A characterization of MFBD performance with partial adaptive optics compensation

2020 ◽  
Author(s):  
Richard B. Holmes ◽  
Michael Werth
Keyword(s):  
Adaptive Optics

Laboratory characterization of a Foucault-like wavefront sensor for adaptive optics

1998 ◽  
Author(s):  
Armando Riccardi ◽  
N. Bindi ◽  
Roberto Ragazzoni ◽  
Simone Esposito ◽  
Paolo Stefanini
Keyword(s):  
Adaptive Optics ◽  
Wavefront Sensor ◽  
Laboratory Characterization

scholarly journals Kepler-411: a four-planet system with an active host star

2019 ◽  
Vol 624 ◽  
pp. A15 ◽  
Author(s):  
L. Sun ◽  
P. Ioannidis ◽  
S. Gu ◽  
J. H. M. M. Schmitt ◽  
X. Wang ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Detailed Characterization ◽  
Dynamical Interaction ◽  
Transiting Planets ◽  
Imaging Results ◽  
Adaptive Optics Imaging ◽  
Dynamical Simulations ◽  
Mutual Inclination ◽  
Rocky Planets

We present a detailed characterization of the Kepler-411 system (KOI 1781). This system was previously known to host two transiting planets: one with a period of 3 days (R = 2.4 R⊕; Kepler-411b) and one with a period of 7.8 days (R = 4.4 R⊕; Kepler-411c), as well as a transiting planetary candidate with a 58-day period (R = 3.3 R⊕; KOI 1781.03) from Kepler photometry. Here, we combine Kepler photometry data and new transit timing variation (TTV) measurements from all the Kepler quarters with previous adaptive-optics imaging results, and dynamical simulations, in order to constrain the properties of the Kepler-411 system. From our analysis, we obtain masses of 25.6 ± 2.6 M⊕ for Kepler-411b and 26.4 ± 5.9 M⊕ for Kepler-411c, and we confirm the planetary nature of KOI 1781.03 with a mass of 15.2 ± 5.1 M⊕, hence the name Kepler-411d. Furthermore, by assuming near-coplanarity of the system (mutual inclination below 30°), we discover a nontransiting planet, Kepler-411e, with a mass of 10.8 ± 1.1 M⊕ on a 31.5-day orbit, which has a strong dynamical interaction with Kepler-411d. With densities of 1.71 ± 0.39 g cm−3 and 2.32 ± 0.83 g cm−3, both Kepler-411c and Kepler-411d belong to the group of planets with a massive core and a significant fraction of volatiles. Although Kepler-411b has a sub-Neptune size, it belongs to the group of rocky planets.

scholarly journals Keck Observatory Laser Guide Star Adaptive Optics Discovery and Characterization of a Satellite to the Large Kuiper Belt Object 2003 EL 61

2005 ◽  
Vol 632 (1) ◽  
pp. L45-L48 ◽  
Author(s):  
M. E. Brown ◽  
A. H. Bouchez ◽  
D. Rabinowitz ◽  
R. Sari ◽  
C. A. Trujillo ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Kuiper Belt ◽  
Laser Guide Star ◽  
Kuiper Belt Object ◽  
Guide Star ◽  
Laser Guide

scholarly journals Extreme adaptive optics testbed: performance and characterization of a 1024-MEMS deformable mirror

2006 ◽  
Author(s):  
Julia W. Evans ◽  
Katie Morzinski ◽  
Scott Severson ◽  
Lisa Poyneer ◽  
Bruce Macintosh ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Deformable Mirror

Novel Fabrication and Characterization of Diaphragm Micromirror Using ‘Bulk Lithography’

2012 ◽  
Author(s):  
Prasanna Gandhi ◽  
Shital Kamble ◽  
Kiran Bhole
Keyword(s):  
Adaptive Optics ◽  
Focal Length ◽  
Laser Doppler Vibrometer ◽  
Single Layer ◽  
Layer By Layer ◽  
Micro Fabrication ◽  
Wavefront Correction ◽  
Fabrication And Characterization ◽  
First Time

Adaptive optics is being explored actively for several applications such as wavefront correction in biomedical imaging (retinal surgery), variable focal length lenses, and adaptive zoom micromirrors. Diaphragm micromirrors have several advantages such as continuity in image and ease of fabrication. This paper investigates, for the first time to the best of our knowledge, fabrication of diaphragm micromirror using a recently proposed novel process of ‘Bulk Lithography’. In contrast to classical microstereolithography (MSL) processes of 3D layer-by-layer micro fabrication, bulk lithography fabrication is done by scanning of laser beam over the photopolymer resin of unconstraint depth in a single layer scan. The process has capability to fabricate smoothly varying thickness diaphragms for micromirrors. However, as a first step, this paper demonstrates fabrication of uniform thickness micromirrors coated with aluminum. Micromirrors are fabricated with air trapped beneath them which contributes to enhanced stiffness and low damping. Further fabricated micromirror is characterized using laser doppler vibrometer.

Fabrication and Characterization of MEMS Deformable Mirrors for Adaptive Optics

2006 ◽  
Author(s):  
Hyunkyu Park ◽  
David Horsley
Keyword(s):  
Adaptive Optics ◽  
Laser Doppler Vibrometer ◽  
Surface Shape ◽  
Analytical Models ◽  
Deformable Mirror ◽  
Experimental Measurements ◽  
Vision Science ◽  
Step Voltage ◽  
Fabrication And Characterization

A bimorph deformable mirror (DM) for use in ophthalmologic adaptive optics is presented. The fabrication process and the results of characterization of the DM are described. Interferometric measurements of the DM surface shape and voltage-to-displacement characteristics are shown. The response of the DM to a step voltage input is measured using a commercial laser Doppler vibrometer (LDV). Experimental measurements of the DM are compared with both finite-element and analytical models. Analysis of the experimental measurements compared to the theoretical model will be used to design and fabricate an optimized DM for vision science.

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