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检索条件"任意字段=Conference on Optics in Atmospheric Propagation and Adaptive Systems XIX"

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Self-focusing pin-like optical vortex beams resist atmospheric turbulence propagation for the space optical communication 3

Self-focusing pin-like optical vortex beams resist atmospher...

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3rd International conference on Laser, optics, and Optoelectronic Technology, LOPET 2023

作者： Xu, Yue Lan, Bin Liu, Chao Chen, Mo Sun, Haojun Zhang, You Xian, Hao National Key Laboratory of Optical Field Manipulation Science and Technology Chinese Academy of Sciences Sichuan Chengdu610209 China Key Laboratory on Adaptive Optics Chinese Academy of Sciences Sichuan Chengdu610209 China Institute of Optics and Electronics Chinese Academy of Sciences Sichuan Chengdu610209 China University of Chinese Academy of Sciences Beijing100049 China

ISBN: (纸本)9781510667624

Using the optical vortex beams (OVBs) can further improve the communication rate and spectrum utilization of the conventional space optical communication systems. In order to suppress the atmospheric turbulence effects in the space OVBs communication links, as well as to make the communication links simpler. We introduced the pin-like optical vortex beams (POVBs) that can dynamically self-focus during the free-space propagation. The POVBs have ability to counteract diffraction effects and atmospheric turbulence effects, and can maintain stable propagation with constant shape over long distances in the free-space. We theoretically analyzed the POVBs and experimentally demonstrated their stable propagation performance in the simulated atmospheric turbulence. © 2023 SPIE.

关键词： atmospheric turbulence

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Wavefront Sensing Requirements for High-Speed AO In Deep Turbulence

Wavefront Sensing Requirements for High-Speed AO In Deep Tur...

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conference on Unconventional Imaging, Sensing, and adaptive optics

作者： Dave, Harshil Ahn, Edwin Gibson, Steve Naval Res Lab Opt Sci Div 4555 Overlook Ave SW Washington DC 20375 USA Naval Surface Warfare Ctr Dahlgren Div Dahlgren VA 22485 USA Univ Calif Los Angeles Mech & AeroSp Engn Los Angeles CA 90095 USA

ISBN: (纸本)9781510679597;9781510679580

Applications utilizing free space beam propagation over long distances in the atmosphere require active sensors and beam shaping. New wavefront sensor designs promise improved performance in deep turbulence, but comprehensive comparisons of modern wavefront sensor designs within adaptive optics (AO) loops have yet to reveal winning system-level designs for adaptive optics systems capable of correcting deep turbulence. Here, we attempt to shed light on the problem using a comprehensive wave optics model to evaluate a least-squares based and interferometric-based wavefront sensing techniques, namely the Shack-Hartmann wavefront sensor and pupil plane off-axis digital holography in combination with optimal and adaptive predictive control. The Shack Hartmann wavefront sensor has been an established wavefront sensor that provides a measurement of the wavefront through fast measurements of the wavefront gradient and least squares reconstruction. Interferometric techniques such as digital holography provide higher resolution wavefront reconstruction and improved performance with strong turbulence but with stricter laser requirements and larger computation time. For an optimal AO design in a given application, there is a trade-off between reconstructed wavefront resolution and speed. In this paper, we use waveoptics simulation to qualitatively discuss the upper bounds of AO in deep turbulence, spatial resolution limitations of Shack-Hartmann and Digital Holography wavefront sensors. We show preliminary results of closed-loop AO performance in dynamic deep turbulence, inclusive of wind and limited spatial resolution. Additionally, we show a preliminary analysis of using predictive control to improve the temporal performance of an AO loop and compensate for latencies due to hardware.

关键词： adaptive optics Wavefront Sensing Shack-Hartmann Digital Holography atmospheric Turbulence

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propagation channel assessment for GEO feeder links

Propagation channel assessment for GEO feeder links

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International conference on Space Optical systems and Applications (ICSOS)

作者： Paillier, L. Lai-Tim, Yann Poiron, Alex Klotz, Emile Lefebvre, Sidonie Musso, Christian Fusco, Thierry Petit, Cyril Bonnefois, Aurelie Montmerle Chalali, Elyes Caillault, Karine Hespel, Laurent Krafft, Lea Montri, Joseph Quatresooz, Florian Poulenard, Sylvain Vedrenne, Nicolas Univ Paris Saclay DOTA ONERA F-92322 Chatillon France Univ Paris Saclay ONERA DOTA F-91120 Palaiseau France Univ Paris Saclay ONERA DOTA F-31400 Toulouse France Catholic Univ Louvain ICTEAM ELEN B-1348 Louvain Belgium Airbus Def & Space F-31402 Toulouse 4 France

ISBN: (纸本)9798350307900;9798350307917

Seen as the essential infrastructure supporting future high-throughput space data highways, Optical Feeder Links are still confronted with the need to manage atmospheric disruptions. Complex correction methods, including adaptive optics (AO), coding, interleaving and handover will be necessary to ensure the high link availability expected from a data providing service. Each of these correction methods might reap the benefits of an accurate propagation channel assessment either for real time optimization to feed control laws of the AO for short-term optimization in a minute timescale and for longer-term, typically dozen of minutes to few hours, to supervise the handover process. We present here the principal characteristics of ONERA's optical ground station FEELINGS data pipeline and draws perspectives on its exploitation for link availability prediction.

关键词： Optical ground station adaptive optics optical feeder link

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Branch-point compensation in extended-beacon adaptive optics

Branch-point compensation in extended-beacon adaptive optics

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conference on Unconventional Imaging, Sensing, and adaptive optics

作者： Kalensky, Matthew Burrell, Derek J. Spencer, Mark F. Banet, Matthias T. Oesch, Denis W. Getts, Darren Naval Surface Warfare Ctr Integrated Engagement Syst Dept Dahlgren Div Dahlgren VA 22448 USA Ben Gurion Univ Negev Unit Photon & Electroopt Engn Beer Sheva Israel Off Secretary Def Res & Engn Joint Directed Energy Transit Off Washington DC 20301 USA Air Force Res Lab Directed Energy Directorate Albuquerque NM 87108 USA Leidos Albuquerque NM 87106 USA

ISBN: (纸本)9781510679597;9781510679580

In this paper, we use wave-optics simulations to explore laser propagation system performance. We accomplish this by creating a trade space where we vary turbulence conditions as well as beacon size from a point-source beacon to an extended-source beacon with an object Fresnel number, N-obj, of 20. We explore performance when we employ no compensation, perfect phase compensation, and perfect full-phase compensation. The results of this trade space allow us to arrive at three main conclusions. First, if we have either a point-source beacon or a very small extended-source beacon and turbulence is strong, we get a significant improvement in performance using full-phase compensation compared to least-squares compensation and no compensation. If turbulence is weak, we see similar performance with least-squares and full-phase compensation, however, both are significantly improved over the no compensation case. Second, in strong turbulence conditions, there will be a very large number of turbulence-induced branch points. If left uncompensated, these turbulence-induced branch points will result in a major reduction in performance. Lastly, when the extended-source beacon is large, the associated rough-surface-scattering-induced phase aberrations will corrupt the compensation to the point where the drawbacks of compensating for surface-roughness-induced aberrations significantly outweigh the benefits of compensating for turbulence-induced aberrations. These results (1) inform researchers looking to conduct extended-source-beacon adaptive optics and (2) motivate research to explore methods for speckle mitigation in adaptive-optics systems.

关键词： branch points adaptive optics hidden phase extended beacons atmospheric optics

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Comparative Evaluation of Optical Turbulence and Extinction Instruments to High-Energy Laser atmospheric propagation

Comparative Evaluation of Optical Turbulence and Extinction ...

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conference on Unconventional Imaging, Sensing, and adaptive optics

作者： Bates, Evan M. Azarian, Adrian Beason, Melissa Bernath, Robert Burrette, Kevin Filkoski, William L. Fiorino, Steven Hubble, David Jeske, Brett Kaestel, Juergen Lamoureux, April McCammon, Jordan Pogue, Conor Pudog, Dominik Rata, Yogendra Salfer-Hobbs, Matthew Naval Surface Warfare Ctr Dahlgren Div NSWCDD Dahlgren VA 22448 USA Fraunhofer Inst Optron Syst Technol & Image Explo Karlsruhe Germany US Air Force Inst Technol AFIT Wright Patterson AFB OH 45433 USA Townes Inst Sci & Technol Expt Facil TISTEF Merritt Isl FL USA Def Sci & Technol Lab DSTL Salisbury Wilts England Naval Informat Warfare Ctr NIWC Pacific San Diego CA USA Def Res & Dev Canada DRDC Ottawa ON Canada German Aerosp Ctr DLR Cologne Germany Appl Res Solut ARS San Antonio TX USA

ISBN: (纸本)9781510679597;9781510679580

There are many challenges in characterizing open-air laser propagation. Varying measurement methodologies with diverse instrumentation can provide contradictory results for both optical turbulence and extinction. This paper assesses instrumentation accuracy w.r.t. a propagating laser and explores the optimal experimental setup. Accordingly, an open-air experiment was conducted to characterize the atmosphere and high-energy laser (HEL) propagation with commonly deployed instrumentation. Presented here is a comparative evaluation of the instrumentation results to far-field HEL measurements. The differential image motion monitor (DIMM) and the wide angle tele-radiometric transmissometer (WATT) provided measurements with the lowest mean percent error for optical turbulence and extinction, respectively. This suggests that path-integrated dual-sided instrumentation outperforms nodal measurements. However, it is found that nodal measurements perform best near and at the laser's aperture height if dual-sided instrumentation is not available. Additionally, a quality-control routine is outlined for all deployed instruments considered in the evaluation. The experimental results in this paper yield instrumentation performance for characterizing static laser propagation over land. Further research is recommended to assess instrumentation over longer optical paths both static and dynamic.

关键词： Optical turbulence scintillation atmosphere extinction transmission scattering attenuation optical depth high-energy lasers directed energy test and evaluation performance metrics atmospheric propagation beam propagation surface layer laser beam profiling instrumentation

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Characterization of infrared laser beam through atmospheric optical turbulence in laboratory environment 35

Characterization of infrared laser beam through atmospheric ...

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conference on Free-Space Laser Communications XXXV

作者： Coronel, Juan Elayoubi, Karim Al Ahmadi, Asma Al Hosani, Safa Al Blooshi, Ali Al Ameria, Reem Cordette, Steevy Bouchalkha, Abdellatif Alameri, Jawaher Matras, Guillaume Kasmi, Chaouki Technol Innovat Inst Directed Energy Res Ctr Abu Dhabi U Arab Emirates

ISBN: (纸本)9781510659315;9781510659322

The atmospheric effects on the propagation of light have been a matter of interest in fields like astronomy, meteorology, and optical communications where phase variations of wavefront have a significant impact in detection systems. The effects of the optical turbulence on the laser beam change from one region to another. This is linked to the atmospheric characteristics of the area (relative humidity, atmospheric pressure, wind, and temperature). Our research center is in a region with harsh atmospheric conditions for optical propagation. For this reason, it is important to measure and replicate these conditions in the laboratory environment. In this work, we present the results of our laboratory experimental setup to characterize infrared beam at 1064-nm using a turbulence chamber designed by our team. In our experimental setup, the transversal windspeed is varied in the turbulence generator chamber, and the beam centroid is measured after 4-m propagation path for different wavelengths and different optical powers. The beam is analyzed before and after the turbulence generation chamber. In this paper, we report our initial results in developing a laboratory experimental setup to emulate Middle East atmospheric conditions and compensate for these effects using an adaptive optics system.

关键词： Centroid beam propagation atmospheric turbulence generator image processing

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Development of an adaptive optical system for stabilizing laser radiation and correcting its turbulent distortions 16

Development of an adaptive optical system for stabilizing la...

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XVI International conference on Pulsed Lasers and Laser Applications 2023

作者： Antoshkin, L.V. Lavrinov, V.V. Lavrinova, L.N. Selin, A.A. V.E. Zuev Institute of Atmospheric Optics SB RAS 1 Academician Zuev square Tomsk634055 Russia

ISBN: (纸本)9781510671386

For studies of algorithms for stabilizing laser radiation during propagation in a randomly inhomogeneous medium, the problem of emulating atmospheric turbulence with the condition of repeatability of atmospheric parameters becomes topical. The second problem is to increase the speed and accuracy of the adaptive optical system by minimizing the error that occurs due to the displacement of the recorded beam image at the input aperture of the system during the time between frames caused by the turbulent atmosphere. A description is given of the stand of an adaptive optical system operating in the mode of emulating the tilts of the laser radiation wave front on a turbulent path with an additional loop for advanced correction of the beam tilt angle error due to the delay of the correcting Tip-Tilt mirror. © 2023 SPIE

关键词： atmospheric turbulence

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Effectiveness of adaptive optics for Coherent Laser Communications in atmospheric Turbulence 5

Effectiveness of Adaptive Optics for Coherent Laser Communic...

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conference on Environmental Effects on Light propagation and adaptive systems V

作者： Toselli, Italo Gladysz, Szymon Fraunhofer IOSB Fraunhofer Inst Optron Syst Technol & Image Explo Gutleuthausstr 1 D-76275 Ettlingen Germany

ISBN: (纸本)9781510655362;9781510655355

We theoretically investigate how adaptive optics (AO) can reduce symbol error probability (SEP) of free-space optical communications systems based on phase-shift keying heterodyne coherent receivers. In our analysis we use an updated model for describing the optical turbulence-induced fading present in coherent communications systems and it is assumed that AO is implemented at the receiver side. We consider the ideal case of partial phase conjugation, or in other words, we assume that the Zernike modes (up to the specific number N-modes) can be corrected with 100% accuracy. Results show that removal of several modes from the turbulence-affected wavefront allows to reach values of SEP that are typically required in coherent laser communications.

关键词： atmospheric turbulence optical system performances coherent laser communications

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Strategies for Correction of atmospheric and Underwater Effects on Laser Communications systems

Strategies for Correction of Atmospheric and Underwater Effe...

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propagation Through and Characterization of atmospheric and Oceanic Phenomena, pcAOP 2022

作者： Gladysz, Szymon Fraunhofer IOSB Ettlingen Fraunhofer Institute of Optronics System Technologies and Image Exploitation Gutleuthausstr. 1 Ettlingen76275 Germany

The adaptive optics Research Group at Fraunhofer IOSB has developed several novel solutions to problems faced by terrestrial, space-based and underwater laser-based communications. These solutions will be presented an...

ISBN: (纸本)9781557528209

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Hybrid adaptive optical system correcting turbulent distortions on the long atmospheric paths 4

Hybrid adaptive optical system correcting turbulent distorti...

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conference on Environmental Effects on Light propagation and adaptive systems IV

作者： Konyaev, P. A. Lukin, V. P. Gorbunov, I. A. Kulagin, O., V Inst Atmospher Opt SB RAS Tomsk Russia Inst Appl Phys RAS Nizhnii Novgorod Russia

ISBN: (数字)9781510645653

ISBN: (纸本)9781510645653;9781510645646

Approaches to constructing a mock-up of a system for focusing laser radiation on distant objects using both adaptive optics elements and nonlinear-optical wave-front reversal methods providing compensation for turbulent distortions are considered. Numerical calculations were preliminarily performed, in which the split-step method was used as a numerical method for solving a second-order partial differential wave equation for the complex amplitude of the wave field of a laser beam. This method, combined with methods of spectral-phase Fourier transforms and statistical tests, is the most effective way to obtain reliable quantitative results for solving engineering problems of atmospheric wave optics. Quantitative data are obtained on the effect of turbulent atmospheric distortions along propagation paths on the main parameters of coherent laser beams - focusing, effective average radius, and the proportion of the beam energy in its diffraction spot. The preliminary results obtained of the system mock-up performance confirm the conclusions of the theory.

关键词： adaptive optics phase conjugation wave-front reversal wave-front sensor

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