X-ray production and second harmonic generation by superintense femtosecond laser pulses in the solids with restricted thermal conductionстатья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Two new types of targets: ultrathin freely suspended carbon films and porous Si, both revealing thermoconductivity restriction leading to plasma overheating upto electron temperature above 1 keV under "moderate" intensities 10(15) - 10(16) W.cm(-2) has been investigated experimentally. For the ultrathin carbon film of 20-30 nm X-ray yield threefold increase has been observed. Computer simulations decribe well the observed behaviour of the X-ray yield, and the electron temperature of 700 eV was deducted for the him of 10 nn in thickness. For-Si produces greater X-ray flux under intensity of 10(16) W.cm(-2) as compared to the solid Si. If the intensity increased the total X- ray yield from per-Si undergoes "saturation", while the X-ray yield from solid Si fits as approximate to I-2. Simple model to describe the "overheating" of Si plasma using a set of ultrathin films is developed. Some promising advantages of new targets are discussed.