Journal ArticleDOI
KTN-based high-speed axial and lateral scanning technique for an optical coherence tomography system and application to dental imaging.
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TLDR
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, which provides an automated high- speed two-dimensional scanning of samples of interest.Abstract:
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 ≈10 μm is obtained for an applied AC voltage of 600 V, at 1000 Hz and temperature maintained around 40°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 μm is also demonstrated by controlling the KTN temperature at 35°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.read more
Citations
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Journal ArticleDOI
First-Principles Calculation of Defect Properties on Copper Doped KTaO3 Crystal
Huadi Zhang,Lie-Kun Yang,Chengcheng Qiu,Bing Liu,Jing Li,Yuanyuan Zhang,Yanyan Hu,Lei Wei,Xianshun Lv,Xuping Wang +9 more
Journal ArticleDOI
Enhanced c-axis KTN beam deflector by compensating compositional gradient effect with a thermal gradient
TL;DR: In this paper, an enhanced c-axis potassium tantalate niobate (KTN) based electro-optic (EO) deflector by compensating the performance degradation using a thermal gradient was proposed.
References
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TL;DR: Dental caries is a transmissible bacterial disease process caused by acids from bacterial metabolism diffusing into enamel and dentine and dissolving the mineral, resulting in lesions that are much less soluble than the original mineral.
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Wolfgang Drexler,Mengyang Liu,Abhishek Kumar,Tschackad Kamali,Angelika Unterhuber,Rainer A. Leitgeb +5 more
TL;DR: Various multimodal imaging modalities with OCT incorporated are reviewed, in that these multi-modal implementations can synergistically compensate for the fundamental limitations of OCT when it is used alone.
Journal ArticleDOI
Polarization sensitive optical coherence tomography in the human eye.
TL;DR: A variety of different applications of this technique are presented in ocular imaging that are ranging from the anterior to the posterior eye segment and the benefits of the method for imaging different diseases as, e.g., age related macula degeneration or glaucoma is demonstrated.