Influence of laser spot size at diffuser plane on the longitudinal spatial coherence function of optical coherence microscopy system
Coherence properties and wavelength of light sources are indispensable for optical coherence microscopy/tomography (OCM/T) as they greatly influence the signal to noise ratio, axial resolution, and penetration depth of the system. In the present letter, we investigated the longitudinal spatial coherence properties of pseudo/thermal light source (PTS) as a function of spot size at the diffuser plane, which is controlled by translating microscope objective lens towards or away from the diffuser plane. The axial resolution of PTS is found to be maximum ~ 13 µm for the beam spot size of 3.5 mm at the diffuser plane ...
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