Demonstration of a photonic-lantern focal-plane wavefront sensor using fiber mode conversion and deep learning
Demonstration of a photonic-lantern focal-plane wavefront sensor using fiber mode conversion and deep learning
复制标题
使用光纤模式转换和深度学习演示光子灯笼焦平面波前传感器
DOI：
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
M. Fitzgerald
中科院分区：
文献类型：
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作者：
B. Norris;Jin Wei;C. Betters;S. Leon;Yinzi Xin;Jonathan Lin;Yoo Jung Kim;S. Sallum;J. Lozi;S. Vievard;O. Guyon;P. Gatkine;N. Jovanovic;D. Mawet;M. Fitzgerald
焦平面波前传感器为自适应光学提供了主要优势，包括消除非共路误差和提供对盲模（如花瓣）的灵敏度。但是，简单地使用观察到的点扩散函数（PSF）不足以进行波前校正，因为仅测量强度，而不是相位。在这里，我们演示了使用多模光纤模式转换器（光子灯笼）直接测量波前相位和振幅在焦平面。星光在像平面处注入多模光纤，光纤内激发的模式的组合是入射波前的相位和振幅的函数。光纤经历绝热转变为一组多个单模输出，使得它们之间的强度分布对入射波阵面进行编码。PSF中的空间模式与输出之间的映射（可能是强非线性的）是稳定的，但必须学习。这是由一个深度神经网络完成的，通过将空间模式的随机组合应用于可变形反射镜来训练。一旦被训练，神经网络可以即时预测任何输出强度集合的入射波前。我们证明了在实验室中产生的低风效应的波前的成功重建，以及与现有金字塔波前传感器测量的一致的低阶模式的重建的天空演示，使用SCExAO观测在斯巴鲁望远镜。
A focal plane wavefront sensor offers major advantages to adaptive optics, including removal of non-commonpath error and providing sensitivity to blind modes (such as petalling). But simply using the observed point spread function (PSF) is not sufficient for wavefront correction, as only the intensity, not phase, is measured. Here we demonstrate the use of a multimode fiber mode converter (photonic lantern) to directly measure the wavefront phase and amplitude at the focal plane. Starlight is injected into a multimode fiber at the image plane, with the combination of modes excited within the fiber a function of the phase and amplitude of the incident wavefront. The fiber undergoes an adiabatic transition into a set of multiple, single-mode outputs, such that the distribution of intensities between them encodes the incident wavefront. The mapping (which may be strongly non-linear) between spatial modes in the PSF and the outputs is stable but must be learned. This is done by a deep neural network, trained by applying random combinations of spatial modes to the deformable mirror. Once trained, the neural network can instantaneously predict the incident wavefront for any set of output intensities. We demonstrate the successful reconstruction of wavefronts produced in the laboratory with low-wind-effect, and an on-sky demonstration of reconstruction of low-order modes consistent with those measured by the existing pyramid wavefront sensor, using SCExAO observations at the Subaru Telescope.
用于衍射极限光谱测量的光子灯的设计考虑
DOI：
10.1364/josab.423664
发表时间：
2021
期刊：
Journal of the Optical Society of America B
影响因子：
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作者：
Lin, Jonathan;Jovanovic, Nemanja;Fitzgerald, Michael P.
通讯作者：
Fitzgerald, Michael P.
影响因子：
27.1
作者：
Birks, T. A.;Gris-Sanchez, I.;Thomson, R. R.
通讯作者：
Thomson, R. R.
使用光子灯进行系外行星探测，用于焦平面波前传感和控制
DOI：
10.1117/12.2630692
发表时间：
2022
期刊：
Adaptive Optics Systems VIII
影响因子：
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作者：
Lin, Jonathan;Xin, Yinzi;Norris, Barnaby R.;Kim, Yoo Jung;Sallum, Steph;Betters, Christopher;Leon-Saval, Sergio;Lozi, Julien;Vievard, Sebastian;Guyon, Olivier
通讯作者：
Guyon, Olivier