Tenner Vasco T, Eikema Kjeld S E, Witte Stefan
Opt Express. 2014 Oct 20;22(21):25397-409. doi: 10.1364/OE.22.025397.
We demonstrate a technique that enables lensless holographic imaging with extended reference structures, using ultra-broadband radiation sources for illumination. We show that this 'two-pulse imaging' approach works with one- and two-dimensional HERALDO reference structures, and demonstrate that the obtained spectrally resolved data can be used to improve the signal-to-noise ratio in the final image. Intensity stitching of multiple exposures is applied to increase the detected dynamic range, leading to an improved image reconstruction. Furthermore, we show that a combination of holography and iterative phase retrieval can be used to obtain high-quality images quickly and reliably, by using the HERALDO reconstruction as the initial support constraint in the iterative phase retrieval algorithm. A signal-to-noise improvement of two orders of magnitude is achieved compared to the basic HERALDO result.
我们展示了一种技术，该技术利用超宽带辐射源进行照明，实现了具有扩展参考结构的无透镜全息成像。我们表明，这种“双脉冲成像”方法适用于一维和二维HERALDO参考结构，并证明所获得的光谱分辨数据可用于提高最终图像的信噪比。应用多次曝光的强度拼接来增加检测到的动态范围，从而改进图像重建。此外，我们表明，通过在迭代相位检索算法中使用HERALDO重建作为初始支持约束，全息术和迭代相位检索的组合可用于快速可靠地获得高质量图像。与基本的HERALDO结果相比，信噪比提高了两个数量级。
