Using a short multimode fiber (SMMF) imaging probe with a diameter of 125 μ m and a length of 7.4 mm, the full-field optical coherence microscopy (FF OCM) to measure sectional images of in vivo rat brains deeper than 4 mm have been reported (Sato, 2019). However, since the tip of the SMMF was as cut, the process should be studied for smooth insertions into tissues and appropriate contacts to tissues. The SMMF processing conditions using electric discharge and the optical characteristics of the processed SMMF were investigated. Using a high voltage of 12,000 V for discharge duration of 11 s, the fiber tips of SMMF were processed to fabricate a spherical shape with a 77 μ m curvature radius. The measured imaging conditions approximate the optical model calculations of the parabolic refractive index and the spherical surface. Local blur and distortions in the measured images were identified in detail. Using the processed SMMF with a length of 7.35 mm and a diameter of 125 μ m , the transmission image of a chicken tendon samples closely corresponded to the image recorded with an optical microscope.
