Influence of the main pulse and prepulse intensity on high-order harmonic generation in silver plasma ablation
L. B. Elouga BomInstitut National de la Recherche Scientifique, Énergie, Matériaux et Télécommunications, 1650 Lionel-Boulet, Varennes, Québec, Canada J3X 1S2J. C. KiefferInstitut National de la Recherche Scientifique, Énergie, Matériaux et Télécommunications, 1650 Lionel-Boulet, Varennes, Québec, Canada J3X 1S2R. A. GaneevScientific Association Akadempribor, Academy of Sciences of Uzbekistan, Akademgorodok, Tashkent 700125, UzbekistanM. SuzukiThe Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, JapanHiroto KurodaThe Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, JapanT. OzakiInstitut National de la Recherche Scientifique, Énergie, Matériaux et Télécommunications, 1650 Lionel-Boulet, Varennes, Québec, Canada J3X 1S2
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Abstract
We present experimental studies of high-order harmonic generation in silver plasma ablation performed with the Ti:sapphire laser beams of the Advanced Laser Light Source ($800\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$ wavelength, $360\phantom{\rule{0.3em}{0ex}}\mathrm{mJ}$ total energy). We have independently varied the intensity of the prepulse (which creates the plasma ablation) and the intensity of the main pulse (which generates the harmonics), and studied their influence on the harmonic spectrum. We show here that the presence of doubly ionized atoms in the ablation, created either by a strong prepulse intensity or with the irradiation of the main pulse, is ineffective for the generation of harmonics.
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