Dispersion compensation in high-speed optical coherence tomography by acousto-optic modulation

被引：23

作者：

Xie, TQ ^{[1
]}

Wang, ZG ^{[1
]}

Pan, YT ^{[1
]}

机构：

[1] SUNY Stony Brook, Dept Biomed Engn, Stony Brook, NY 11794 USA

来源：

APPLIED OPTICS | 2005年 / 44卷 / 20期

关键词：

D O I：

10.1364/AO.44.004272

中图分类号：

O43 [光学];

学科分类号：

070207 [光学]; 0803 [光学工程];

摘要：

We report studies of the analyses of and compensation for group dispersion to improve the axial resolution of high-speed optical coherence tomography (OCT) by acousto-optic modulation (AOM). Theoretical modeling and experiments reveal that the high-order group dispersion induced by acousto-optic crystals broadens the measured coherence length (L-c) and thus degrades the axial resolution of OCT imaging. Based on our experimental studies, we can compensate for the dispersion to less than 50% broadening of the source L-c by adjusting the grating-lens-based optical delay in the reference arm and can further eliminate it by inserting like acousto-optic crystals in the sample arm of the OCT system. The results demonstrate that this ACM-mediated OCT system permits high-performance OCT imaging at A-scan rates of as much as 4 kHz by use of a resonant scanner. Because of its ultrastable direct frequency modulation, this AOM-mediated OCT system can potentially improve the performance of high-speed Doppler OCT techniques. (c) 2005 Optical Society of America.

引用

页码：4272 / 4280

页数：9

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