title: Experimental observation of short-pulse upshifted frequency microwaves from a laser-created overdense plasma.
abstract: A short and frequency upshifted from a source microwave pulse is experimentally generated by the overdense plasma that is rapidly created by a laser. The source wave, whose frequency is 9 GHz, is propagating in the waveguide filled with tetrakis-dimethyl-amino-ethylene gas, which is to be converted to the overdense plasma by the laser. The detected frequency of the pulse is over 31.4 GHz and its duration is 10 ns. This technique has the potential for the generation of a tunable frequency source.
authors.affiliation: Department of Energy and Environmental Science, Graduate School of Utsunomiya University, 7-1-2 Yoto, Utsunomiya, Tochigi 321-8585, Japan. yugami@cc.utsunomiya-u.ac.jp
authors.forename: Noboru
authors.initials: N
authors.lastname: Yugami
authors.forename: Toshihiko
authors.initials: T
authors.lastname: Niiyama
authors.forename: Takeshi
authors.initials: T
authors.lastname: Higashiguchi
authors.forename: Hong
authors.initials: H
authors.lastname: Gao
authors.forename: Shigeo
authors.initials: S
authors.lastname: Sasaki
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Ito
authors.forename: Yasushi
authors.initials: Y
authors.lastname: Nishida