1. Ultrathin lensed fiber based anastigmatic needle probe for endoscopic swept source optical coherence tomography

    Ultrathin lensed fiber based anastigmatic needle probe for endoscopic swept source optical coherence tomography

    We present an anastigmatic all-fiber needle probe utilizing a fiber ball lens for endoscopic swept source optical coherence tomography (OCT). In order to avoid the astigmatism caused by the cylindrical profile of the imaging fiber or the outer protective tube, the lensed fiber probe is directly packaged into a 26-gauge hypodermic needle with a side opening optical window. A total internal reflection surface is fabricated on the tip of the no-core fiber (NCF) to deflect the beam with the lowest power loss. The working distance and the focused spot size of the probe can be optimized by adjusting the length ...

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