title: Characteristics of beam alignment in a high power four-pass laser amplifier.
abstract: Beam alignment is used to control the pointing, rotation, and position of a beam automatically. We give an overview of the beam alignment system for a four-pass amplifier system. The coupling relationships between dependent quantities and deviations thereof for parameters of key optical elements are analyzed using matrix optics techniques. The rotation characteristics of a near field are discussed. The characteristics of the four-pass adjustment in the cavity spatial filter are shown and the output characteristics are provided. Finally, we develop an adjustment procedure.
authors.affiliation: Shanghai Institute of Optics and Fine Mechanics, Shanghai 201800, China.
authors.forename: Yan-Qi
authors.initials: YQ
authors.lastname: Gao
authors.forename: Bao-Qiang
authors.initials: BQ
authors.lastname: Zhu
authors.forename: Dai-Zhong
authors.initials: DZ
authors.lastname: Liu
authors.forename: Xiao-Feng
authors.initials: XF
authors.lastname: Liu
authors.forename: Zun-Qi
authors.initials: ZQ
authors.lastname: Lin