Abstract
Recently, there has been a surge in reports of so-called ‘lensless endoscopes’, a term which denotes the active control of the fiber injected wavefront from the proximal side only to enable imaging without any distal optics, thus allowing the miniaturization of the endoscope to the fundamental limit, the size of the optical fiber itself. Our approach sets itself apart in several ways: (i) the capability to perform nonlinear image contrast using two-photon fluorescence; and (ii) high image acquisition rates and (iii) the active control of the distal focused spot while bending the fiber. We have developed a multicore fiber (MCF) specifically for our approach. It consists of 169 homogeneous single-mode cores, each of which functions as one ‘pixel’ of the wave front. These fiber cores are spatially arranged in an aperiodic pattern to eliminate the satellite grating induced repliqua and to extend the field of view.
© 2019 IEEE
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