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Graphene Metasurface for THz Wavefront Control
JSAP-OSA Joint Symposia 2014 Abstracts, 2014Terahertz (THz) technology is now becoming more important with the potential applications in biochemical sensing, security detection, and high-speed communication. However, because of lack of active materials for THz wave, wave control, e.g. intensity and phase distribution, is still challenging.
Takumi Yatooshi +2 more
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FPGA-accelerated adaptive optics wavefront control
SPIE Proceedings, 2014The speed of real-time adaptive optical systems is primarily restricted by the data processing hardware and computational aspects. Furthermore, the application of mirror layouts with increasing numbers of actuators reduces the bandwidth (speed) of the system and, thus, the number of applicable control algorithms.
S. Mauch +6 more
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High-precision system for wavefront control
SPIE Proceedings, 2000Wavefront control is a key issue for developing different systems including: lasers (for various applications: isotopic separation, femto second solid state lasers, micro lithography...), imaging through turbulent media, ophthalmology... For these purposes, we have developed an adaptive optics system that can achieve wavefront very high precision ...
Pascal Jagourel +2 more
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Wavefront Control Optimization using Adaptive Filters
Adaptive Optics, 1996A key component in any close-loop adaptive optics (AO) system is the algorithm which converts signals from the wavefront sensor into commands to the correcting element. Much work has recently been devoted to the study of the optimal implementation of this algorithm, both in the theoretical [1, 2] and practical [3] domains.
M. Lloyd-Hart, T. Rhoadarmer
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Unified coronagraph and wavefront control design
SPIE Proceedings, 2011Numerous coronagraph designs for high-contrast imaging in space have been proposed, differentiated by various performance metrics, such as throughput, inner working angle, bandwidth, ease of implementation (a surrogate for cost), sensitivity, and robustness.
N. Jeremy Kasdin +4 more
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Wavefront Reconstruction and Control Systems
1998Abstract The control system is the vital link between the wave front sensor and the wavefront corrector in all adaptive optics systems. Its function is to convert the wavefront measurements made by the sensor into a set of commands that are applied to the wavefront corrector to satisfy a suitable performance criterion, such as minimizing
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Experiments On Wavefront Control Using Wavefront Sensing And Hill Climbing Techniques
SPIE Proceedings, 1989A number of experiments have been made with two adaptive optical systems. A 19 element deformable mirror with serial hilt-climbing control system is used to correct static wavefront errors. A system with 21-element deformable mirror and real-time wavefront sensing with shearing interferometer is used to correct dynamic errors.
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Phase-Diverse Wavefront Sensing and Control
Frontiers in Optics 2008/Laser Science XXIV/Plasmonics and Metamaterials/Optical Fabrication and Testing, 2008Improved computational capabilities render phase-diverse wavefront sensing to be a viable choice for selected adaptive-optics applications. Phase diversity acquires informative data with simple optical hardware, works with low-contrast extended scenes, and accommodates wavefront discontinuities.
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Wavefront Reconstruction and Control
2022Robert K. Tyson, Benjamin W. Frazier
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