1976
DOI: 10.1364/ao.15.000611
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Coherent optical adaptive techniques: design and performance of an 18-element visible multidither COAT system

Abstract: Coherent Optical Adaptive Techniques (COAT) offer promise for overcoming the deleterious effects of phase distortions experienced by optical beams propagating in a turbulent and absorbing atmosphere. An 18-element, visible wavelength, multidither COAT system is described. The all solid-state servosystem design was based on the results of an extensive computer simulation. The optical system uses a 0.488-microm argon laser and an array of beam splitters, phase shifters, and beam combiners (termed a phasor matrix… Show more

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Cited by 55 publications
(10 citation statements)
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“…It is easy to derive S(icz)i.kJcos(zzi)/2.k)/2)(/(,z)d.zi (4) We defme as usually the spectral density F of the quantity y (y(K1,z)y(K2,z))= S(K+K2).F(K1,z) (5) and obtain for the phase It is easy to derive S(icz)i.kJcos(zzi)/2.k)/2)(/(,z)d.zi (4) We defme as usually the spectral density F of the quantity y (y(K1,z)y(K2,z))= S(K+K2).F(K1,z) (5) and obtain for the phase…”
Section: Basic Equations and Approximationsmentioning
confidence: 99%
“…It is easy to derive S(icz)i.kJcos(zzi)/2.k)/2)(/(,z)d.zi (4) We defme as usually the spectral density F of the quantity y (y(K1,z)y(K2,z))= S(K+K2).F(K1,z) (5) and obtain for the phase It is easy to derive S(icz)i.kJcos(zzi)/2.k)/2)(/(,z)d.zi (4) We defme as usually the spectral density F of the quantity y (y(K1,z)y(K2,z))= S(K+K2).F(K1,z) (5) and obtain for the phase…”
Section: Basic Equations and Approximationsmentioning
confidence: 99%
“…11 This approach is very complex and requires high-bandwidth piston acuators. For the present RTA structure we found a control algorithm which uses only a single dither frequency.…”
Section: Cascading Elementary Beam Combinersmentioning
confidence: 99%
“…Hayes et al, 11 and Pearson et al 12 describe multisegment approaches, while Crawford et al, 13 Primmerman and Fouche, 14 Neufeld, 15 Hardy et al, 16 and Pearson and Hansen 17 describe deformable mirror systems. Presumably because the mirrors involved in these studies are generally smaller than those involved in the Large Space Telescope program, and because the characteristic times involved in counteracting atmospheric turbulence are many orders of magnitude shorter than the orbital frequency that governs the time variation of the thermal distortion of the telescope primary mirror, the experiments described in Refs.…”
Section: State-of-the-artmentioning
confidence: 99%
“…The subscript "/" denotes the summations with u nl ,v nl ,w nl in Eq. (12). Note that the second summations on the righthand sides of Eqs.…”
Section: Unit Load Influence Functionsmentioning
confidence: 99%
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