title: Measuring vibration amplitudes in the picometer range using moving light gratings in photoconductive GaAs:Cr.
abstract: We report the measurements of picometer vibration amplitudes produced by a piezo mirror in an interferometric setup, using a GaAs:Cr photoconductive device. The moving light fringes (gratings) induce in this new detector periodic photocurrents characterized by efficient suppression of the low-frequency drifts of the working point and low sensitivity to the amplitude laser noise. The optimum operation conditions of this system are also shown.
authors.forename: S I
authors.initials: SI
authors.lastname: Stepanov
authors.forename: I A
authors.initials: IA
authors.lastname: Sokolov
authors.forename: G S
authors.initials: GS
authors.lastname: Trofimov
authors.forename: V I
authors.initials: VI
authors.lastname: Vlad
authors.forename: D
authors.initials: D
authors.lastname: Popa
authors.forename: I
authors.initials: I
authors.lastname: Apostol