AI 中文总结
研究部分相干光束在传播中保持轨道角动量的难题，提出通过光学共形映射产生具有确定性涡旋结构的径向相关部分相干光束，其独特相干分布能支持涡旋相位，为光束设计提供新见解，助力相关应用发展。
AI 中文摘要
部分相干光束因其对复杂环境扰动的固有抗性而备受关注。然而，其固有波前波动使得在传播过程中保持明确的轨道角动量具有根本挑战性。在这项工作中，我们提出并通过实验证明了一类通过从笛卡尔坐标到对数极坐标的光学共形映射产生的具有确定性涡旋结构的径向相关部分相干光束。所得光束呈现环形相干分布，径向低相干，方位角高相干。这种独特特性支持明确的确定性涡旋相位，使光束在通过聚焦系统传播时能保持环形相干分布。我们的结果为新型部分相干光束的设计提供了新见解，可能促进光学编码、自由空间信息传输和超快光与物质相互作用等应用的发展。
英文摘要
Partially coherent beams have attracted considerable attention due to their intrinsic resilience against complex environmental perturbations. However, the intrinsic wavefront fluctuations make it fundamentally challenging to preserve well-defined orbital angular momentum during propagation. In this work, we propose and experimentally demonstrate a class of radially correlated, partially coherent beams that carry deterministic vortex structures, generated via optical conformal mapping from Cartesian to log-polar coordinates. The resulting beams exhibit a ring-shaped coherence distribution, characterized by low coherence in the radial direction and high coherence in the azimuthal direction. This unique feature of such a beam supports a well-defined deterministic vortex phase, thereby enabling the beam to preserve its ring-shaped coherence distribution during propagation through a focusing system. Our results provide new insights into the design of new partially coherent beams and may facilitate the development of applications in optical encoding, free-space information transmission, and ultrafast light-matter interactions.
