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23 February 2010Common-path optical frequency domain imaging system designed for identifying and grading pearls
We present a common-path optical frequency domain imaging (CP-OFDI) system for non-invasive evaluation of various
pearls. By adopting a high speed ready-to-ship scanning light source and a common-path lensed fiber probe, with the
help of a rotation stage, real-time display of whole circumference of a pearl could be achieved. The common-path lensed
fiber probe was fabricated by simply forming a focusing lens directly on the tip of an optical fiber, thus the fiber lens
acted as a reference reflector as well as a focusing lens. The focal length of the lensed fiber probe was over 600 μm in
free space and the average imaging depth reached up to 3 mm, which was deep enough to examine the internal structure
of the pearl. The sensitivity of the system was experimentally obtained as 100dB. With an implemented system, the
presence of nucleus and the nacreous laminated pattern were confirmed and analyzed. Experimental results show that the
CP-OFDI system has great potential for identifying and grading pearls non-invasively but precisely.
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Myeong Jin Ju, Seon Young Ryu, Jihoon Na, Hae Young Choi, Hae Yeon Kim, Byeong Ha Lee, "Common-path optical frequency domain imaging system designed for identifying and grading pearls," Proc. SPIE 7556, Design and Quality for Biomedical Technologies III, 755613 (23 February 2010); https://doi.org/10.1117/12.841220