Quasi-monolithic heterodyne laser interferometer for inertial sensing
Instrumentation and Detectors
2022-09-29 v1 Applied Physics
Optics
Abstract
We present a compact heterodyne laser interferometer developed for high-sensitivity displacement sensing applications. This interferometer consists of customized prisms and waveplates assembled as a quasi-monolithic unit to realize a miniaturized system. The interferometer design adopts a common-mode rejection scheme to provide a high rejection ratio to common environmental noise. Experimental tests in vacuum show a displacement sensitivity level of 11 pm/rtHz at 100mHz, and as low as 0.6pm/rtHz above 1Hz. The prototype unit has a size of 20mm X 20mm X 10mm and weighs 4.5 grams, which allows subsequent integration into compact systems.
Cite
@article{arxiv.2209.04446,
title = {Quasi-monolithic heterodyne laser interferometer for inertial sensing},
author = {Yanqi Zhang and Felipe Guzman},
journal= {arXiv preprint arXiv:2209.04446},
year = {2022}
}