Results 11 to 20 of about 9,355,325 (300)

Wavefront control of subcycle vortex pulses via carrier-envelope-phase tailoring [PDF]

Light: Science & Applications, 2023
The carrier-envelope phase (CEP) of an ultrashort laser pulse is becoming more crucial to specify the temporal characteristic of the pulse’s electric field when the pulse duration becomes shorter and attains the subcycle regime; here, the pulse duration ...
Yu-Chieh Lin, Katsumi Midorikawa, Yasuo Nabekawa   +2 more
doaj   +2 more sources

A Relativistic Adaptive Gradient Descent Enhanced SPGD Algorithm for Wavefront Sensorless Adaptive Optics [PDF]

Micromachines
Deformable mirrors (DMs) serve as the core wavefront correction devices in wavefront sensorless adaptive optics (AO) systems, and their performance is predominantly determined by the convergence speed and stability of the control algorithm.
Huizhen Yang, Lingzhe Tang, Peng Chen, Chen Sun, Xinyu Xiao, Zhiguang Zhang, Jiacheng Zhou   +6 more
doaj   +2 more sources

All-optical closed-loop control of human cardiomyocyte networks exploiting holographic optogenetics [PDF]

Communications Engineering
Heart diseases can trigger life-threatening arrhythmias by disrupting cardiac contraction wavefront propagation. In contrast to conventional treatments like electrical pacemakers, optogenetics offers high spatial and temporal resolution for non-invasive ...
Robert Wendland, Felix Schmieder, Muhammad Atif Sikandar, Frithjof Paul Knüppel, Wolfram-Hubertus Zimmermann, Olaf Bergmann, Lars Büttner, Jürgen W. Czarske   +7 more
doaj   +2 more sources

Advanced Wavefront Control Techniques [PDF]

, 2001
Programs at LLNL that involve large laser systems--ranging from the National Ignition Facility to new tactical laser weapons--depend on the maintenance of laser beam quality through precise control of the optical wavefront. This can be accomplished using adaptive optics, which compensate for time-varying aberrations that are often caused by heating in ...
Olivier, S. S., Brase, J. M., Avicola, K., Thompson, C. A., Kartz, M. W., Winters, S., Hartley, R., Wihelmsen, J., Dowla, F. V., Carrano, C. J., Bauman, B. J., Pennington, D. M., Lande, D., Sawvel, R. M., Silva, D. A., Cooke, J. B., Brown, C. G.   +16 more
openaire   +3 more sources

Metasurface-Enabled Helical Wavefront Fingerprint Metrology for Quantitative Retrieval of Liquid Optical Constants. [PDF]

Adv Sci (Weinh)
A metasurface‐enabled helical wavefront fingerprint (MHWF) paradigm is proposed for quantitative and specific retrieval of a liquid medium's refractive index and extinction coefficient. The liquid's complex dielectric response governs the wavefront evolution of the metasurface‐generated focused vortex beam, forming a distinctive three‐dimensional ...
Zhou Y, Li H, Li S, Jiao F, Du Y, Kim JT, Lee SS, Choi DY, Ding F, Yu X, Guan X.   +10 more
europepmc   +2 more sources

Unidirectional guided-wave-driven metasurfaces for arbitrary wavefront control [PDF]

Nature Communications
Metasurfaces are capable of fully reshaping the wavefronts of incident beams in desired manners. However, the requirement for external light excitation and the resonant nature of their meta-atoms, make challenging their on-chip integration.
Shiqing Li, Kosmas L. Tsakmakidis, Tao Jiang, Qian Shen, Hang Zhang, Jinhua Yan, Shulin Sun, Linfang Shen   +7 more
doaj   +2 more sources

Predictive control of thermally induced wavefront aberrations

Optics Express, 2013
In this paper we experimentally demonstrate the proof of concept for predictive control of thermally induced wavefront aberrations in optical systems. On the basis of the model of thermally induced wavefront aberrations and using only past wavefront measurements, the proposed adaptive optics controller is able to predict and to compensate the future ...
Haber, A. (author), Polo, A. (author), Maj, I. (author), Pereira, S.F. (author), Urbach, H.P. (author), Verhagen, M.H.G. (author)   +5 more
openaire   +6 more sources

Inverse theory of wavefront shaping in nonlinear scattering media [PDF]

Nature Communications
Scattering fundamentally limits the propagation of light in complex media, yet controlling it is essential for transformative advances in imaging, sensing, and optical communication.
Daixuan Wu, Zhen Yi, Jiaming Liang, Tijian Li, Zhongzheng Zhu, Zexian Zhang, Haitao Ye, Jiawei Luo, Zhengyang Wang, Meng Liu, Zhi-Chao Luo, Yuecheng Shen   +11 more
doaj   +2 more sources

Twin-Lever Multifunctional Meta-Optics With High Longitudinal Tolerance. [PDF]

Adv Sci (Weinh)
We introduce a single‐layer, CMOS‐compatible metasurface that allows for polarization‐programmable, achromatic broadband dual‐mode imaging with high longitudinal tolerance. The twin‐lever design combines bright‐field focusing and vortex‐based edge‐enhanced imaging while managing axial intensity distribution from 488 to 633 nm.
Javed I, Kim K, Shah AR, Kang D, Kim J, Satti AJ, Liu X, Zubair M, Xiong J, Mehmood MQ, Rho J.   +10 more
europepmc   +2 more sources

Wavefront control system for the Keck telescope [PDF]

SPIE Proceedings, 1998
The laser guide star adaptive optics system currently being developed for the Keck 2 telescope consists of several major subsystems: the optical bench, wavefront control, user interface and supervisory control, and the laser system. The paper describes the design and implementation of the wavefront control subsystem that controls a 349 actuator ...
James M. Brase, Jong R. An, Kenneth Avicola, Barton V. Beeman, Donald T. Gavel, Randall L. Hurd, Brooks Johnston, Holger E. Jones, Thomas C. Kuklo, Claire E. Max, Scot S. Olivier, Kenneth E. Waltjen, James A. Watson   +12 more
openaire   +3 more sources