Abstract

We present the smallest reported side-viewing needle probe for optical coherence tomography (OCT). Design, fabrication, optical characterization, and initial application of a 30-gauge (outer diameter 0.31mm) needle probe are demonstrated. Extreme miniaturization is achieved by using a simple all-fiber probe design incorporating an angle-polished and reflection-coated fiber-tip beam deflector. When inserted into biological tissue, aqueous interstitial fluids reduce the probe’s inherent astigmatism ratio to 1.8, resulting in a working distance of 300μm and a depth-of-field of 550μm with beam diameters below 30μm. The needle probe was interfaced with an 840nm spectral-domain OCT system and the measured sensitivity was shown to be only 7dB lower than that of a comparable galvo-scanning sample arm configuration. 3D OCT images of lamb lungs were acquired over a depth range of 600μm, showing individual alveoli and bronchioles.

© 2011 Optical Society of America

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