Incorporation of a metasurface that involves spin-orbit interaction phenomenon into a laser cavity provides a route to the generation of spin-controlled intracavity modes with different topologies. By utilizing the geometric phase, Pancharatnam-Berry phase, we found a spin-enabled self-consistent cavity solution of a Nd:YAG laser with a silicon-based metasurface. Using this solution we generated a laser mode possessing spin-controlled orbital-angular momentum. Moreover, an experimental demonstration of a vectorial vortex is achieved by the coherent superposition of modes with opposite spin and orbital angular momenta. We experimentally achieved a high mode purity of ∼95% due to laser mode competition and purification. The photonic spin-orbit interaction mechanism within a laser-cavity can be implemented with multifunctional shared-aperture nanoantenna arrays to achieve multiple intracavity topologies.

中文翻译：

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基于Pancharatnam-Berry相的拓扑控制腔内激光模式

将涉及自旋轨道相互作用现象的超表面结合到激光腔中，为生成具有不同拓扑结构的自旋控制腔内模提供了一条途径。通过利用几何相Pancharatnam-Berry相，我们发现了具有硅基超表面的Nd：YAG激光器的自旋使能自洽腔解决方案。使用此解决方案，我们生成了具有自旋控制的轨道角动量的激光模式。此外，通过具有相反的自旋和轨道角动量的模式的相干叠加，可以实现矢量涡旋的实验演示。由于激光模式的竞争和纯化，我们通过实验获得了约95％的高模式纯度。