期刊
PHOTONICS RESEARCH
卷 10, 期 5, 页码 1202-1209出版社
CHINESE LASER PRESS
DOI: 10.1364/PRJ.449782
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资金
- National Science Foundation [1741707, 1936375]
- NASA
- Korea Research Institute of Standards and Science [22011042, 22011230]
- National Research Foundation of the Republic of Korea [NRF2012R1A3A1050386]
- National Aeronautics and Space Administration [80NM0018D0004]
- OEwaves
- Direct For Mathematical & Physical Scien
- MPS Multidisciplinary Activities [1936375] Funding Source: National Science Foundation
- Emerging Frontiers & Multidisciplinary Activities
- Directorate For Engineering [1741707] Funding Source: National Science Foundation
The importance and method of subpicometer displacement measurements of a high Q optical cavity using PDH locking scheme for minute displacement measurements.
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 MgF2 whispering-gallery-mode microcavity by frequency synchronization between a 1 Hz cavity-stabilized laser and a resonance of the MgF2 cavity using PDH laser-cavity locking. We characterize not only the displacement spectral density of the microcavity with a sensitivity of 1.5 x 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. (C) 2022 Chinese Laser Press
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