Field Guide to Adaptive Optics, Second Edition

Tyson, Robert K.; Frazier, Benjamin W.

doi:10.1117/3.923078

Cited by 29 publications

(16 citation statements)

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“…If the slope of the line a = 5/3, then the phase aberration is indeed representative of physical turbulence 3 . The value of r 0 may also be inferred from the fit via Equation 4.…”

Section: Kolmogorov Phase Platesmentioning

confidence: 99%

Lithographic manufacturing of adaptive optics components

Scott

Jean

Johnson

et al. 2017

Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems

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Adaptive optics systems and their laboratory test environments call for a number of unusual optical components. Examples include lenslet arrays, pyramids, and Kolmogorov phase screens. Because of their specialized application, the availability of these parts is generally limited, with high cost and long lead time, which can also significantly drive optical system design. These concerns can be alleviated by a fast and inexpensive method of optical fabrication. To that end, we are exploring direct-write lithographic techniques to manufacture three different custom elements. We report results from a number of prototype devices including 1, 2, and 3 wave Multiple Order Diffractive (MOD) lenslet arrays with 0.75 mm pitch and phase screens with near Kolmogorov structure functions with a Fried length r 0 around 1 mm. We also discuss plans to expand our research to include a diffractive pyramid that is smaller, lighter, and more easily manufactured than glass versions presently used in pyramid wavefront sensors. We describe how these components can be produced within the limited dynamic range of the lithographic process, and with a rapid prototyping and manufacturing cycle. We discuss exploratory manufacturing methods, including replication, and potential observing techniques enabled by the ready availability of custom components.

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“…If the slope of the line a = 5/3, then the phase aberration is indeed representative of physical turbulence 3 . The value of r 0 may also be inferred from the fit via Equation 4.…”

Section: Kolmogorov Phase Platesmentioning

confidence: 99%

Lithographic manufacturing of adaptive optics components

Scott

Jean

Johnson

et al. 2017

Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems

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“…The influence functions are modeled as Gaussian functions 17 and the actuator spacing is set to match the highest dominate spatial frequency identified using the two-dimensional (2-D) FFT plot of the primary mirror segment. In Sec.…”

Section: Segmented Mirror Telescope Woofertweeter Modeling and Controlmentioning

confidence: 99%

Correction of an active space telescope mirror using a deformable mirror in a woofer-tweeter configuration

Allen

Kim

Agrawal

2016

J. Astron. Telesc. Instrum. Syst

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, "Correction of an active space telescope mirror using a deformable mirror in a woofer-tweeter configuration," J. Astron. Abstract. The Naval Postgraduate School's segmented mirror telescope (SMT) was developed using prototype silicon carbide active hybrid mirror technology to demonstrate lower cost and rapid manufacture of primary mirror segments for a space telescope. The developmental mirror segments used too few actuators limiting the ability to adequately correct the surface figure error. To address the unintended shortfall of the developmental mirrors, a deformable mirror is added to the SMT and control techniques are developed. The control techniques are similar to woofer-tweeter adaptive optics, where the SMT segment represents the woofer and the deformable mirror represents the tweeter. The optical design of an SMT woofer-tweeter system is presented, and the impacts of field angle magnification on the placement and size of the deformable mirror are analyzed. A space telescope woofer-tweeter wavefront control technique is proposed using a global influence matrix and closed-loop constrained minimization controller. The control technique simultaneously manipulates the woofer and tweeter mirrors. Simulation and experimental results demonstrate a significant improvement in wavefront error of the primary mirror and the control technique shows significant wavefront error improvement compared to sequentially controlling the woofer and tweeter mirrors. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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“…Another important DM parameter is the actuator stroke. The required actuator stroke (range of motion of each actuator) is directly proportional to the strength (typically measured in wavelengths) of the aberration to be corrected [11]. Typical DM actuator strokes range from 3 to 4 micrometers [11].…”

Section: Deformable Mirrorsmentioning

confidence: 99%

“…The required actuator stroke (range of motion of each actuator) is directly proportional to the strength (typically measured in wavelengths) of the aberration to be corrected [11]. Typical DM actuator strokes range from 3 to 4 micrometers [11]. In this thesis, an AOX continuous surface (349 discrete actuator, 4 micrometer stroke) DM was utilized.…”

Section: Deformable Mirrorsmentioning

confidence: 99%

Reducing the Surface Performance Requirements of a Primary Mirror by Adding a Deformable Mirror in its Optical Path

Villalba¹

2015

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instruction, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to ABSTRACT (maximum 200 words)In recent years, carbon fiber reinforced polymer (CFRP) mirrors been proposed for use in future imaging satellites. Compared to traditional glass-based mirrors, CFRP mirrors offer reduced manufacturing times, lower coefficients of thermal expansion, lower areal density, and higher strength-to-weight ratios. Shorter manufacturing times promise to reduce program schedule requirements and cost. These advantages come at the expense of surface quality, which results in wavefront errors that are outside of the diffraction limit for optical imaging. To compensate for the reduced surface quality of CFRP mirrors, a deformable mirror (DM) is required in the optical path. During this research, the surface quality of a CFRP mirror was evaluated to establish a root-mean-square (RMS) error threshold for the DM corrections. An integral DM control law that employed a constrained least-squares solution was utilized to reduce the overall system wavefront error to below the specified CFRP error threshold. The application of this control law yielded a 38% reduction in RMS wavefront error (as compared to the CFRP error threshold), thus reducing the CFRP RMS surface performance requirements by the same amount. Reducing the surface performance requirements of CFRP mirrors is a critical step toward employing these mirrors in future imaging satellites. Submitted in partial fulfillment of the requirements for the degree of SUBJECT TERMS MASTER OF SCIENCE IN ASTRONAUTICAL ENGINEERINGfrom the NAVAL POSTGRADUATE SCHOOL December 2015Author: Ernesto R. Villalba

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Field Guide to Adaptive Optics, Second Edition

Cited by 29 publications

References 0 publications

Lithographic manufacturing of adaptive optics components

Lithographic manufacturing of adaptive optics components

Correction of an active space telescope mirror using a deformable mirror in a woofer-tweeter configuration

Reducing the Surface Performance Requirements of a Primary Mirror by Adding a Deformable Mirror in its Optical Path

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