Numerical analysis of SRS conversion of terawatt femtosecond UV pulsesстатья
Информация о цитировании статьи получена из
Scopus,
Web of Science
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Местоположение издательства:[Bristol, UK], England
Первая страница:963
Последняя страница:970
Аннотация:The results of numerical modeling of nonstationary forward SRS of femtosecond pulses in molecular dispersive gases are presented. The calculations are carried out in one- dimensional two-wave approximation taking into account self- and cross-action of the pulses. For the first time the dynamics of a Stokes pulse build-up and the transformation of its spectrum and temporal shape during amplification are traced up to the saturation regime in CH4, NH3, H-2, and SF6. The fundamental role of group velocity mismatch, which determines the velocity of a Stokes pulse with respect to a pump pulse is revealed. It is shown that there exists a range of parameters where pulse compression takes place under optimum amplification with drastic sharpening of the leading edge of the pulse. The parameters of SRS converter based on an oscillator and a two-stage amplifier with beam summation at She second stage are calculated. The pumping high-power femtosecond excimer system produces two beams with an energy of 1 J each at the wavelength of 308 nm and pulse duration of 300 fs. The converter provides conversion efficiency up to 60%, threefold compression of the pulse, prepulse suppression, and sharpening of the leading edge.