Working principle of miniaturized endoscopes (IMAGE)
Caption
a, Each fiber core exhibits a random phase delay, which adds to the in-coupled wave front and results in a high spatial frequency disturbance at the fiber output. b, phase distortions are compensated using a diffractive optical element (DOE). Focusing at the distal fiber side is performed by adding the phase structure of a Fresnel lens on the DOE at the proximal fiber side. c, Scheme and principle of a diffuser endoscope. The diffuser at the distal side codes the 3D object information into a 2D speckle pattern, which is transferred through the CFB to the proximal side. The 3D information is recovered in real time using a neural network.
Credit
by Robert Kuschmierz and Juergen W Czarske
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Credit must be given to the creator.
License
CC BY