PERFORMANCES OF ENDOSCOPIC HOLOGRAPHY WITH A MULTICORE OPTICAL-FIBER

A holographic setup that involves the use of a multicore optical fiber as an in situ recording medium has been developed. The hologram is tr ansmitted to a CCD camera for electronic processing, and the image is reconstructed numerically, providing more flexibility to the holograph ic process. The performances of this imaging system have been evaluate d in terms of the resolution limit and robustness relative to noise. T he experimental cutoff frequency has been measured experimentally over a range of observation distances (4-10 mm) and presents a very good a greement with the predictions made by simulation. The system features a resolution of 5-mu m objects for a 4-mm observation distance. The di fferent sources of noise have been analyzed, and their influence on re solution has been proved to be nonrelevant. (C) 1995 Optical Society o f America.