High-order harmonic generation has been observed in a gaseous medium with laser pulses of intensities I=10/sup 13//spl sim/10/sup 15/ W/cm/sup 2/, of which radiation field becomes comparable to or in excess of the typical atomic Coulomb field of 10/sup 8//spl sim/10/sup 9/ V/cm. There has been a significant interest in this phenomenon at a strong field, because the harmonic generation properties observed so far have suggested a new domain of nonlinear optics associated with breakdown of the conventional radiative perturbation theory and provides a promising approach to a useful (tunable) coherent soft X-ray radiation source. This paper reports the high-order harmonic generation in He and Ne with a fsec Ti:sapphire laser at intensities above 10/sup 15/ W/cm/sup 2/, where the highest order of harmonic has been observed up to the 103rd (7.6 nm) in He and the 95th (8.2 nm) in Ne, and a systematic study of competing processes at the high intensity has been made.<>


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    Title :

    High-order harmonic generation in the soft X-ray to XUV by ultrashort laser pulses


    Contributors:
    Miyazaki, K. (author) / Takada, H. (author) / Torizuka, K. (author)

    Published in:

    Publication date :

    1993-01-01


    Size :

    171604 byte




    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



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