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arXiv · 1512.05911

Optical Gravitational Wave Antenna with Increased Power Handling Capability

Andrey B. Matsko·Mikhail V. Poplavskiy·Hiroaki Yamamoto·Sergey P. Vyatchanin
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Abstract

Fundamental sensitivity of an optical interferometric gravitational wave detector increases with increase of the optical power which, in turn, limited because of the opto-mechanical parametric instabilities of the interferometer. We propose to optimize geometrical shape of the mirrors of the detector to reduce the diffraction-limited finesse of unessential optical modes of the interferometer resulting in increase of the threshold of the opto-mechanical instabilities and subsequent increase of the measurement sensitivity. Utilizing parameters of the LIGO interferometer we found that the proposed technique allows constructing a Fabry-Perot interferometer with round trip diffraction loss of the fundamental mode not exceeding $5$~ppm, whereas the loss of the first dipole as well as the other high order modes exceed $1,000$~ppm and $8,000$~ppm, respectively. The optimization comes at the price of tighter tolerances on the mirror tilt stability, but does not result in a significant modification of the optical beam profile and does not require changes in the the gravity detector read-out system. The cavity with proposed mirrors is also stable with respect to the slight modification of the mirror shape.

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Andrey B. Matsko, Mikhail V. Poplavskiy, Hiroaki Yamamoto, Sergey P. Vyatchanin. 2015-12-18. Optical Gravitational Wave Antenna with Increased Power Handling Capability. https://doi.org/10.1103/physrevd.93.083010

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