High brightness soft x-ray generation by phase-matched high-order harmonics with a 10 cm interaction length

Summary from only given. For the development of a variety of applications of high-order harmonics (HH), one of the most important issues is energy scaling. Recently, by using phase-matching process, high conversion efficiencies were achieved. In this study, as the next step, we investigated the energy scaling of the phase-matched HH. To satisfy the phase matching condition, a large energy pump pulse was loosely focused by a f = 5000 mm planoconvex lens into the long cell with a 10 cm interaction length. The experimental ware carried out with a 10 Hz Ti:sapphire laser system based on a chirped pulse amplification.