Results 71 to 80 of about 51,169 (250)

Compact Monocular Video‐Ophthalmoscope to Measure Retinal Reflectance Changes to Flicker Light Stimuli

Journal of Biophotonics, EarlyView.
This study presents a compact monocular VO that captures high‐frame‐rate retinal videos of the ONH during flicker light stimulation. The device demonstrated its ability to detect flicker‐induced changes in retinal parameters related to blood flow in healthy subjects, providing insights into temporal and spatial retinal variations.
Radim Kolar, Tomas Vicar, Jiri Chmelik, Roman Jakubicek, Jan Odstrcilik, Michal Nohel, Karolina Skorkovska, Ralf P. Tornow   +7 more
wiley   +1 more source

Numerical heterodyne holography with two-dimensional photodetector arrays [PDF]

Optics Letters 25, 10 (2000) 716, 2011
We present an original heterodyne holography method for digital holography that relies on two-dimensional heterodyne detection to record the phase and the amplitude of a f ield. The technique has been tested on objects as much as 13 mm in size. Consistency checks were performed, and high-resolution images were computed.
arxiv  

Full‐color holographic image capture: Cholesteric liquid crystal circular polarizer combined with geometric phase lens reduces noise in self‐interference incoherent digital holography

Journal of the Society for Information Display, EarlyView.
By using cholesteric liquid crystals as circular polarization filters in quarter‐waveplate condition GPL (QW‐GPL) based SIDH, a stable circular polarization state is ensured, which reduces color distortion and polarization noise, thereby significantly enhancing the reconstructed image quality in full‐color QW‐GPL‐based SIDH.
Jin‐Hyeok Seo, Jae‐Won Lee, Jung‐Yeop Shin, Min‐Seok Kim, Young‐Min Cho, Hyeon‐Su Jeong, Erkhembaatar Dashdavaa, Kihong Choi, Keehoon Hong, Hak‐Rin Kim   +9 more
wiley   +1 more source

Bendable Fiber Lens for Minimally Invasive Endoscopy

Laser &Photonics Reviews, EarlyView.
Translating ex vivo imaging to minimally invasive in vivo applications is of outstanding scientific and socioeconomic relevance. 3D imaging based on tiny lensless fiber endoscopes requires complex setups and computational schemes, so far. Bridging this gap, imaging through a unique optical fiber that mimics the functionality of a lens but is minimally ...
Ronja Stephan, Elias Scharf, Kinga Zolnacz, Waclaw Urbanczyk, Katharina Hausmann, Matthias Ließmann, Johannes Gürtler, Tom Glosemeyer, Jürgen Czarske, Michael Steinke, Robert Kuschmierz   +10 more
wiley   +1 more source

A Recording Structure for Extending the Detection Angle in Off-Axis Digital Holography

IEEE Photonics Journal
In digital holography, the sampling of the object wavefront is determined by the spatial resolution of the image sensors, which limits the angle range of the object wavefront.
Yuanyuan Liu, Feiyan Hu, Qingwen Liu
doaj   +1 more source

Holography and its applications for industry 4.0: An overview

Internet of Things and Cyber-Physical Systems, 2022
Industry 4.0 is a new stage in the organisation and control of the industrial value chain, interchangeably with the fourth industrial revolution. It has a broad vision with well-defined frameworks and reference designs, focusing on bridging physical ...
Abid Haleem, Mohd Javaid, Ravi Pratap Singh, Rajiv Suman, Shanay Rab   +4 more
doaj  

High‐Speed Multimode Fiber Imaging Using Binary‐Modulated Silicon Photonics Optical Phased Array

Laser &Photonics Reviews, EarlyView.
A multimode fiber imaging system at 500 frames per second is experimentally demonstrated. It is enabled by a p‐i‐n diode‐based silicon photonics optical phased array. To simplify the electrical driving of p‐i‐n diodes, a binary modulation method with a costumed‐designed digital driver circuit is proposed. Reconstruction of each frame takes only 0.1 ms,
Gaolei Hu, Yue Qin, Hongnan Xu, Hon Ki Tsang   +3 more
wiley   +1 more source

Extending the Depth of Field beyond Geometrical Imaging Limitations Using Phase Noise as a Focus Measure in Multiwavelength Digital Holography

Applied Sciences, 2018
Digital holography is a well-established technology for optical quality control in industrial applications. Two common challenges in digital holographic measurement tasks are the ambiguity at phase steps and the limited depth of focus.
Tobias Seyler, Markus Fratz, Tobias Beckmann, Annelie Schiller, Alexander Bertz, Daniel Carl   +5 more
doaj   +1 more source

Single-shot Fresnel incoherent digital holography based on geometric phase lens [PDF]

arXiv, 2018
Single-shot and incoherent imaging are two important properties for digital holography technique to extend its application range. In this paper, a simple and compact in-line Fresnel incoherent digital holographic recording system with capability of single-shot and three-dimensional imaging is proposed.
arxiv  

Nonlinear Digital Holography

Biomedical Optics and 3-D Imaging, 2010
We extend digital holography, and the techniques of computational imaging in general, to beam propagation in nonlinear media. Nonlinearity mixes high-frequency spatial modes with low-frequency ones, so that reconstruction results in super-resolution of the object.
Jason W. Fleischer, Christopher Barsi
openaire   +2 more sources