Further improvements to iterative off-axis digital holography
Further improvements to iterative off-axis digital holography
复制标题
迭代离轴数字全息术的进一步改进
DOI：
10.1364/oe.425150
复制
发表时间：
2021
期刊：
影响因子：
3.8
通讯作者：
Jianqiang Zhu
中科院分区：
文献类型：
--
作者：
He Siyuan;Xingchen Pan;Cheng Liu;Jianqiang Zhu
为了突破离轴全息术在测量粗糙或强散射物体时的局限性，提出了一种基于波前编码概念的迭代算法。该方法将参考光看作一个波调制器，从传统离轴全息的随机猜测出发。在充分利用检测器的空间带宽后，可以迭代地恢复全频谱。作为相干衍射成像的一种形式，其理论分辨率是衍射极限。通过对随机相位板的仿真和实验表明，当目标频谱太宽而无法用传统离轴全息和迭代离轴全息算法进行重建时，该算法能够很好地实现目标的重建。该算法可以显著提高离轴全息术测量粗糙或强散射物体的能力。
In order to break through the limitation of off-axis holography in the field of measuring rough or strong scattering objects, a new iterative algorithm based on the concept of wavefront-coding was proposed. The reference wave is regarded as a wave modulator and it starts with random guess freed from the result of traditional off-axis holography. The full frequency spectrum could be retrieved iteratively after taking full advantage of the space-bandwidth production of the detector. As one form of coherent diffractive imaging, the theoretical resolution is diffraction limitation. According to the simulations and experiments with random phase plate, when the object fails to be reconstructed by traditional off-axis holography and other iterative off-axis holography algorithm due to the frequency spectrum of object is too wide, the proposed algorithm works well. It could be a general algorithm to prominently improve the capability of off-axis holography to measure rough or strong scattering objects.