An effective approach for reconstructing on-axis lensless Fourier Transform digital hologram by using the screen division method is proposed. Firstly, the on-axis Fourier Transform digital hologram is divided into sub-holograms. Then the reconstruction result of every sub-hologram is obtained according to the position of corresponding sub-hologram in the hologram reconstruction plane with Fourier transform operation. Finally, the reconstruction image of on-axis Fourier Transform digital hologram can be acquired by the superposition of the reconstruction result of sub-holograms. Compared with the traditional reconstruction method with the phase shifting technology, in which multiple digital holograms are required to record for obtaining the reconstruction image, this method can obtain the reconstruction image with only one digital hologram and therefore greatly simplify the recording and reconstruction process of on-axis lensless Fourier Transform digital holography. The effectiveness of the proposed method is well proved with the experimental results and it will have potential application foreground in the holographic measurement and display field.
In order to measure the three-dimensional microstructure of surface defects on optical component, a novel measuring method based on digital image-plane holographic microscopy (DIPHM) is proposed in this paper. The experimental system has been designed and built to measure the microstructure of optical component’s surface defects. The object light wavefront can be reconstructed by using the algorithm based on the angular spectrum theory, and the technique of phase correction is contributive to eliminate the system error. There is a definite relationship between the object light wavefront and the surface topography, so the 3D microstructure of surface defects can be measured. This measuring technique is helpful to judge the damage degree of the optical component and analysis the influence of the surface defects, and it is of great significance to ensure the laser system security running.
In order to measure the three-dimensional microstructure of surface defects on optical component, a novel measuring method based on digital image-plane holographic microscopy (DIPHM) is proposed in this paper. The experimental system has been designed and built to measure the microstructure of optical component’s surface defects. The object light wavefront can be reconstructed by using the algorithm based on the angular spectrum theory, and the technique of phase correction is contributive to eliminate the system error. There is a definite relationship between the object light wavefront and the surface topography, so the 3D microstructure of surface defects can be measured. This measuring technique is helpful to judge the damage degree of the optical component and analysis the influence of the surface defects, and it is of great significance to ensure the laser system security running.
In this paper, a method which can effectively achieve the accurate estimation of the focusing reconstruction distance of recorded object in digital holography (DH) is proposed. By analyzing the variance variety of the reconstructed intensity images corresponding to different reconstruction distances, the accurate focusing reconstruction distance of the recorded object is obtained and thus the legible reconstructed image in-focus is acquired. The effectiveness of the proposed method is successfully validated with both pure phase objects and pure amplitude objects in experiment. This method will have great potential application foreword in digital holographic measurement field.
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