Lesaffre M, Verrier N, Gross M
Institut Langevin: Unité Mixte de Recherche (UMR) 7587 Centre National de la Recherche Scientifique (CNRS), Ecole Supérieure de Physique et de Chimie Industrielle de Paris (ESPCI), ParisTech, 1 rue Jussieu, Paris 75005, France.
Appl Opt. 2013 Jan 1;52(1):A81-91. doi: 10.1364/AO.52.000A81.
We have performed off-axis heterodyne holography with very weak illumination by recording holograms of the object with and without object illumination in the same acquisition run. We have experimentally studied how the reconstructed image signal (with illumination) and noise background (without) scale with the holographic acquisition and reconstruction parameters that are the number of frames and the number of pixels of the reconstruction spatial filter. The first parameter is related to the frequency bandwidth of detection in time, the second one to the bandwidth in space. The signal to background ratio varies roughly like the inverse of the bandwidth in time and space. We have also compared the noise background with the theoretical shot-noise background calculated by Monte Carlo simulation. The experimental and Monte Carlo noise background agree very well with each other.
我们通过在同一次采集过程中记录有物体照明和无物体照明时的物体全息图，实现了在非常弱的照明条件下的离轴外差全息术。我们通过实验研究了重建图像信号（有照明）和噪声背景（无照明）如何随着全息采集和重建参数（即重建空间滤波器的帧数和像素数）而变化。第一个参数与时间上的检测频率带宽有关，第二个参数与空间上的带宽有关。信号与背景的比率大致随时间和空间带宽的倒数而变化。我们还将噪声背景与通过蒙特卡罗模拟计算出的理论散粒噪声背景进行了比较。实验噪声背景和蒙特卡罗噪声背景彼此非常吻合。
