KTN-based high-speed axial and lateral scanning technique for an optical coherence tomography system and application to dental imaging

Damodaran Vani; Vasa Nilesh J.; Sarathi R.

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KTN-based high-speed axial and lateral scanning technique for an optical coherence tomography system and application to dental imaging

机译：基于KTN的高速轴向和横向扫描技术，用于光学相干断层扫描系统和牙科成像的应用

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A high-speed 840 nm based polarization-sensitive time domain optical coherence tomography (PSOCT) technique is proposed and demonstrated based on the quadratic electro-optic property of potassium tantalate niobate (KTN) crystals. A longitudinal (axial) scanning depth of approximate to 10 mu m is obtained for an applied AC voltage of 600 V, at 1000 Hz and temperature maintained around 40 degrees C. The OCT system with the KTN-based electro-optic delay line combined with a linear actuation is extended to image an early dental demineralization. For enhanced contrast by the elimination of the strong surface reflection from the sample and high-speed imaging, the quadratic electro-optically tunable PSOCT technique is proposed and demonstrated. Further, a lateral scanning range of 490 mu m is also demonstrated by controlling the KTN temperature at 35 degrees C for an applied voltage of 600 V on the tooth sample. This KTN-based quadratic electro-optic delay line combined with lateral scan approach provides an automated high-speed two-dimensional scanning of samples of interest. (C) 2018 Optical Society of America

机译：提出了一种高速840nm基极化敏感时域光相干断层扫描（PSOCT）技术，并基于钽酸盐铌酸钾（KTN）晶体的二次电光特性来证明。获得近似约10μm的纵向（轴向）扫描深度，用于600V的施加的AC电压，在1000Hz和温度下保持约40摄氏度。OCT系统与基于KTN的电光延迟线结合使用线性致动延伸到图像早期牙科脱矿质。为了通过消除来自样品和高速成像的强表面反射来提高对比度，提出并证明了二次电光可调谐PSOCT技术。此外，还通过在35℃下控制牙齿样品上的600V的施加电压来证明490μmM的横向扫描范围。该基于KTN的二次电光延迟线与横向扫描方法组合提供了感兴趣的样本的自动高速二维扫描。（c）2018年光学学会

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来源
《Applied optics》 |2018年第11期|共8页
作者
Damodaran Vani; Vasa Nilesh J.; Sarathi R.;
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Indian Inst Technol Madras Dept Engn Design Madras 600036 Tamil Nadu India;

Indian Inst Technol Madras Dept Engn Design Madras 600036 Tamil Nadu India;

Indian Inst Technol Madras Dept Elect Engn Madras 600036 Tamil Nadu India;

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KTN-based high-speed axial and lateral scanning technique for an optical coherence tomography system and application to dental imaging

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