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12 August 2008Fiber probes used in optical coherence tomography
Quality and parameters of probing optical beams are extremely important in optical coherence tomography (OCT)
systems both for image quality and light coupling efficiency considerations. For example, the shape, size, focal position,
and focal range of such beams could have a great impact on the lateral resolution, penetration depth, and signal-to-noise
ratio of the image. We present a design, construction and characterization of different variations of GRIN and ball fiber
lenses, for ultra-small OCT probes. Those fiber probes are made of a single mode fiber and a GRIN or ball fiber lens
with or without a fiber spacer between them. The probe diameters are smaller than 0.3 mm. We discuss design methods,
fabrication techniques, and measured performance compared with modeling results. We demonstrate swept-source OCT
images with different fiber probes.