Publication

Optical tomography at the microscopic scale by means of a numerical low coherence holographic technique

Christian Depeursinge, Etienne Cuche
1996
Conference Papers

Abstract

We describe here a numerical application of the optical low- coherence holographic microscopy (OLCHM) technique. A low coherent source illuminates an object and the backscattered light interfere with a reference wave which optical path's length can be precisely adjusted. Holograms are recorded by a CCD camera and numerically reconstructed. With this technique optical tomography can be performed with a single scan along the optical axis. The transverse resolution of the reconstructed images mainly depends on the optics components used and approaches the diffraction limit. Using a Ti:Sapphire laser a depth resolution of about 30 micrometers has been achieved.

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https://infoscience.epfl.ch/entities/publication/c37132f1-b4c2-4d05-aa53-a3afe0ccd0c9

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Christian Depeursinge, Etienne Cuche
1996
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/c37132f1-b4c2-4d05-aa53-a3afe0ccd0c9

About this result

Related concepts (32)

Speckle (interference)

Speckle, speckle pattern, or speckle noise is a granular degrading the as a consequence of interference among wavefronts in coherent imaging systems, such as radar, synthetic aperture radar (SAR), medical ultrasound and optical coherence tomography. Speckle is not external noise; rather, it is an inherent fluctuation in diffuse reflections, because the scatterers are not identical for each cell, and the coherent illumination wave is highly sensitive to small variations in phase changes.

Diffraction

Diffraction is the interference or bending of waves around the corners of an obstacle or through an aperture into the region of geometrical shadow of the obstacle/aperture. The diffracting object or aperture effectively becomes a secondary source of the propagating wave. Italian scientist Francesco Maria Grimaldi coined the word diffraction and was the first to record accurate observations of the phenomenon in 1660.

Fourier optics

Fourier optics is the study of classical optics using Fourier transforms (FTs), in which the waveform being considered is regarded as made up of a combination, or superposition, of plane waves. It has some parallels to the Huygens–Fresnel principle, in which the wavefront is regarded as being made up of a combination of spherical wavefronts (also called phasefronts) whose sum is the wavefront being studied. A key difference is that Fourier optics considers the plane waves to be natural modes of the propagation medium, as opposed to Huygens–Fresnel, where the spherical waves originate in the physical medium.

Related publications (15)

Optical tomography at the microscopic scale by means of a numerical low coherence holographic technique

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