Xu Xianfeng, Zhang Zhiwei, Wang Zecheng, Wang Jing, Zhan Kaiyun, Jia Yulei, Jiao Zhiyong
Appl Opt. 2018 Mar 1;57(7):B205-B211. doi: 10.1364/AO.57.00B205.
A robust digital holography recording design is presented to complete the work of switching between in-line and off-axis recording methods. We precisely supervise the off-axis angle in off-axis holography, so that the original reconstructed image can be separated by a minimum off-axis angle. In the design, we can also monitor and remove the negative effects of the reference tilt error in phase-shifting digital holography. Compared with the conventional digital holographic recording configuration, a supervising unit is introduced to control and to monitor the angle between the reference beam and object beam. By the Fourier analysis on the interferograms recorded by the supervising unit and using the corresponding equations, the off-axis angle, which is crucial to reset the object image in holographic reconstruction, can be calculated accurately and then chosen for the best recording angle. For in-line holography, the error affecting the slight tilt of the reference beam on the retrieved object wavefront can be eliminated completely because the tilt angle is detected by another independent device. Furthermore, by using this advanced design, the experimental arrangement can be transformed flexibly from the in-line recording state to the off-axis state or from the latter one to the former without rebuilding the experimental setup. The availability and effectiveness of this design are verified by a series of experiments.
提出了一种稳健的数字全息记录设计，以完成同轴和离轴记录方法之间的切换工作。我们在离轴全息术中精确监控离轴角度，以便原始重建图像能够以最小离轴角度分离。在该设计中，我们还可以监测并消除相移数字全息术中参考倾斜误差的负面影响。与传统数字全息记录配置相比，引入了一个监控单元来控制和监测参考光束与物光束之间的角度。通过对监控单元记录的干涉图进行傅里叶分析并使用相应方程，可以准确计算出对全息重建中重置物体图像至关重要的离轴角度，然后选择最佳记录角度。对于同轴全息术，由于倾斜角度由另一个独立设备检测，因此可以完全消除影响检索到的物体波前上参考光束轻微倾斜的误差。此外，通过使用这种先进设计，实验装置可以在不重建实验设置 的情况下灵活地从同轴记录状态转换为离轴状态，或从离轴状态转换为同轴状态。一系列实验验证了该设计的可用性和有效性。
