Results 1 to 10 of about 224,086 (25)

Resolution-enhanced OCT and expanded framework of information capacity and resolution in coherent imaging [PDF]

Sci Rep 11, 20541 (2021), 2021
Spatial resolution in optical microscopy has traditionally been treated as a fixed parameter of the optical system. Here, we present an approach to enhance transverse resolution in beam-scanned optical coherence tomography (OCT) beyond its aberration-free resolution limit, without any modification to the optical system.
arxiv   +1 more source

Unified k-space theory of optical coherence tomography [PDF]

Advances in Optics and Photonics 13, 462-514 (2021), 2020
We present a general theory of optical coherence tomography (OCT), which synthesizes the fundamental concepts and implementations of OCT under a common 3D k-space framework. At the heart of this analysis is the Fourier diffraction theorem, which relates the coherent interaction between a sample and plane wave to the Ewald sphere in the 3D k-space ...
arxiv   +1 more source

Comparative analysis of full-field OCT and optical transmission tomography [PDF]

, 2023
This work compares two tomographic imaging technologies, time-domain full-field optical coherence tomography (FFOCT) working in reflection and optical transmission tomography (OTT), using a new optical setup that combines both. We show that, due to forward-scattering properties, the axial sectioning and contrast in OTT can be optimized by tuning ...
arxiv   +1 more source

Multirate Spectral Domain Optical Coherence Tomography [PDF]

arXiv, 2023
Optical coherence tomography is state-of-the-art in non-invasive imaging of biological structures. Spectral Domain Optical Co-herence Tomography is the popularly used variation of this technique, but its performance is limited by the bandwidth and res-olution of the system.
arxiv  

Ghost optical coherence tomography [PDF]

, 2018
We demonstrate experimentally ghost optical coherence tomography using a broadband incoherent supercontinuum light source with shot-to-shot random spectral fluctuations. The technique is based on ghost imaging in the spectral domain where the object is the spectral interference pattern generated from an optical coherence tomography interferometer in ...
arxiv   +1 more source

Demonstration of Dispersion-Cancelled Quantum-Optical Coherence Tomography [PDF]

Phys. Rev. Lett. 91, 083601 (2003), 2003
We present an experimental demonstration of quantum optical coherence tomography (QOCT). The technique makes use of an entangled twin-photon light source to carry out axial optical sectioning. QOCT is compared to conventional optical co1herence tomography (OCT).
arxiv   +1 more source

Second harmonic optical coherence tomography [PDF]

, 2004
Second harmonic optical coherence tomography, which uses coherence gating of second-order nonlinear optical response of biological tissues for imaging, is described and demonstrated. Femtosecond laser pulses were used to excite second harmonic waves from collagen harvested from rat tail tendon and a reference nonlinear crystal.
arxiv   +1 more source

Scheme for coherent-state quantum process tomography via normally-ordered moments [PDF]

Phys. Rev. A 95, 032336 (2017), 2017
Using coherent states in optical quantum process tomography is a practically-relevant approach. Here, we develop a framework for complete characterization of quantum-optical processes in terms of normally-ordered moments by using coherent states as probes. We derive the associated superoperator tensors for several optical processes.
arxiv   +1 more source

Curved-field optical coherence tomography: large-field imaging of human corneal cells and nerves [PDF]

Optica 7, 872-880 (2020), 2020
High-resolution optical imaging methods, such as confocal microscopy and full-field optical coherence tomography, capture flat optical sections of the sample. If the sample is curved, the optical field sections through several sample layers and the view of each layer is reduced.
arxiv   +1 more source

Low-coherence optical diffraction tomography using a ferroelectric liquid crystal spatial light modulator [PDF]

, 2020
Optical diffraction tomography (ODT) is a three-dimensional (3D) label-free imaging technique. The 3D refractive index distribution of a sample can be reconstructed from multiple two-dimensional optical field images via ODT. Herein, we introduce a temporally low-coherence ODT technique using a ferroelectric liquid crystal spatial light modulator (FLC ...
arxiv   +1 more source