title: Seeding of a soft-x-ray laser in a plasma waveguide by high harmonic generation.
abstract: A strongly saturated waveguide-based optical-field-ionization soft-x-ray laser seeded by high harmonic generation was demonstrated for Ni-like Kr lasing at 32.8 nm. Compared with the same laser seeded only with spontaneous emission, seeding with high harmonics yields much smaller divergence, enhanced spatial coherence, and controlled polarization. The integration of high harmonic seeding, optically preformed plasma waveguide, and optical-field-ionization pumping forms one of the optimal archetypes of an ultrashort-pulse soft-x-ray laser.
authors.affiliation: Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 106, Taiwan.
authors.forename: Ping-Hsun
authors.initials: PH
authors.lastname: Lin
authors.forename: Ming-Chang
authors.initials: MC
authors.lastname: Chou
authors.forename: Ming-Jhe
authors.initials: MJ
authors.lastname: Jiang
authors.forename: Po-Chang
authors.initials: PC
authors.lastname: Tseng
authors.forename: Hsu-Hsin
authors.initials: HH
authors.lastname: Chu
authors.forename: Jiunn-Yuan
authors.initials: JY
authors.lastname: Lin
authors.forename: Jyhpyng
authors.initials: J
authors.lastname: Wang
authors.forename: Szu-Yuan
authors.initials: SY
authors.lastname: Chen