Variable pattern of high-order harmonic spectra from a laser-produced plasma by using the chirped pulses of narrow-bandwidth radiation

R. A. Ganeev, M. Suzuki, P. V. Redkin, M. Baba, and H. Kuroda

Phys. Rev. A 76, 023832 – Published 31 August 2007

Abstract

Various plasmas prepared by laser ablation of the surfaces of solid targets were examined by the narrow-bandwidth radiation of different chirp and pulse durations. The high-order harmonics generated during laser-plasma interaction showed different brightness, wavelength shift, harmonic cutoff, and efficiency by using variable chirps of pump radiation. An analysis of harmonic optimization at these conditions is presented. The blueshifted and redshifted harmonics observed in this case were analyzed and attributed to the abundance of free electrons and self-phase modulation of the driving pulse. The resonance-induced enhancement of the 15th harmonic from GaN-nanoparticle-containing plasma caused by the tuning of harmonic wavelength close to the ionic transition was demonstrated.

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Received 21 May 2007

DOI:https://doi.org/10.1103/PhysRevA.76.023832

Authors & Affiliations

R. A. Ganeev^1,2,*, M. Suzuki¹, P. V. Redkin³, M. Baba¹, and H. Kuroda¹

¹The Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
²Scientific Association Akadempribor, Academy of Sciences of Uzbekistan, Akademgorodok, Tashkent 100125, Uzbekistan
³Samarqand State University, Samarqand 703004, Uzbekistan

^*Author to whom correspondence should be addressed. ṟganeev@issp.u-tokyo.ac.jp

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Vol. 76, Iss. 2 — August 2007

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