Lens-free all-fiber probe with an optimized output beam for optical coherence tomography

Abstract

A high-efficiency lensless all-fiber probe for optical coherence tomography (OCT) is presented. The probe is composed of a segment of large-core multimode fiber (MMF), a segment of tapered MMF, and a length of single-mode fiber (SMF). A controllable output beam can be designed by a simple adjustment of its probe structure parameters (PSPs), instead of the selection of fibers with different optical parameters. A side-view probe with a diameter of 340 μm and a rigid length of 6.37 mm was fabricated, which provides an effective imaging range of ∼0.6 mm with a full width at half-maximum beam diameter of less than 30 μm. The insertion loss of the probe was measured to be 0.81 dB, ensuring a high sensitivity of 102.25 dB. Satisfactory images were obtained by the probe-based OCT system, demonstrating the feasibility of the probe for endoscopic OCT applications.

Biophotonics in China

“…They made an approach to resolve this trade‐off between lateral resolution and depth of focus by a synthetic effective point spread function in the optical‐path‐length domain, and a synthesized quasineedle‐like focus providing four‐fold extension of conventional depth of focus is realized. Ding also developed a high‐efficiency lens‐free all‐fiber probe for OCT . A controllable output beam can be designed by simple adjustment of its probe structure parameters (PSPs) instead of selection of fibers with different optical parameters.…”

Stomach wall structure and vessels imaging by acoustic resolution photoacoustic microscopy

“…Recently, optical endoscopic imaging modalities, like narrow band imaging endoscopy[ 5 ], endoscopic optical coherent tomography[ 6 ] and confocal laser endomicroscopy[ 7 ] have been developed. They can detect tissue or tissue changes with high sensitivity and high spatial resolution.…”