Vortex mode transformation interferometry
Vortex mode transformation interferometry
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DOI：
10.1088/2040-8986/ab5c8d
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发表时间：
2020-01-01
影响因子：
2.1
通讯作者：
Geberbauer, J. W. T.
中科院分区：
文献类型：
--
作者：
Damzen, Michael J.;Kerridge-Johns, William R.;Geberbauer, J. W. T.
虽然存在许多产生光学涡旋的技术，但仍然需要新的设备和方法，以提供更高功率的涡旋产生，更大的波长灵活性，以及超越最低阶拉盖尔-高斯LG（01）模式的产生，以解决更广泛的实际应用。这项工作揭示了基于全反射镜的干涉模式转换系统如何提供这些特性，包括首次揭示了比以前认为的可能产生的更丰富的涡模式模式集。在不平衡Sagnac干涉仪上的实验证实了一个新的理论公式，该公式表明，所有阶的LaguerreGaussian LG（0l）模式都可以通过干涉变换转化为一组丰富的高质量高阶涡旋和涡旋叠加。干涉方法被证明是可配置的，以增加或减少涡度。新的数学公式提供了对Sagnac分束器（BS）端口的模式转换传输涡和互补反射光束进行全模态功率分析的能力。讨论了萨格纳克BS传递给涡旋输出的轨道角动量的来源。
Whilst many techniques exist for generation of an optical vortex, there remains a need for new devices and methods that can also provide vortex generation with higher powers, greater flexibility of wavelength, and generation beyond the lowest-order Laguerre-Gaussian LG(01) mode to address a broader range of practical applications. This work reveals how an all-mirror based interferometric mode transformation system can provide these properties including revealing, for the first time, the generation of a much richer set of vortex mode patterns than might have been thought possible previously. A new developed theoretical formulation, confirmed with excellent agreement by experimental demonstrations in an imbalanced Sagnac interferometer, shows interferometric transformation is possible for all orders of LaguerreGaussian LG(0l) modes into a rich set of high quality higher-order vortex and vortex superposition. The interferometric approach is shown to be configurable to increase or decrease vorticity. The new mathematical formulation provides the ability to perform a full modal power analysis of both the mode-transformed transmitted vortex and the complementary reflected beam at the Sagnac beamsplitter (BS) port. A discussion is made on the origin of the orbital angular momentum transferred to the vortex output from the Sagnac BS.