August 2019
Spotlight Summary by Kanwarpal Singh
High-resolution photoacoustic endoscope through beam self-cleaning in a graded index fiber
Miniaturized endoscopes with a diameter less than 2 millimeters that are capable of providing high-contrast, high-resolution images of lipid plaques and blood vessels are highly desirable in coronary artery and gastrointestinal studies. Intravascular photoacoustic imaging endoscopes are getting closer to satisfying these stringent requirements. A long-desired performance parameter for such endoscopes is to achieve high signal-to-noise ratio and optimal resolution, which are conflicting aims. High signal-to-noise ratio requires higher pulse power on the sample, which can only be transported using multimode fibers, but multimode-fiber-based endoscopes have poor resolution compared with single-mode-fiber-based endoscopes. In this work, using a graded index multimode fiber, the authors present a way to achieve both high signal-to-noise ratio and superior resolution, with better results than previously reported methods. This technical improvement will contribute to the adoption of this technique as a diagnostic tool in clinics in the near future.
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Article Information
High-resolution photoacoustic endoscope through beam self-cleaning in a graded index fiber
Yi Zhang, Yingchun Cao, and Ji-Xin Cheng
Opt. Lett. 44(15) 3841-3844 (2019) View: Abstract | HTML | PDF