Study on the digital phase hologram and its wavefront reconstruction

Abstract

Based on the traditional basic theory for the making of the phase hologram, the digital phase hologram is studied in this paper. The experimental results demonstrated that, in the forming of digital phase type hologram, there exists a constituent parameter that corresponds to the exposure time of the traditional phase type recorded by holographic plate.By choosing the proper constituent parameter, the object wave field can also be reconstructed from the digital phase hologram. In this paper, the forming of the digital phase hologram and how to choose the constituent parameter are presented, finally, the comparison between the digital amplitude holography and digital phase holography in theory simulation under the same condition and the experiment verification are given out.

Modulating Phase Encoding With Amplitude Compensation for Hologram Reconstruction

“…Figure 4 displays the curves along the x-axis of the reconstructed images (b), (c), and (d) from Figure 3. It is evident that the reconstructed images using the coding method referenced in [12,13] exhibit amplitude distortion. In contrast, the enhanced coding method more effectively eliminates this distortion, resulting in higher quality reconstructed images.…”

“…In contrast, the enhanced coding method more effectively eliminates this distortion, resulting in higher quality reconstructed images. [12]. (b) The method in [13].…”

“…(b) The method in [13]. (c) The method in this article It is easy to observe from the image of the Bessel function 𝐽 1 (𝛼) that if a smaller constituent parameter g is chosen at the cost of reducing the intensity of the reconstructed image, the encoding methods in [12] and [13] can also reconstruct images with smaller amplitude distortion. To confirm this analysis, let the constituent parameters determined in (16) be 𝑔 𝑚𝑎𝑥 , and 𝑔 = 0.2𝑔 𝑚𝑎𝑥 , 0.4𝑔 𝑚𝑎𝑥 , 0.6𝑔 𝑚𝑎𝑥 , 0.8𝑔 𝑚𝑎𝑥 , 1.0𝑔 𝑚𝑎𝑥 .…”

“…Figure 5 shows the axial direction amplitude distribution curves of the reconstructed images using the three methods (each curve from bottom to top corresponds to the added value of g). The method in [12]. (b) The method in [13].…”

“…However, in phase holograms, the amplitude is regarded as a constant, retaining only the phase information of the object light and not completely preserving all object light information. Based on the basic theory of traditional phase holograms [11], we proposed a method to transform holographic interference intensity into a digital hologram with modulating phase encoding [12]. Theoretical and experimental research shows that this method can reconstruct images with both object amplitude and phase information.…”