Stuttgart 2012 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 54: Poster 3
Q 54.27: Poster
Thursday, March 15, 2012, 16:30–19:00, Poster.I+II
Performance of the Advanced Ligo laser — •Patrick Oppermann1, Christina Bogan1, Jan Hendrik Pöld1, Patrick Kwee1,2, Benno Willke1, and Karsten Danzmann1 — 1Albert-Einstein-Institut Hannover — 2MIT, Cambrige, USA
Most high precission measurements require a very stable and robust light source. The gravitational wave detector Advanced LIGO has very strict requirements according to the frequency and power stability as well as with the spatial beam profile of the injected continuous wave 200W Nd:YAG laser. Therefore a combined active and passive stabilization scheme is essentialy. In order to achieve a TEM00 mode content of more than 99.5% a bow-tie shaped cavity is used which also supress beam pointing and power noise at radio frequencies. For the frequency stabilization the laser system is stabilized to a high finesse reference cavity. The laser system is power stabilized to a relative power noise of 2*10e-8/sqrt(HZ) and provides an additional input to achieve a relative power noise of 2*10e-9/sqrt(Hz) at the interferometer input.
In this contribution the concepts and results of the stabilization of the Advanced LIGO laser will be presented. Particular attention is paid to the requirements of AdvLIGO, and how they can be fullfilled within the current power stabilization. A second key aspect is the complex structure of the frequency stabilization including an AOM in douple-pass configuration allowing for frequency shifts.