Optical design and suspension system of the kagra output mode-cleaner

Junko Kasuya, John Winterflood, Ju Li, Kentaro Somiya

Research output: Contribution to journalConference articlepeer-review

2 Citations (Scopus)


KAGRA is a Japanese large scale, underground, cryogenic gravitational telescope which is under construction in the Kamioka mine. For using cryogenic test masses, the sensitivity of KAGRA is limited mainly by quantum noise. In order to reduce quantum noise, KAGRA employs an output mode-cleaner (OMC) at the output port that filters out junk light but allows the gravitational wave signal to go through. The requirement of the KAGRA OMC is even more challenging than other telescopes in the world since KAGRA plans to tune the signal readout phase so that the signal-To-noise ratio for our primary target source can be maximized. A proper selection of optical parameters and anti-vibration devices is required for the robust operation of the OMC. In this proceeding, we show our final results of modal-model simulations, in which we downselected the cavity length, the round-Trip Gouy phase shift, the finesse, and the seismic isolation ratio for the suspended optics.

Original languageEnglish
Article number012009
JournalJournal of Physics: Conference Series
Issue number1
Publication statusPublished - 5 Mar 2018
Event12th Edoardo Amaldi Conference on Gravitational Waves, AMALDI 2017 - Pasadena, United States
Duration: 9 Jul 201714 Jul 2017


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