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30 September 2005 Ablation harmonics: a novel technique for highly efficient harmonic generation
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We demonstrate the first observation of significant resonance enhancement of a single high-order harmonic in the extreme ultraviolet region. Such intense harmonics are generated during the interaction of a femtosecond Ti:sapphire laser pulse with low-ionized indium ablation. A strong 13th harmonic (61.2 nm) with conversion efficiency of 8×10-5 and output intensity almost two orders of magnitude higher than neighbouring harmonics is demonstrated. Such an approach paves the way for efficient single-harmonic enhancement in the extreme ultraviolet range using different ablation sources.
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T. Ozaki, R. A. Ganeev, M. Suzuki, M. Baba, and H. Kuroda "Ablation harmonics: a novel technique for highly efficient harmonic generation", Proc. SPIE 5971, Photonic Applications in Nonlinear Optics, Nanophotonics, and Microwave Photonics, 59710A (30 September 2005);

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