The O2 Pre-Stabilized laser system was the laser bench used for the first run of observation of Advanced VIRGO from December 2016 to August 2017. During this run of operation VIRGO interferometer realized its first detection of gravitational wave from a black holes binary merger the 14th August 2017 and the first detection of neutron star merger with electromagnetic counterpart the 17th August 2017.It has been replaced by the O3 Laser bench in december 2017.

GW170814 signal.png

Left picture : Signals of the first detection of a gravitational wave by Advanced VIRGO the 14th August 2017

Right picture : Electromagnetic observation with Hubble space telescope after the neutron star merger detection the 17th August 2020. Birth of the multimessenger astronomy


The 60 W laser bench was based on the laser bench used for VIRGO+ phase of VIRGO. It was reinstalled from automun 2013 for the building, commissiong and first run of Advanced VIRGO. The bench comprised a 20 W Nd3+:YAG laser injection locked onto a non planar ring Nd3+:YVO4 Laser and amplified by a 60 W 4 Nd3+:YVO4 cristals amplifier. The laser beam was filtered by a triangular Fabry-Perot cavity before being delivered to the injection bench of Advanced VIRGO


  • Dr. Catherine Nary Man : sub-system manager - senior research fellow (now emeritus) - CNRS
  • Dr. Fabien Kéfélian : optics & laser associate professor
  • Dr. Margherita Turconi : optics & laser engineer (contract) 2013-2015
  • Dr. Frédéric Cléva : optics & laser engineer
  • Jean-Pierre Coulon : electronics engineer
  • Mourad Merzoughi : mecanics engineer
  • Dr. Alain Brillet : senior research fellow (retired)

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 60W Bench