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Multi Conjugate Adaptive Optics Test Bed For Horizontal Propagation
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Book Synopsis Multi-Conjugate Adaptive Optics Test-bed for Horizontal Propagation by :
Download or read book Multi-Conjugate Adaptive Optics Test-bed for Horizontal Propagation written by and published by . This book was released on 2009 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: Our program for the upgrade of the Naval Prototype Optical Interferometer with large telescopes and adaptive optics has produced a test-bed for the in system evaluation and testing of our MEMs adaptive optics components and system performances. We have already reported in recent publications the basic characteristics of the test-bed. In order to improve the capabilities of such laboratory set-up we have started an upgrade that aims at developing a Multi Conjugate Adaptive Optics (MCA) test-bed. This test bed is based on the use of multiple Liquid Crystal Spatial Light Modulators (LCSLMs) for producing different phase screens at different spatial locations within the set-up. Details of this new set-up are presented in another paper in these proceedings. This paper specifically deals with the analytic portion of the MCAO test-bed.
Book Synopsis Multi-Conjugate Adaptive Optics for the Compensation of Amplitude and Phase Distortions by : Peter N. Crabtree
Download or read book Multi-Conjugate Adaptive Optics for the Compensation of Amplitude and Phase Distortions written by Peter N. Crabtree and published by . This book was released on 2000-03-01 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two deformable mirrors (DMs) with finite conjugate ranges are investigated for compensating amplitude and phase distortions due to laser propagation through turbulent atmospheres. Simulations are performed based on Adaptive Optics (AO) for an Airborne Laser-type scenario. The Strehl ratio, the number of branch points in DM controls, and the number of iterations to convergence are used as figures of merit to evaluate performance of the Sequential Generalized Projection Algorithm that generates mirror commands. The results are ensemble averages over 32 realizations of the scintillated test fields for each value of the Rytov parameter within the test scenario. The Gaussian beam shape that optimizes the Strehl ratio is determined. The least squares two-DM Strehl, phase-only Strehl, least squares phase-only Strehl, and uncompensated Strehl are also determined for comparison. Finally, for the Strehl ratio versus Rytov parameter analysis the Strehl is also calculated beyond the telescope by propagating the pre-compensated laser wavefront back through the phase screens of the modeled atmosphere. Results from the more critical beyond- telescope Strehl analysis indicate that a two-DM AO system provides an increase in performance of approximately 0.1 in Strehl as compared to the phase-only system for the most severe simulated turbulence (theoretical log-amlitude variance of 1.0)
Book Synopsis Intensity Redistribution for Multiconjugate Adaptive Optics (postprint). by : Troy Rhoadarmer
Download or read book Intensity Redistribution for Multiconjugate Adaptive Optics (postprint). written by Troy Rhoadarmer and published by . This book was released on 2006 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: Multi-Conjugate Adaptive-Optical (MCAO) systems have been proposed as a means of compensating both intensity and phase aberrations in a beam propagating through strong-scintillation environments. Progress made on implementing a MCAO system at the Starfire Optical Range (SOR), Air Force Research Laboratory, Kirtland AFB, is discussed. As a preliminary step toward controlling a two Deformable Mirror (DM) system, the first-stage intensity redistribution experiment (FIRE) examines one aspect of an MCAO system-control and compensation of wavefront intensity. Two wavefront sensors (WFS) and a single DM are employed for this experiment. One WFS is placed conjugate to the DM while the second WFS is located at a distance which produces a desired fresnel number for the propagation between the WFSS. The WFS measurements are input to a Gerchberg-Saxton based control algorithm in order to determine the DM commands. The phase pattern introduces by the DM is chosen so propagation along the path between the two WFSS produces a desired a desired intensity profile at the second WFS. The second WFS is also used to determine the accuracy of the intensity redistribution and measure its effects on the wavefront phase. In the next phase of MCAO development, a second DM will be added conjugate to the second WFS in order to correct the remaining phase aberrations. The paper presents the setup and operation for FIRE along with initial laboratory results.
Book Synopsis Methods of Multi-conjugate Adaptive Optics for Astronomy by : Ralf Flicker
Download or read book Methods of Multi-conjugate Adaptive Optics for Astronomy written by Ralf Flicker and published by . This book was released on 2003 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Design and Progress Toward a Multi-conjugate Adaptive Optics System for Distributed Aberration Correction by : J. Tucker
Download or read book Design and Progress Toward a Multi-conjugate Adaptive Optics System for Distributed Aberration Correction written by J. Tucker and published by . This book was released on 2004 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: This article investigates the use of a multi-conjugate adaptive optics system to improve the field-of-view for the system. The emphasis of this research is to develop techniques to improve the performance of optical systems with applications to horizontal imaging. The design and wave optics simulations of the proposed system are given. Preliminary results from the multi-conjugate adaptive optics system are also presented. The experimental system utilizes a liquid-crystal spatial light modulator and an interferometric wave-front sensor for correction and sensing of the phase aberrations, respectively.
Book Synopsis Adaptive Optics Systems and Technology by :
Download or read book Adaptive Optics Systems and Technology written by and published by . This book was released on 2002 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Handbook of Optical Sensors by : Jose Luis Santos
Download or read book Handbook of Optical Sensors written by Jose Luis Santos and published by CRC Press. This book was released on 2014-10-29 with total page 722 pages. Available in PDF, EPUB and Kindle. Book excerpt: Handbook of Optical Sensors provides a comprehensive and integrated view of optical sensors, addressing the fundamentals, structures, technologies, applications, and future perspectives. Featuring chapters authored by recognized experts and major contributors to the field, this essential reference: Explains the basic aspects of optical sensors and the principles of optical metrology, presenting a brief historical review Explores the role of optical waveguides in sensing and discusses sensor technologies based on intensity and phase modulation, fluorescence, and plasmonic waves Describes wavefront sensing, multiphoton microscopy, and imaging based on optical coherence tomography Covers optical fiber sensing, from light guiding in standard and microstructured optical fibers to sensor multiplexing, distributed sensing, and fiber Bragg grating Offers a broad perspective of the field and identifies trends that could shape the future, such as metamaterials and entangled quantum states of light Handbook of Optical Sensors is an ideal resource for practitioners and those seeking optical solutions for their specific needs, as well as for students and investigators who are the intellectual driving force of optical sensing.
Download or read book Advanced Wavefront Control written by and published by . This book was released on 2003 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Tafeln der pilz-parasitäre n Krankheiten by :
Download or read book Tafeln der pilz-parasitäre n Krankheiten written by and published by . This book was released on 1930 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Implementation and Optimization of a Multi Conjugate Adaptive Optics Software System for Vision Research by :
Download or read book Implementation and Optimization of a Multi Conjugate Adaptive Optics Software System for Vision Research written by and published by . This book was released on 2005 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis High-Resolution Adaptive Optics Test-Bed for Vision Science by :
Download or read book High-Resolution Adaptive Optics Test-Bed for Vision Science written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We discuss the design and implementation of a low-cost, high-resolution adaptive optics test-bed for vision research. It is well known that high-order aberrations in the human eye reduce optical resolution and limit visual acuity. However, the effects of aberration-free eyesight on vision are only now beginning to be studied using adaptive optics to sense and correct the aberrations in the eye. We are developing a high-resolution adaptive optics system for this purpose using a Hamamatsu Parallel Aligned Nematic Liquid Crystal Spatial Light Modulator. Phase-wrapping is used to extend the effective stroke of the device, and the wavefront sensing and wavefront correction are done at different wavelengths. Issues associated with these techniques will be discussed.
Author :Michael T. Valley Publisher :SPIE-International Society for Optical Engineering ISBN 13 :9780819454904 Total Pages :286 pages Book Rating :4.4/5 (549 download)
Book Synopsis Target-in-the-loop: Atmospheric Tracking, Imaging, and Compensation by : Michael T. Valley
Download or read book Target-in-the-loop: Atmospheric Tracking, Imaging, and Compensation written by Michael T. Valley and published by SPIE-International Society for Optical Engineering. This book was released on 2004 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of SPIE present the original research papers presented at SPIE conferences and other high-quality conferences in the broad-ranging fields of optics and photonics. These books provide prompt access to the latest innovations in research and technology in their respective fields. Proceedings of SPIE are among the most cited references in patent literature.
Book Synopsis Amplitude Variations on the Extreme Adaptive Optics Testbed by :
Download or read book Amplitude Variations on the Extreme Adaptive Optics Testbed written by and published by . This book was released on 2007 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: High-contrast adaptive optics systems, such as those needed to image extrasolar planets, are known to require excellent wavefront control and diffraction suppression. At the Laboratory for Adaptive Optics on the Extreme Adaptive Optics testbed, we have already demonstrated wavefront control of better than 1 nm rms within controllable spatial frequencies. Corresponding contrast measurements, however, are limited by amplitude variations, including those introduced by the micro-electrical-mechanical-systems (MEMS) deformable mirror. Results from experimental measurements and wave optic simulations of amplitude variations on the ExAO testbed are presented. We find systematic intensity variations of about 2% rms, and intensity variations with the MEMS to be 6%. Some errors are introduced by phase and amplitude mixing because the MEMS is not conjugate to the pupil, but independent measurements of MEMS reflectivity suggest that some error is introduced by small non-uniformities in the reflectivity.
Book Synopsis Photonic Engineering by : Brian W. Bowe
Download or read book Photonic Engineering written by Brian W. Bowe and published by SPIE-International Society for Optical Engineering. This book was released on 2005 with total page 724 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of SPIE present the original research papers presented at SPIE conferences and other high-quality conferences in the broad-ranging fields of optics and photonics. These books provide prompt access to the latest innovations in research and technology in their respective fields. Proceedings of SPIE are among the most cited references in patent literature.
Book Synopsis Free-Space Laser Communications by : Arun K. Majumdar
Download or read book Free-Space Laser Communications written by Arun K. Majumdar and published by Springer Science & Business Media. This book was released on 2010-05-05 with total page 429 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a comprehensive tutorial on the emerging technology of free-space laser communications (FSLC). The book offers an all-inclusive source of information on the basics of FSLC, and a review of state-of-the-art technologies. Coverage includes atmospheric effects for laser propagation and FSLC systems performance and design. Free-Space Laser Communications is a valuable resource for engineers, scientists and students interested in laser communication systems designed for the atmospheric optical channel.
Book Synopsis Adaptive Optics for Industry and Medicine by : Christopher Dainty
Download or read book Adaptive Optics for Industry and Medicine written by Christopher Dainty and published by Imperial College Press. This book was released on 2008 with total page 519 pages. Available in PDF, EPUB and Kindle. Book excerpt: This proceedings volume presents the very latest developments in non-astronomical adaptive optics. This international workshop, the sixth in a biennial series, was the largest ever held and boasted significant involvement by industry. Adaptive optics is on the verge of being used in many products; indeed, at this meeting, the use of adaptive optics in DVD players was disclosed for the first time. Sample Chapter(s). Liquid Crystal Lenses For Correction Of Presbyopia (586 KB). Contents: Wavefront Correctors and Control: Liquid Crystal Lenses for Correction of Presbyopia (G Li & N Peyghambarian); Woofer-Tweeter Adaptive Optics (T Farrell & C Dainty); Wavefront Sensors: A Fundamental Limit for Wavefront Sensing (C Paterson); Direct Diffractive Image Simulation (A P Maryasov et al.); Adaptive Optics in Vision Science: A Study of Field Aberrations in the Human Eye (A V Goncharov et al.); Characterization of an AO-OCT System (J W Evans et al.); Adaptive Optics in Optical Storage and Microscopy: Commercialization of the Adaptive Scanning Optical Microscope (ASOM) (B Potsaid et al.); Towards Four Dimensional Particle Tracking for Biological Applications (H I Campbell et al.); Adaptive Optics in Lasers: New Results in High Power Lasers Beam Correction (A Kudryashov et al.); Adaptive Optics Control of Solid-State Lasers (W Lubeigt et al.); Adaptive Optics in Communication and Atmospheric Compensation: Fourier Image Sharpness Sensor for Laser Communications (K N Walker & R K Tyson); Adaptive Optics System for a Small Telescope (G Vdovin et al.); and other papers. Readership: Industry- and university-level researchers in optics and laser physics.
Book Synopsis International Aerospace Abstracts by :
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1999 with total page 974 pages. Available in PDF, EPUB and Kindle. Book excerpt:
