LIGO Document P1700133-v4

A compact, large-range interferometer for precision measurement and inertial sensing

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We present a compact fibre-coupled interferometer with high sensitivity and a large working range. We propose to use this interferometer as a readout mechanism for future inertial sensors, removing a major limiting noise source, and for use in precision positioning systems. The interferometer’s peak sensitivity is 2 *10^(-14)m/rt(Hz) at 70Hz and 8*10^(11)m/rt(Hz) at 10mHz. If deployed on a GS-13 geophone, the resulting inertial sensing output will be dominated by suspension thermal noise from 2Hz to 50mHz.
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