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Measurement of sub-fm/Hz^(1/2) displacement spectral densities in ultrahigh-Q single-crystal microcavities with hertz-level lasers

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Photonics Research 2022年第5期10卷 1202-1209页

作者： YOON-SOO JANG JINKANG LIM WENTING WANG SEUNG-WOO KIM anatoliy savchenkov ANDREY BMATSKO CHEE WEI WONG Fang Lu Mesoscopic Optics and Quantum Electronics Laboratory University of CaliforniaLos AngelesCalifornia 90095USA Division of Physical Metrology Korea Research Institute of Standards and Science(KRISS)Daejeon 34113Republic of Korea CACI-LGS Labs Florham ParkNew Jersey 07932USA Department of Mechanical Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea OEwaves Inc. PasadenaCalifornia 91107USA Jet Propulsion Laboratory California Institute of TechnologyPasadenaCalifornia 91109USA

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 *** 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 *** 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 *** 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.

关键词： synchronization displacement cavity

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Probing 10μK stability and residual drifts in the cross-polarized dual-mode stabilization of single-crystal ultrahigh-Q optical resonators

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Light(Science & Applications) 2019年第1期8卷 1170-1178页

作者： Jinkang Lim Wei Liang anatoliy A.savchenkov Andrey B.Matsko Lute Maleki Chee Wei Wong Fang Lu Mesoscopic Optics and Quantum Electronics Laboratory University of CaliforniaLos AngelesCA 90095USA OEwaves Inc. 465 North Halstead StreetSuite 140PasadenaCA 91107USA

The thermal stability of monolithic optical microresonators is essential for many mesoscopic photonic applications such as ultrastable laser oscillators,photonic microwave clocks,and precision navigation and *** fundamental performance is largely bounded by thermal *** thermal monitoring can be achieved by utilizing cross-polarized dual-mode beat frequency metrology,determined by the polarization-dependent thermorefractivity of a single-crystal microresonator,wherein the heterodyne radio-frequency beat pins down the optical mode volume temperature for precision ***,we investigate the correlation between the dualmode beat frequency and the resonator temperature with time and the associated spectral noise of the dual-mode beat frequency in a single-crystal ultrahigh-Q MgF_(2) resonator to illustrate that dual-mode frequency metrology can potentially be utilized for resonator temperature stabilization reaching the fundamental thermal noise limit in a realistic *** show a resonator long-term temperature stability of 8.53μK after stabilization and unveil various sources that hinder the stability from reaching sub-μK in the current system,an important step towards compact precision navigation,sensing,and frequency reference architectures.

关键词： resonator polarization stabilization

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