title: Coherent water window x ray by phase-matched high-order harmonic generation in neutral media.
abstract: We demonstrate the generation of a coherent water window x ray by extending the plateau region of high-order harmonics under a neutral-medium condition. The maximum harmonic photon energies attained are 300 and 450 eV in Ne and He, respectively. Our proposed generation scheme, combining a 1.6 microm laser driver and a neutral Ne gas medium, is efficient and scalable in output yields of the water window x ray. Thus, the precept of the design parameter for a single-shot live-cell imaging by contact microscopy is presented.
authors.affiliation: Extreme Photonics Research Group, RIKEN Advanced Science Institute, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan. ejtak@riken.jp
authors.forename: Eiji J
authors.initials: EJ
authors.lastname: Takahashi
authors.forename: Tsuneto
authors.initials: T
authors.lastname: Kanai
authors.forename: Kenichi L
authors.initials: KL
authors.lastname: Ishikawa
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Nabekawa
authors.forename: Katsumi
authors.initials: K
authors.lastname: Midorikawa