Speaker
Description
We will report our progress on the development of our compact low-frequency optomechanical accelerometers, which consist of monolithically fabricated mechanical resonators that are read out by miniaturized heterodyne laser interferometers. The resonators are made of fused-silica, with a test mass of approximately 2.5 grams and a mechanical quality factor of 4.77x10$^5$ at 4.7 Hz.
We have conducted comparison measurements with a commercial low-frequency seismometer to an excellent agreement, the Nanometrics T120 Horizon. A benchtop prototype exhibits measured noise floors in the order of 82 pico-g/√Hz at 0.4 Hz in our laboratory.
We will present recent updates on this optomechanical accelerometer, including up to date measurements of the resonator and interferometer sensitivity, as well as that of the combined system.
