title of host publication | Laser Interaction and Related Plasma Phenomena |

Editors | Heinreich Hora, George H Miley |

Publisher | Plenum Press |

Pages | 401-415 |

Number of pages | 15 |

Volume | 6 |

ISBN (Electronic) | 978-1-4615-7332-6 |

ISBN (Print) | 978-1-4615-7334-0 |

Publication status | Published - 1984 |

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### ASJC Scopus subject areas

- Engineering(all)

### Cite this

*Laser Interaction and Related Plasma Phenomena*(Vol. 6, pp. 401-415). Plenum Press.

**High Harmonic Generation in High Power Lasers.** / Grebogi, Celso; Tripathi, Vipin K.; Chen, Hsing Hen.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

*Laser Interaction and Related Plasma Phenomena.*vol. 6, Plenum Press, pp. 401-415.

}

TY - GEN

T1 - High Harmonic Generation in High Power Lasers

AU - Grebogi, Celso

AU - Tripathi, Vipin K.

AU - Chen, Hsing Hen

PY - 1984

Y1 - 1984

N2 - It was observed experimentally that high power laser light (I approx. 10**1**6W/cm**2) as produced by the CO//2-laser Gemini and Helios systems generates very high harmonics with nearly constant efficiency over several high harmonics with a cutoff given by the local plasma frequency at the upper density shelf. We study the response of a strongly inhomogeneous plasma to the high power laser light. We derive the equation of electron motion in lagrangean variables and find the conditions on the density scale length and power intensities for wavebreaking (typically, one waveperiod for density profile L//n approx. 0. 1 lambda and I approx. 10**1**6W/cm**2 near the critical layer). We show that the source of a given high harmonic frequency is localized around the density region corresponding to a local plasma wave at that frequency.

AB - It was observed experimentally that high power laser light (I approx. 10**1**6W/cm**2) as produced by the CO//2-laser Gemini and Helios systems generates very high harmonics with nearly constant efficiency over several high harmonics with a cutoff given by the local plasma frequency at the upper density shelf. We study the response of a strongly inhomogeneous plasma to the high power laser light. We derive the equation of electron motion in lagrangean variables and find the conditions on the density scale length and power intensities for wavebreaking (typically, one waveperiod for density profile L//n approx. 0. 1 lambda and I approx. 10**1**6W/cm**2 near the critical layer). We show that the source of a given high harmonic frequency is localized around the density region corresponding to a local plasma wave at that frequency.

UR - http://www.scopus.com/inward/record.url?scp=0021724359&partnerID=8YFLogxK

M3 - Conference contribution

SN - 978-1-4615-7334-0

VL - 6

SP - 401

EP - 415

BT - Laser Interaction and Related Plasma Phenomena

A2 - Hora, Heinreich

A2 - Miley, George H

PB - Plenum Press

ER -