Surpassing digital holography limits by lensless object scanning holography

被引：50
作者：
Mico, Vicente [1 ]
Ferreira, Carlos [1 ]
Garcia, Javier [1 ]
机构：
[1] Univ Valencia, Dept Opt, E-46100 Burjassot, Spain
来源：
OPTICS EXPRESS | 2012年 / 20卷 / 09期
关键词：
VOLUME-SPECKLE FIELD; SYNTHETIC-APERTURE; INTERFEROMETRIC MICROSCOPY; FOURIER HOLOGRAPHY; NOISE-REDUCTION; PHASE RETRIEVAL; HIGH-RESOLUTION; IMAGING METHOD; WIDE-FIELD; SUPERRESOLUTION;
D O I：
10.1364/OE.20.009382
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We present lensless object scanning holography (LOSH) as a fully lensless method, capable of improving image quality in reflective digital Fourier holography, by means of an extremely simplified experimental setup. LOSH is based on the recording and digital post-processing of a set of digital lensless holograms and results in a synthetic image with improved resolution, field of view (FOV), signal-to-noise ratio (SNR), and depth of field (DOF). The superresolution (SR) effect arises from the generation of a synthetic aperture (SA) based on the linear movement of the inspected object. The same scanning principle enlarges the object FOV. SNR enhancement is achieved by speckle suppression and coherent artifacts averaging due to the coherent addition of the multiple partially overlapping bandpass images. And DOF extension is performed by digital refocusing to different object's sections. Experimental results showing an impressive image quality improvement are reported for a one-dimensional reflective resolution test target. (C) 2012 Optical Society of America
引用
收藏
页码：9382 / 9395
页数：14
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