中央研究院 原子與分子科學研究所

Dramatic enhancement of optical field-ionization collisional-excitation x-ray lasing is achieved by using an optically-preformed plasma waveguide. With a 9-mm-long pure krypton plasma waveguide prepared by using the axicon-ignitor-heater scheme, lasing at 32.8 nm is enhanced by 400 folds relative to the case without the plasma waveguide. An output level of 8 x 10¹⁰ photon/shot is reached at an energy conversion efficiency of 2 x 10^-6. The same method is used to achieve x-ray lasing in a gas jet for the high-threshold low-gain transition at 46.9 nm in neon-like argon.