Editorial use only.
LIGO gravitational wave detector optics. Engineer upgrading the optics used in the Laser Interferometer Gravitational-Wave Observatory (LIGO). This is the transmission monitor suspension (TMS) system for the interferometer sensing and control (ISC) system. LIGO compares measurements between two detector sites 3000 kilometres apart in Washington and Louisiana, USA. Each site uses laser interferometers to monitor light beams bounced between mirrors, looking for small changes caused by gravitational waves. LIGO has been operating since 2002, with an advanced upgrade (aLIGO) operating since 2015. On 11th February 2016 it was announced that gravitational waves had been detected by LIGO. The signal was detected on 14th September 2015, and was the result of two black holes colliding 1.3 billion years ago. Photographed on 10 February 2014.
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