title: Double-configuration grating monochromator for extreme-ultraviolet ultrafast pulses.
abstract: We present the design and characterization of a double-configuration grating monochromator for the spectral selection of extreme-ultraviolet ultrafast pulses. Two grating geometries are joined in an instrument with two interchangeable diffracting stages, both used at grazing incidence: one with the gratings in the off-plane mount (OPM), the other in the classical diffraction mount (CDM). The use of two stages gives great flexibility: the OPM stage is used for sub-50 fs time response and low spectral resolution, while the CDM stage is for 100-200 fs time response and high spectral resolution. The monochromator spectral and temporal performances have been experimentally demonstrated on a high-order laser-harmonics beam line.
authors.forename: L
authors.initials: L
authors.lastname: Poletto
authors.forename: P
authors.initials: P
authors.lastname: Miotti
authors.forename: F
authors.initials: F
authors.lastname: Frassetto
authors.forename: C
authors.initials: C
authors.lastname: Spezzani
authors.forename: C
authors.initials: C
authors.lastname: Grazioli
authors.forename: M
authors.initials: M
authors.lastname: Coreno
authors.forename: B
authors.initials: B
authors.lastname: Ressel
authors.forename: D
authors.initials: D
authors.lastname: Gauthier
authors.forename: R
authors.initials: R
authors.lastname: Ivanov
authors.forename: A
authors.initials: A
authors.lastname: Ciavardini
authors.forename: M
authors.initials: M
authors.lastname: de Simone
authors.forename: S
authors.initials: S
authors.lastname: Stagira
authors.forename: G
authors.initials: G
authors.lastname: De Ninno