Generation of lower and higher harmonics in different plasma media with small <Emphasis Type="Italic">Z</Emphasis> |
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Authors: | R A Ganeev and H Kuroda |
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Institution: | 1.Institute of Electronics,Uzbekistan Academy of Sciences,Tashkent,Uzbekistan;2.Institute for Solid State Physics,University of Tokyo,Chiba,Japan;3.Saitama Medical University,Saitama,Japan |
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Abstract: | The generation of lower (third) and higher harmonics of femtosecond laser radiation in plasmas produced by laser ablation
of different targets with a small atomic number Z (B, Be, Li) has been investigated. The high (10−3) efficiency of third-harmonic generation was observed in plasma produced on the boron surface. Efficient third-harmonic generation
was also observed in beryllium plasma using femtosecond pulses of Ti:sapphire laser radiation (λ = 790 nm) and its second
harmonic (395 nm). We could tune the higher harmonics generation spectrum by tuning the crystal converter when using 395-nm
radiation to be converted. It is shown that, in plasmas formed on targets with small Z, the conversion efficiency and limiting generated harmonic order depend on the delay between the ablation pulse and the pulse
to be converted. |
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