The LTP interferometer and phasemeter

doi:10.1088/0264-9381/21/5/029

The LTP interferometer and phasemeter

2004-02-09

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DOI：10.1088/0264-9381/21/5/029

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The LISA Technology Package (LTP), to be launched by ESA in 2006/2007, is a technology demonstration mission in preparation for the LISA space-borne gravitational wave detector. A central part of the LTP is the optical metrology package (heterodyne interferometer with phasemeter) which monitors the distance between two test masses with a noise level of 10 pm Hz(-1/2) between 3 mHz and 30 mHz. It has a dynamic range of >100 mum without any actuators for the pathlength. In addition to the longitudinal measurements, it provides alignment measurements with an expected noise level of <10 nrad Hz(-1/2), While the basic design has been described previously by Heinzel et al (2003 Class. Quantum Grav. 20 S153-61), this paper gives new details on the laser stabilization, the phasemeter and recent prototype results.

The LTP interferometer and phasemeter

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