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arXiv 1901.08217physics.opticsphysics.app-ph
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光学陀螺仪在异常点附近的增强灵敏度操作

Enhanced sensitivity operation of an optical gyroscope near an exceptional point

Yu-Hung Lai, Yu-Kun Lu, Myoung-Gyun Suh, Kerry Vahala

摘要:

例外点(EPs)是控制开放系统动力学的非厄米特哈密顿量的特殊谱简并。在EP处,两个或多个本征值和对应的本征态合并。最近,已经提出EP可以提高光学陀螺仪的灵敏度。在这里,我们报告的测量旋转灵敏度提高了超过4倍,这是由于基于芯片的受激布里渊陀螺仪在异常点附近的操作。二阶EP被确定在陀螺仪中,起源于顺时针和逆时针激光模式之间的耗散耦合。的模式下的应用程序的旋转经验相反的Sagnac移位,但附近的例外点新的模式混合物显着增加的Sagnac移位。建模证实了测量的增强。这一结果不仅可以提高光学陀螺的灵敏度,而且为研究非厄米物理和精确控制的非线性光学提供了一个新的平台。

英文摘要:

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.

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