Affiliation:
1. University of California
2. Korea Research Institute of Standards and Science
3. Korea Advanced Institute of Science and Technology
4. California Institute of Technology
Abstract
Tracing a resonance frequency of a high quality factor (Q) optical cavity facilitates subpicometer displacement measurements of the optical cavity via Pound–Drever–Hall (PDH) locking scheme, tightly synchronizing a laser frequency to the optical cavity. Here we present observations of subfemtometer displacements on a ultrahigh-Q single-crystal
MgF
2
whispering-gallery-mode microcavity by frequency synchronization between a 1 Hz cavity-stabilized laser and a resonance of the
MgF
2
cavity using PDH laser-cavity locking. We characterize not only the displacement spectral density of the microcavity with a sensitivity of
1.5
×
10
−
16
m
/
Hz
1
/
2
over the Fourier offset frequency ranging from 15 mHz to 100 kHz but also a 1.77 nm displacement fluctuation of the microcavity over 4500 s. Such measurement capability not only supports the analysis of integrated thermodynamical and technical cavity noise but allows for minute displacement measurements using laser-cavity locking for ultraprecise positioning, metrology, and sensing.
Funder
National Science Foundation
NASA
OEwaves
Korea Research Institute of Standards and Science
National Research Foundation of the Republic of Korea
National Aeronautics and Space Administration
Subject
Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials
Cited by
4 articles.
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