title: Tomography of high harmonic generation in a cluster jet.
abstract: Tomographic measurement of high harmonic generation in a cluster jet was demonstrated by programming the cluster density distribution with a laser machining technique. The growth of harmonic energy with the propagation of the pump pulse was resolved by scanning the end of the argon cluster distribution in the path of the pump pulse. A downstream shift of the position of rapid growth and a decrease of the slope with increasing backing pressure as results of changes in the phase-matching condition were observed, which explains the presence of an optimal backing pressure.
authors.affiliation: Department of Physics, National Taiwan University, Taipei 106, Taiwan.
authors.forename: Chih-Hao
authors.initials: CH
authors.lastname: Pai
authors.forename: Cheng-Cheng
authors.initials: CC
authors.lastname: Kuo
authors.forename: Ming-Wei
authors.initials: MW
authors.lastname: Lin
authors.forename: Jyhpyng
authors.initials: J
authors.lastname: Wang
authors.forename: Szu-yuan
authors.initials: SY
authors.lastname: Chen
authors.forename: Jiunn-Yuan
authors.initials: JY
authors.lastname: Lin