Spatial spectrum of coherence signal for a defocused object images in digital holographic microscopy with partially spatially coherent illumination
Klychkova D.M., Ryabukho V.P.

 

Institute of Precision Mechanics and Control of the Russian Academy of Sciences, Saratov, Russia

Saratov State University, Saratov, Russia

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Abstract:
We study the effect of a decrease in the magnitude of the coherence signal in high-frequency spatial spectrum for a defocused object image in transmission digital holographic microscopy with quasimonochromatic partially spatially coherent illumination. A theoretical description and results of the numerical simulation of the effect for a point scattering object are presented. The effect is experimentally studied by illuminating layered quasi-point scatterers with partially spatially coherent laser light obtained using a moving scatterer. The comparison of the experimental and theory-based numerical results shows them to be in good agreement.

Keywords:
interference microscopy, digital holographic microscopy, imaging, numerical focusing, spatial spectrum of hologram, partial coherence, partially spatially coherent illumination.

Citation:
Klychkova DM, Ryabukho VP. Spatial spectrum of coherence signal for a defocused object images in digital holographic microscopy with partially spatially coherent illumination. Computer Optics 2018; 42(3): 414-423. DOI: 10.18287/2412-6179-2018-42-3-414-423.

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