A novel concept for increasing the peak sensitivity of LIGO by detuning the arm cavities

Details A novel concept for increasing the peak sensitivity of LIGO by detuning the arm cavities A novel concept for increasing the peak sensitivity of LIGO by detuning the arm cavities

2007-09-10

arxiv.org/abs/0709.1488v1

Class.Quant.Grav.24:5453-5460,2007

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

8 pages, 4 figures

Scientific paper

10.1088/0264-9381/24/22/010

We introduce a concept that uses detuned arm cavities to increase the shot noise limited sensitivity of LIGO without increasing the light power inside the arm cavities. Numerical simulations show an increased sensitivity between 125 and 400 Hz, with a maximal improvement of about 80% around 225 Hz, while the sensitivity above 400Hz is decreased. Furthermore our concept is found to give a sensitivity similar to that of a conventional RSE configuration with a Signal-Recycling mirror of moderate reflectivity. In the near future detuned arm cavities might be a beneficial alternative to RSE, due the potentially less hardware intensive implementation of the proposed concept.

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