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arXiv 2104.13892physics.optics
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克尔偏振控制器

A Kerr Polarization Controller

Niall Moroney, Leonardo Del Bino, Shuangyou Zhang, Michael T. M. Woodley, Lewis Hill, Thibault Wildi, Valentin J. Wittwer, Thomas Südmeyer, Gian-Luca Oppo, Mich… 展开作者

Niall Moroney, Leonardo Del Bino, Shuangyou Zhang, Michael T. M. Woodley, Lewis Hill, Thibault Wildi, Valentin J. Wittwer, Thomas Südmeyer, Gian-Luca Oppo, Michael. R. Vanner, Victor Brasch, Tobias Herr, Pascal Del'Haye

摘要:

在脉冲激光系统中,克尔效应引起的光偏振态的变化是众所周知的。一个例子是非线性偏振旋转,这对许多类型的锁模激光器的操作至关重要。在这里,我们证明了克尔效应在高精细法布里-珀罗谐振腔可以用来控制连续波激光器的偏振。结果表明,线偏振输入场被转换成左或右圆偏振场,通过光功率控制。观测结果解释克尔非线性引起的对称性破缺,分裂的谐振频率的简并模式相反的偏振旋向性,否则对称的谐振器。全光偏振控制的阈值功率下降到7 mW。这种基于克尔效应的偏振控制器的物理原理对于高Q克尔非线性谐振器是通用的,并且也可以在光子集成电路中实现。除了偏振控制之外,偏振态的自发对称性破缺可用于偏振滤波器或在接近破缺点操作时的高灵敏度偏振传感器。

英文摘要:

Kerr-effect-induced changes of the polarization state of light are well known in pulsed laser systems. An example is nonlinear polarization rotation, which is critical to the operation of many types of mode-locked lasers. Here, we demonstrate that the Kerr effect in a high-finesse Fabry-Pérot resonator can be utilized to control the polarization of a continuous wave laser. It is shown that a linearly-polarized input field is converted into a left- or right-circularly-polarized field, controlled via the optical power. The observations are explained by Kerr-nonlinearity induced symmetry breaking, which splits the resonance frequencies of degenerate modes with opposite polarization handedness in an otherwise symmetric resonator. The all-optical polarization control is demonstrated at threshold powers down to 7 mW. The physical principle of such Kerr effect-based polarization controllers is generic to high-Q Kerr-nonlinear resonators and could also be implemented in photonic integrated circuits. Beyond polarization control, the spontaneous symmetry breaking of polarization states could be used for polarization filters or highly sensitive polarization sensors when operated close to the symmetry-breaking point.

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