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Enhanced sensitivity operation of an optical gyroscope near an exceptional point

Lai, Yu-Hung and Lu, Yu-Kun and Suh, Myoung-Gyun and Vahala, Kerry (2019) Enhanced sensitivity operation of an optical gyroscope near an exceptional point. . (Unpublished)

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Exceptional points (EPs) are special spectral degeneracies of non-Hermitian Hamiltonians governing the dynamics of open systems. At the EP two or more eigenvalues and the corresponding eigenstates coalesce. Recently, it has been proposed that EPs can enhance the sensitivity of optical gyroscopes. Here we report measurement of rotation sensitivity boost by over 4X resulting from operation of a chip-based stimulated Brillouin gyroscope near an exceptional point. A second-order EP is identified in the gyroscope and originates from the dissipative coupling between the clockwise and counterclockwise lasing modes. The modes experience opposing Sagnac shifts under application of a rotation, but near the exceptional point new modal admixtures dramatically increase the Sagnac shift. Modeling confirms the measured enhancement. Besides the ability to operate an optical gyroscope with enhanced sensitivity, this result provides a new platform for study of non-Hermitian physics and nonlinear optics with precise control.

Item Type:Report or Paper (Discussion Paper)
Related URLs:
URLURL TypeDescription Paper
Suh, Myoung-Gyun0000-0002-9527-0585
Vahala, Kerry0000-0003-1783-1380
Additional Information:We thank Mercedeh Khajavikhan, Demetrios Christodoulides, Or Peleg, and Barry Loevsky for the helpful discussions in preparing this manuscript. We also thank Boqiang Shen, Chengying Bao, and Qifan Yang for technical support. This project was supported by the Defense Advanced Research Projects Agency (DARPA) through SPAWAR (N66001-16-1-4046) and the Kavli Nanoscience Institute. Author Contributions: Y.-K. L., Y.-H. L., M.-G. S. and K. V. conceived the exceptional point enhancement in the offset-counter-pumped stimulated Brillouin laser gyroscope. Y.-K. L., Y.-H. L. and K.V. constructed the theoretical model. M.-G. S. fabricated the ultra-high-Q silica microresonator and help Y.-H. L. with the packaging. Y.-H. L. and Y.-K. L. performed the experiment. All authors analyzed the data and wrote the manuscript.
Group:Kavli Nanoscience Institute
Funding AgencyGrant Number
Office of Naval Research (ONR)N66001-16-1-4046
Defense Advanced Research Projects Agency (DARPA)UNSPECIFIED
Kavli Nanoscience InstituteUNSPECIFIED
Record Number:CaltechAUTHORS:20190429-082730110
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:95064
Deposited By: Tony Diaz
Deposited On:29 Apr 2019 15:51
Last Modified:29 Apr 2019 15:51

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