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Expansion of the FOV in speckle autocorrelation imaging by spatial filtering

2019; Optica Publishing Group; Volume: 44; Issue: 24 Linguagem: Inglês

10.1364/ol.44.005997

1539-4794

Meijun Chen, Honglin Liu, Zhentao Liu, Puxiang Lai, Shensheng Han,

Optical Coherence Tomography Applications

Optical imaging through inhomogeneous media based on autocorrelations suffers from a limited field of view (FOV), since the optical memory effect (ME) of a scattering medium has its inherent angular extent. Here we successfully expand the angular ME range by exploiting a spatial filtering technique to select low-frequency components, mainly ballistic light and less scattered light, thereby increasing the FOV of the speckle autocorrelation imaging. Both a simulation and experimental verifications are presented. This technique, which is not limited to the discussed 4f structure, can provide a guideline for the design of an optical system to image through scattering media.