title: Real-time phase-front detector for heterodyne interferometers.
abstract: We present a real-time differential phase-front detector sensitive to better than 3 mrad rms, which corresponds to a precision of approximately 500 pm. This detector performs a spatially resolving measurement of the phase front of a heterodyne interferometer, with heterodyne frequencies up to approximately 10 kHz. This instrument was developed as part of the research for the Laser Interferometer Space Antenna Technology Package interferometer and will assist in the manufacture of its flight model. Because of the advantages this instrument offers, it also has general applications in optical metrology.
authors.affiliation: Max-Planck-Institut für Gravitationsphysik, Albert-Einstein-Institut Hannover, Germany. felipe.guzman@aei.mpg.de
authors.forename: Felipe Guzmán
authors.initials: FG
authors.lastname: Cervantes
authors.forename: Gerhard
authors.initials: G
authors.lastname: Heinzel
authors.forename: Antonio F García
authors.initials: AF
authors.lastname: Marín
authors.forename: Vinzenz
authors.initials: V
authors.lastname: Wand
authors.forename: Frank
authors.initials: F
authors.lastname: Steier
authors.forename: Oliver
authors.initials: O
authors.lastname: Jennrich
authors.forename: Karsten
authors.initials: K
authors.lastname: Danzmann