Development and application research of highly coherent X-ray laser at 13.9 nm

Nishikino, Masaharu; Hasegawa, Noboru; Kawachi, Tetsuya; Ochi, Yoshihiro; Nagashima, Keisuke; Tanaka, Momoko; Kishimoto, Maki; Kunieda, Yuichi; Yamatani, Hiroshi

We are developing plasma X-ray lasers pumped by ultra-short pulse lasers and have concentrated our efforts on developing a silver X-ray laser (13.9 nm) with spatially full coherence and application research using a highly coherent X-ray laser. Recently, we have developed a new pumping laser system, which is a CPA laser consisting of an OPCPA pre-amplifier and zigzag-slab type glass amplifiers. For the purpose of further application experiments, 0.1-Hz operation of the driver laser and the X-ray laser at a wavelength of 13.9 nm were succeeded.