Memmolo Pasquale, Bianco Vittorio, Paturzo Melania, Javidi Bahram, Netti Paolo A, Ferraro Pietro
Opt Express. 2014 Oct 20;22(21):25768-75. doi: 10.1364/OE.22.025768.
In digital holography (DH) a mixture of speckle and incoherent additive noise, which appears in numerical as well as in optical reconstruction, typically degrades the information of the object wavefront. Several methods have been proposed in order to suppress the noise contributions during recording or even during the reconstruction steps. Many of them are based on the incoherent combination of multiple holographic reconstructions achieving remarkable improvement, but only in the numerical reconstruction i.e. visualization on a pc monitor. So far, it has not been shown the direct synthesis of a digital hologram which provides the denoised optical reconstruction. Here, we propose a new effective method for encoding in a single complex wavefront the contribution of multiple incoherent reconstructions, thus allowing to obtain a single synthetic digital hologram that show significant speckle-reduction when optically projected by a Spatial Light Modulator (SLM).
在数字全息术（DH）中，散斑和非相干加性噪声的混合出现在数值重建以及光学重建中，通常会降低物波前的信息。为了在记录甚至重建步骤中抑制噪声影响，已经提出了几种方法。其中许多方法基于多个全息重建的非相干组合，取得了显著的改进，但仅在数值重建中，即在计算机显示器上的可视化方面。到目前为止，尚未展示出能提供去噪光学重建的数字全息图的直接合成。在此，我们提出一种新的有效方法，用于在单个复波前中编码多个非相干重建的贡献，从而能够获得单个合成数字全息图，当通过空间光调制器（SLM）进行光学投影时，该全息图显示出显著的散斑减少。
