22 February 2013 Birefringence analysis of cultured and imitation pearls using polarization-sensitive swept-source OCT
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Abstract
We present a birefringence analysis method based on polarization-sensitive swept-source optical coherence tomography (PS-SS-OCT) for distinguishing pearls. To cope with the round shape of general pearls, a rotation stage was used for the sample scanning. With the system, the birefringence of several cultured pearls including south sea, Akoya, freshwater cultured pearls, and imitation pearls are analyzed and compared. Interestingly, PS-SS-OCT surely shows well developed birefringence patterns of phase retardation and fast axis orientation with the cultured pearls, whereas the pattern does not appear in the imitation pearls. In addition, the intensity image can help to distinguish the cultured pearls. Therefore, PSSS-OCT enables a more accurate interpretation for identifying the cultured pearls from imitation pearls.
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Jae Hwi Lee, Jae Hwi Lee, Eun Jung Min, Eun Jung Min, Jun Geun Shin, Jun Geun Shin, Kwan Seob Park, Kwan Seob Park, Hea-Yeon Kim, Hea-Yeon Kim, Byeong Ha Lee, Byeong Ha Lee, "Birefringence analysis of cultured and imitation pearls using polarization-sensitive swept-source OCT", Proc. SPIE 8593, Optical Methods in Developmental Biology, 85930O (22 February 2013); doi: 10.1117/12.2003768; https://doi.org/10.1117/12.2003768
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