title: Three-directional spectral dispersion for smoothing of a laser irradiance profile.
abstract: In inertial confinement fusion research, uniform laser irradiation on a fusion target is a key issue. We propose a new method of beam smoothing in which we use three-directional spectral dispersion to reduce the coherent speckle that is unavoidable in the usual two-directional spectral-dispersion scheme. We have used this smoothing technique in a Nd:glass laser system and have demonstrated that the coherent speckle is reduced by a factor of 2.9 from that in two-directional spectral dispersion.
authors.forename: G
authors.initials: G
authors.lastname: Miyaji
authors.forename: N
authors.initials: N
authors.lastname: Miyanaga
authors.forename: S
authors.initials: S
authors.lastname: Urushihara
authors.forename: K
authors.initials: K
authors.lastname: Suzuki
authors.forename: S
authors.initials: S
authors.lastname: Matsuoka
authors.forename: M
authors.initials: M
authors.lastname: Nakatsuka
authors.forename: A
authors.initials: A
authors.lastname: Morimoto
authors.forename: T
authors.initials: T
authors.lastname: Kobayashi