Fig. 2.

(a) A photograph of and (b) the schematic of OCT imaging probe tip. This probe features an angle cut gradient index (GRIN) lens and a rod mirror both 1 mm in diameter, secured in a 7-mm-long stainless steel metal housing that is soldered to the stainless torque coil for protection of the optical components. A single mode SMF-28 fiber inside the torque coil is used to carry the laser beam and the length of spacer determines the working distance of the probe. The maximum diameter of the imaging probe is 1.47 mm.