GEO600 in 2012: Preparations for the laser power increase
In the fall of 2012, GEO600 scientists worked inside of two vacuum tanks inside the central laboratory building of the detector. They sealed them off from the rest of the detector and vented them to exchange four mirrors and replace some optical modulators.
Their goal was to increase the laser power in GEO600 and to improve its sensitivity. The work was a great success: https://www.geo600.org/25777/2012.
Read more in the @LIGO Magazine at https://www.aei.mpg.de/1206901/LIGO-magazine-issue-2.pdf [PDF, page 20]
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