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23 February 2010 Common-path optical frequency domain imaging system designed for identifying and grading pearls
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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, and 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);

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