用于星间光通信中超高斯光束整形的衍射光学元件
Diffractive optical element for super-Gaussian beam shaping on intersatellite optical communications
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中文总结 AI 辅助
针对星间光通信链路指向抖动问题，采用Gerchberg–Saxton算法设计衍射光学元件生成超高斯光束，评估其制造与波前要求以提升链路性能。
中文摘要 AI 辅助
指向抖动会显著降低星间光通信链路的性能。本研究探究衍射光学光束整形作为生成超高斯分布的手段，以降低对发射机失准的敏感性。采用Gerchberg–Saxton相位恢复算法设计相位屏，并针对不同超高斯阶数进行评估：低阶分布可被精确复现，而高阶分布则日益受到数值离散化和有限孔径效应的限制。通过对径向制造分辨率、相位量化、相位深度误差及入射光束波前像差的敏感性分析，评估采用熔融石英衍射光学元件实现相位屏的实际应用，结果为维持所需光束形状提供了制造容差和波前质量要求。
英文摘要
Pointing jitter can significantly degrade the performance of intersatellite optical communication links. This work investigates diffractive optical beam shaping as a means of generating super-Gaussian profiles with reduced sensitivity to transmitter misalignment. Phase screens are designed using a Gerchberg--Saxton phase-retrieval algorithm and evaluated for different super-Gaussian orders. Lower-order profiles are reproduced accurately, whereas higher orders are increasingly limited by numerical discretization and finite-aperture effects. The practical implementation of the phase screens using fused-silica diffractive optical elements is assessed through sensitivity analyses of radial manufacturing resolution, phase quantization, phase-depth errors, and incident-beam wavefront aberrations. The results provide manufacturing tolerances and wavefront-quality requirements for preserving the desired beam shape.
