Seminar Title:	Optical Simulations for LISA Pathfinder and LISA
Speaker:	Dr.Gudrun Wanner and Evgenia Granova
Affiliation:	(Albert-Einstein-Institute (AEI), Hannover, Germany)
When:	Tuesday Morning, Mar. 1st, 10:00 a.m
Where:	Room 327, Office Block, 2 West Beijing Road (PMO, CAS)
	Welcome to Attend
	( PMO Academic Committee & Academic Circulating committee)

　Abstract　　

The Laser Interferometer Space Antenna - LISA - is a planned gravitational wave detector consisting of three spacecraft in a heliocentric orbit. LISA will be launched at the end of this decade. Its technology demonstration mission LISA Pathfinder is in a highly advanced stage and will launch in 2013. The key technology of both missions is the interferometric pathlength readout, which monitors the distance between two proof masses with picometer accuracy. In order to predict the interferometric readout and thereby the measurement precision, software tools were developed at the AEI, which trace mainly gaussian beams through arbitrary optical systems and generate heterodyne signals. These software tools were used in the past to detect critical items, predict cross coupling in the optical readout channels and designimaging systems. 

In our talk, we will present interferometric readout principles of both missions, tools and signals used to achieve high precision alignment of the interferometers, residual alignment tolerances and how these affect the readout and measurement precision, as well as the software tools upon which our predictions are based.