1. Comparison of different focusing systems for common-path optical coherence tomography with fiber-optic bundle as endoscopic probe

    A fiber-optic bundle–based submillimeter probe for endoscopic common-path optical coherence tomography with focusing system is presented. Three different focusing systems, bulk lenses, a gradient index (GRIN) lens, and a microlens array, are proposed and compared. The simulation results show that all the focusing systems can focus the beam with different degrees of effectiveness. The major differences between the different focusing systems exist in the beam size and the divergence angle between the inner and outer pixels of the fiber bundle. The microlens array shows the smallest change in beam size from the central fiber to the outermost fiber, while ...

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