Kavli Affiliate: Richard Mittleman
| First 5 Authors: Jiri Smetana, Amit Singh Ubhi, Emilia Chick, Leonid Prokhorov, John Bryant
| Summary:
We present a pair of seismometers capable of measurement in all six axes of
rigid motion. The vacuum-compatible devices implement compact interferometric
displacement sensors to surpass the sensitivity of typical electrical readout
schemes. Together with the capability to subtract the sensitivity-limiting
coupling of ground tilt into horizontal motion, our seismometers can widen the
sensing band towards mHz frequencies. This has notable applications across a
range of fields requiring access to low-frequency signals, such as seismology
and climate research. We particularly highlight their potential application in
gravitational-wave observatories (LIGO) in improving their observation
capability of intermediate-mass black holes ($sim 1000,M_odot$). The sensors
are based on a near-monolithic fused-silica design consisting of a fused-silica
mass and fibre, showing improved stability and robustness to tilt drifts,
alignment, and control compared to all-metal or mixed metal-silica designs. We
demonstrate tilt sensitivity that surpasses the best commercial alternatives in
a significantly reduced footprint compared to our previous iterations of these
sensors.
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