scholarly journals Three-dimensional focusing through scattering media using conjugate adaptive optics with remote focusing (CAORF)

2017 ◽  
Vol 25 (9) ◽  
pp. 10368 ◽  
Author(s):  
Xiaodong Tao ◽  
Tuwin Lam ◽  
Bingzhao Zhu ◽  
Qinggele Li ◽  
Marc R. Reinig ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Three Dimensional ◽  
Scattering Media

scholarly journals Double Interferometer Design for Independent Wavefront Manipulation in Spectral Domain Optical Coherence Tomography

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Jonas Kanngiesser ◽  
Maik Rahlves ◽  
Bernhard Roth
Keyword(s):  
Optical Coherence Tomography ◽  
Adaptive Optics ◽  
Three Dimensional ◽  
Beam Shaping ◽  
Spectral Domain ◽  
Optical Coherence ◽  
Structured Illumination ◽  
Scattering Media ◽  
Light Modulator ◽  
Sd Oct

Abstract Spectral domain optical coherence tomography (SD-OCT) is a highly versatile method which allows for three dimensional optical imaging in scattering media. A number of recent publications demonstrated the technique to benefit from structured illumination and beam shaping approaches, e.g. to enhance the signal-to-noise ratio or the penetration depth with samples such as biological tissue. We present a compact and easy to implement design for independent wavefront manipulation and beam shaping at the reference and sample arm of the interferometric OCT device. The design requires a single spatial light modulator and can be integrated to existing free space SD-OCT systems by modifying the source arm only. We provide analytical and numerical discussion of the presented design as well as experimental data confirming the theoretical analysis. The system is highly versatile and lends itself for applications where independent phase or wavefront control is required. We demonstrate the system to be used for wavefront sensorless adaptive optics as well as for iterative optical wavefront shaping for OCT signal enhancement in strongly scattering media.

Adaptive optics enables three-dimensional single particle tracking at the sub-millisecond scale

2013 ◽  
Vol 102 (17) ◽  
pp. 173702 ◽  
Author(s):  
Manuel F. Juette ◽  
Felix E. Rivera-Molina ◽  
Derek K. Toomre ◽  
Joerg Bewersdorf
Keyword(s):  
Adaptive Optics ◽  
Particle Tracking ◽  
Single Particle ◽  
Three Dimensional ◽  
Single Particle Tracking

scholarly journals High contrast three-dimensional photoacoustic imaging through scattering media by localized optical fluence enhancement

2013 ◽  
Vol 21 (22) ◽  
pp. 26671 ◽  
Author(s):  
Antonio M. Caravaca-Aguirre ◽  
Donald B. Conkey ◽  
Jacob D. Dove ◽  
Hengyi Ju ◽  
Todd W. Murray ◽  
...  
Keyword(s):  
Photoacoustic Imaging ◽  
Three Dimensional ◽  
High Contrast ◽  
Scattering Media

Simulation of Radiation Heat Transfer of Three Dimensional Participating Media by Radiative Exchange Method

2008 ◽  
Author(s):  
Mohammad Hadi Bordbar ◽  
Timo Hyppa¨nen
Keyword(s):  
Heat Transfer ◽  
Balance Equation ◽  
Radiation Heat Transfer ◽  
Three Dimensional ◽  
Radiation Balance ◽  
Scattering Media ◽  
Radiation Heat ◽  
Exchange Method ◽  
Participating Media ◽  
Radiative Exchange

This paper describes the theoretical bases of the Radiative Exchange Method, a new numerical method for simulating radiation heat transfer. By considering radiative interaction between all points of the geometry and solving the radiation balance equation in a mesh structure coarser than the structure used in computational fluid flow calculation, this method is able to simulate radiative heat transfer in arbitrary 3D space with absorbing, emitting and scattering media surrounded by emitting, absorbing and reflecting surfaces. A new concept is introduced, that of the exchange factors between the different elements that are necessary for completing the radiative balance equation set. Using this method leads to a set of algebraic equations for the radiative outgoing power from each coarse cell being produced and the result of this set of equations was then used to calculate the volumetric radiative source term in the fine cell structure. The formulation of the exchange factor for a three-dimensional state and also a mesh size analysis that was conducted to optimize the accuracy and runtime are presented. The results of this model to simulate typical 3D furnace shape geometry, is verified by comparison with those of other numerical methods.

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