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- Title
Investigation and Mitigation of Noise Contributions in a Compact Heterodyne Interferometer.
- Authors
Zhang, Yanqi; Hines, Adam S.; Valdes, Guillermo; Guzman, Felipe
- Abstract
We present a noise estimation and subtraction algorithm capable of increasing the sensitivity of heterodyne laser interferometers by one order of magnitude. The heterodyne interferometer is specially designed for dynamic measurements of a test mass in the application of sub-Hz inertial sensing. A noise floor of 3.31 × 10 − 11 m / Hz at 100 m Hz is achieved after applying our noise subtraction algorithm to a benchtop prototype interferometer that showed a noise level of 2.76 × 10 − 10 m / Hz at 100 m Hz when tested in vacuum at levels of 3 × 10 − 5 Torr. Based on the previous results, we investigated noise estimation and subtraction techniques of non-linear optical pathlength noise, laser frequency noise, and temperature fluctuations in heterodyne laser interferometers. For each noise source, we identified its contribution and removed it from the measurement by linear fitting or a spectral analysis algorithm. The noise correction algorithm we present in this article can be generally applied to heterodyne laser interferometers.
- Subjects
NONLINEAR optical techniques; INTERFEROMETERS; NOISE; LASER interferometers; DYNAMIC testing; ALGORITHMS
- Publication
Sensors (14248220), 2021, Vol 21, Issue 17, p5788
- ISSN
1424-8220
- Publication type
Article
- DOI
10.3390/s21175788