Direct wavefront sensing from extended objects: a general sensor

Direct wavefront sensing from extended objects: a general sensor
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来自扩展物体的直接波前传感:通用传感器

DOI:
10.1117/1.oe.60.7.073107
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发表时间:
2021-01
影响因子:
1.3
通讯作者:
Zhang Sijiong
Zhang Sijiong
中科院分区:
工程技术4区
文献类型:
--
作者:
Li Changwei;Lu Yanting;Zhang Sijiong

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抽象的。从扩展对象检测波前是一项具有挑战性的任务,因为要检测的相位受到从扩展对象的结构产生的相位的干扰。针对这一问题,提出了一种通用的波前传感器。该传感器由一个场镜、一个准直透镜、一个小透镜阵列和一个摄像机组成。场透镜是该传感器的第一个元件,它确保每个小透镜收集扩展对象的相同信息,这是使用所提出的传感器从扩展对象重建变形波前的基础。传感器的基本策略是通过消除扩展目标在频域中的傅里叶空间谱,将扩展目标的波前探测场景转换为传统的点源探测场景。结果表明,利用Shack-Hartmann波前传感器的算法可以重建出失真的波前。数值模拟和实验都验证了所提出的传感器用于从任何类型的扩展目标直接探测波前的可行性和准确性。
Abstract. Wavefront sensing from an extended object is a challenging task since the phase to be sensed is disturbed by the one generated from the structure of the extended object. To address this problem, a general wavefront sensor is proposed. The configuration of the proposed sensor consists of a field lens, a collimating lens, a lenslet array, and a camera. The field lens, the first element of this sensor, ensures that each lenslet collects the same information of the extended object, which is a basis for the reconstruction of the distorted wavefront from the extended object using the proposed sensor. The fundamental strategy of the sensor is converting the scenario of wavefront sensing from an extended object into the traditional one from a point source by eliminating the Fourier spatial spectrum of the extended object in the frequency domain. As a result, the distorted wavefront can be reconstructed using the algorithm of the Shack–Hartmann wavefront sensor. Numerical simulations and experiments both verify the feasibility and accuracy of the proposed sensor for direct wavefront sensing from any types of extended objects.
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