Results 31 to 40 of about 21,242 (251)

Higher-resolution wavefront sensing based on sub-wavefront information extraction

Frontiers in Physics
The limited spatial sampling rates of conventional Shack–Hartmann wavefront sensors (SHWFSs) make them unable to sense higher-order wavefront distortion.
Hongli Guan, Hongli Guan, Hongli Guan, Hongli Guan, Wang Zhao, Wang Zhao, Wang Zhao, Shuai Wang, Shuai Wang, Shuai Wang, Kangjian Yang, Kangjian Yang, Kangjian Yang, Mengmeng Zhao, Mengmeng Zhao, Mengmeng Zhao, Shenghu Liu, Shenghu Liu, Shenghu Liu, Shenghu Liu, Han Guo, Han Guo, Han Guo, Ping Yang, Ping Yang, Ping Yang   +25 more
doaj   +1 more source

The Deformable Mirror Demonstration Mission (DeMi) CubeSat: optomechanical design validation and laboratory calibration

, 2018
Coronagraphs on future space telescopes will require precise wavefront correction to detect Earth-like exoplanets near their host stars. High-actuator count microelectromechanical system (MEMS) deformable mirrors provide wavefront control with low size ...
Allan, Gregory, Barnes, Derek, Cahoy, Kerri L., Douglas, Ewan S., Egan, Mark, Furesz, Gabor, Grunwald, Warren, Gubner, Jennifer, Haughwout, Christian, Holden, Bobby G., Pereira, Paula do Vale, Stein, Abigail J.   +11 more
core   +1 more source

Fourier domain preconditioned conjugate gradient algorithm for atmospheric tomography [PDF]

, 2006
By 'atmospheric tomography' we mean the estimation of a layered atmospheric turbulence profile from measurements of the pupil-plane phase (or phase gradients) corresponding to several different guide star directions.
Ellerbroek, Brent L., Vogel, Curtis R., Yang, Qiang   +2 more
core   +1 more source

Measurement of Thermo-Elastic Deformation of an Optic using a Polarization Based Shearing Interferometer

, 2012
A shearing interferometer is presented which uses polarization control to shear the wavefront and to modulate the interference pattern. The shear is generated by spatial walk-off in a birefringent crystal. By adjusting the orientation of the birefringent
Abramowitz, Agrawal, Fowels, Ghiglia, Hello, Hello, Kothiyal, Lu, Murukeshan, Nikogosyan, Rosso, Servin, Winkler, Yariv, Zhu Tuan   +14 more
core   +1 more source

Absorbing new subjects: holography as an analog of photography [PDF]

, 2006
I discuss the early history of holography and explore how perceptions, applications, and forecasts of the subject were shaped by prior experience. I focus on the work of Dennis Gabor (1900–1979) in England,Yury N. Denisyuk (1927-2005) in the Soviet Union,
Johnston, Sean F.
core   +2 more sources

A Single Far-Field Deep Learning Adaptive Optics System Based on Four-Quadrant Discrete Phase Modulation

Sensors, 2020
In adaptive optics (AO), multiple different incident wavefronts correspond to a same far-field intensity distribution, which leads to a many-to-one mapping.
Xuejing Qiu, Tao Cheng, Lingxi Kong, Shuai Wang, Bing Xu   +4 more
doaj   +1 more source

Implementation of a digital optical phase conjugation system and its application to study the robustness of turbidity suppression by phase conjugation [PDF]

, 2010
In this work, we report a novel high capacity (number of degrees of freedom) open loop adaptive optics method, termed digital optical phase conjugation (DOPC), which provides a robust optoelectronic optical phase conjugation (OPC) solution.
Cui, Meng, Yang, Changhuei
core   +2 more sources

Imaging of Biphoton States: Fundamentals and Applications

Advanced Functional Materials, EarlyView.
Quantum states of two photons exhibit a rich polarization and spatial structure, which provides a fundamental resource of strongly correlated and entangled states. This review analyzes the physics of these intriguing properties and explores the various techniques and technologies available to measure them, including the state of the art of their ...
Alessio D'Errico, Ebrahim Karimi
wiley   +1 more source

Structure Formation in Butterfly Scales: Interplay of Genetic Control, Mechanical Instabilities, and Dynamic Material Properties

Advanced Functional Materials, EarlyView.
Butterfly wing scales are intricate cuticular functional nanosctructures. This perspective suggests that spatially varying material properties, cytoskeletal constraints, and growth‐driven mechanical instabilities shape the resulting nanoscale architectures created from single cells.
Anupama Prakash, Victoria Lloyd, Yi Yang, Anna‐Lee Jessop, Anthony McDougal, Primož Pirih, Guillaume Duclos, Andrew Parnell, Mathias Kolle, Nicola J. Nadeau, Bodo D. Wilts   +10 more
wiley   +1 more source

Shack-Hartmann Wavefront Sensing of Ultrashort Optical Vortices

Sensors, 2021
Light beams carrying Orbital Angular Momentum (OAM), also known as optical vortices (OV), have led to fascinating new developments in fields ranging from quantum communication to novel light–matter interaction aspects. Even though several techniques have
Alok Kumar Pandey, Tanguy Larrieu, Guillaume Dovillaire, Sophie Kazamias, Olivier Guilbaud   +4 more
doaj   +1 more source