Results 241 to 250 of about 705,634 (314)

Optimal holographic Fourier-transform lens

Applied Optics, 1984
A Fourier-transform holographic optical element is described that has low aberrations over an extended range of spatial frequencies. The design is based on a relatively simple analytic solution involving optimization by minimizing the output wave-front deviations.
J, Kedmi, A A, Friesem
openaire   +2 more sources

Multi-bottle beam generation using acoustic holographic lens

, 2020
Acoustic tweezers are a method of using acoustic waves to manipulate small particles in medium such as water or air without touching or contaminating them.
Qinxin Zhou, Jing Zhang, Xuemei Ren, Zheng Xu, Xiao-jun Liu   +4 more
semanticscholar   +1 more source

Photometrically corrected holographic lens

SPIE Proceedings, 2009
Optical detectors for illumination measurements have the known photopic response V(λ), which is implemented with the help of colored glass filters attached to silicon detectors. In the case of high precision photometry the filter of each detector is hand prepared and the spectral response measured until it is matched to the function V(λ). This method
J. G. Suarez-Romero, R. Salas-Zuñiga
openaire   +1 more source

Millimeter-Wave Holographic Flat Lens Antenna for Orbital Angular Momentum Multiplexing

IEEE Transactions on Antennas and Propagation, 2021
In this article, a holograph-inspired flat lens antenna capable of simultaneously transmitting two independent coaxially propagating orbital angular momentum (OAM) beams operating at 60 GHz is proposed.
Gengbo Wu, K. Chan, K. Shum, C. Chan
semanticscholar   +1 more source

Compact lens-less holographic memory

1997 Optical Data Storage Topical Meeting ODS Conference Digest, 2002
A common problem of many holographic memory systems is that they must occupy relatively large areas in order to accommodate the various imaging optics necessary for system operation. A typical memory system requires an imaging lens system between the input and output devices, such as a spatial light modulator (SLM) and charge-coupled device (CCD).
E. Chuang, J.-J. Drolet, G. Barbastathis, D. Psaltis   +3 more
openaire   +1 more source

Photopolymer-based coaxial holographic lens for spectral confocal displacement and morphology measurement.

Optics Letters, 2019
A spectral confocal displacement and morphology measurement device with a photopolymer-based coaxial holographic lens as a high dispersion element is developed.
Hongpeng Liu, Baohua Wang, Rui Wang, Mingchang Wang, Dan Yu, Weibo Wang   +5 more
semanticscholar   +1 more source

Enhanced quantitative phase imaging in Mach-Zehnder interferometer-based digital holographic microscopy by modulation of the object illumination with an electrically focus tunable lens

Optical Metrology, 2021
In laser based digital holographic microscopy (DHM) quantitative phase imaging (QPI) is affected by scattering and interference fringes due to internal reflections in the experimental setup.
B. Kemper, Á. Barroso, K. Eder, A. Marzi, Sabrina Ritz, Angelos Ntovas, Jürgen Schnekenbürger, S. Ketelhut   +7 more
semanticscholar   +1 more source

Theoretical Analysis of a Volume Holographic Lens Using Matlab

2019 PhotonIcs & Electromagnetics Research Symposium - Spring (PIERS-Spring), 2019
Volume holographic lenses have great potential for different types of applications requiring light redirection and beam shaping such as solar light collection and LED light management.
S. Keshri, K. Murphy, I. Naydenova, S. Martin   +3 more
semanticscholar   +1 more source

Lens-Free Holographic Imaging-Based Immunosensor Using Unpaired Data Set Signal-to-Noise Ratio-Enhanced Modal Transformation for Biosensing.

Analytical Chemistry
Conventional microscopes have limited capacities to reconcile the trade-off between the lens and field of view (FOV). Thus, the imaging field and accuracy of immunosensors remain restricted.
Minjie Han, Chen Zhan, Junpeng Zhao, Weiqi Zhao, Rui Chen, Yongzhen Dong, Yiping Chen   +6 more
semanticscholar   +1 more source

Use Of A Holographic Lens For Producing Cylindrical Holographic Stereograms

Optical Engineering, 1981
The production of cylindrical holographic stereograms, or multiplex holograms, requires the use of a large, low f/number cylindrical lens to form a line image on the holographic film. To have an image of reasonable size for display purposes, the f/number of the lens must be quite small, on the order of f/1, and the dimensions of the lens must be ...
Richard L. Fusek, Lloyd Huff
openaire   +1 more source