Publication

Parallel broadband fluorescent light source for optical coherence tomography

René Salathé, Theo Lasser, Stéphane Bourquin
2005
Conference Papers

Abstract

We present a new light source for parallel Optical Coherence Tomography (OCT) based on multiple waveguides written in Ti:sapphire. Each channel can generate a spectrum of 174 nm bandwidth centered at 772 nm, with an optical power on sample of 30 mu W. A system depth resolution of 1.9 mu m is obtained, which correspond to 1.5 mu m in tissue.

Official source

https://infoscience.epfl.ch/entities/publication/75b8c561-12d0-4a1a-b246-ea8b812dc24b

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René Salathé, Theo Lasser, Stéphane Bourquin
2005
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/75b8c561-12d0-4a1a-b246-ea8b812dc24b

About this result

Related concepts (10)

Optical coherence tomography

Optical coherence tomography (OCT) is an imaging technique that uses low-coherence light to capture micrometer-resolution, two- and three-dimensional images from within optical scattering media (e.g., biological tissue). It is used for medical imaging and industrial nondestructive testing (NDT). Optical coherence tomography is based on low-coherence interferometry, typically employing near-infrared light. The use of relatively long wavelength light allows it to penetrate into the scattering medium.

Coherence (physics)

In physics, coherence expresses the potential for two waves to interfere. Two monochromatic beams from a single source always interfere. Physical sources are not strictly monochromatic: they may be partly coherent. Beams from different sources are mutually incoherent. When interfering, two waves add together to create a wave of greater amplitude than either one (constructive interference) or subtract from each other to create a wave of minima which may be zero (destructive interference), depending on their relative phase.

Light-emitting diode

A light-emitting diode (LED) is a semiconductor device that emits light when current flows through it. Electrons in the semiconductor recombine with electron holes, releasing energy in the form of photons. The color of the light (corresponding to the energy of the photons) is determined by the energy required for electrons to cross the band gap of the semiconductor. White light is obtained by using multiple semiconductors or a layer of light-emitting phosphor on the semiconductor device.

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