Adaptive Optics in Astronomy

Thompson, Laird A.

doi:10.1063/1.881406

Cited by 30 publications

(15 citation statements)

References 25 publications

(8 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…256 I SPIE Vol. 2534 h(km) 5 10 15 20 25 6. CONCLUSIONS The typical night-time C2-profi1e above Mauna Kea is composed of an underlying background (Fig.…”

Section: Definition Of An Average C Profilementioning

confidence: 98%

<title>Profiles of nighttime turbulence above Mauna Kea and isoplanatism extension in adaptive optics</title>

Racine

Ellerbroek²

1995

SPIE Proceedings

View full text Add to dashboard Cite

We use4l4 turbulence profiles obtained by scidar over 20 nights to characterize the structure of the nighttime free atmosphere above Mauna Kea and to examine the isoplanatic patch enlargement that can be achieved in adaptive optics by conjugating the deformable mirror (DM) to the seeing layers. It is found that the typical night-time profile is composed of an underlying background of turbulence upon which are often superposed only one or two thin dominant layers. Low level turbulence is weak at the site. The turbulence structure is such that conjugation of a DM to turbulence rather than to the telescope entrance pupil increases the size of the isoplanatic patch by a factor of two (median); much larger gains are occasionally possible. When a single dominant layer is present, which occurs some 60 percent of the time, conjugation of the DM to that thin layer would typically reduce t he seeing spread angle by a factor of two over a field of view of many arcmins. These results should be useful in the design and evaluation of AO systems for the site.

show abstract

“…256 I SPIE Vol. 2534 h(km) 5 10 15 20 25 6. CONCLUSIONS The typical night-time C2-profi1e above Mauna Kea is composed of an underlying background (Fig.…”

Section: Definition Of An Average C Profilementioning

confidence: 98%

<title>Profiles of nighttime turbulence above Mauna Kea and isoplanatism extension in adaptive optics</title>

Racine

Ellerbroek²

1995

SPIE Proceedings

View full text Add to dashboard Cite

show abstract

“…The Lick Observatory adaptive optics system (2) is mounted at the f117 Cassegrain focus of the 3m Shane Telescope (12).…”

Section: System Descriptionmentioning

confidence: 99%

“…Adaptive optics systems which sense and correct atmospheric aberrations were proposed by Babcock in 1953 (1). Approximately 10 such systems are now installed on astronomical telescopes (2), including one developed at Lawrence Livermore National Laboratory (LLNL) for the 3 m Shane Telescope at Lick Observatory (3,4). These systems use a natural star as reference beacon.…”

Section: Introductionmentioning

confidence: 99%

First significant image improvement from a sodium-layer laser guide star adaptive optics system at Lick Observatory

et al. 1997

View full text Add to dashboard Cite

“…In certain applications, however, rigid materials may not provide the only solution to structural problem: adaptive optics is such an application [67]. Adaptive optics have com-monly been constructed by assembling smaller, rigid elements that can be moved independently to modify characteristics [68]. Elastomers are well suited as materials for similar systems.…”

Section: Elastomeric Materials For Microsystemsmentioning

confidence: 99%

Microfabrication, Microstructures and Microsystems

Qin

Xia

Rogers

et al. 1998

Topics in Current Chemistry

135

View full text Add to dashboard Cite

This review gives a brief introduction to materials and techniques used for microfabrication. Rigid materials have typically been used to fabricate microstructures and systems. Elastomeric materials are becoming attractive, and may have advantages for certain types of applications. Photolithography is the most commonly used technique for the fabrication of structures for microelectronic circuits, microelectromechanical systems, microanalytical devices and micro-optics. Soft lithography represents a set of non-photolithographic techniques: it forms micropatterns of self-assembled monolayers (SAMs) by contact printing and generates microstructures of polymers by contact molding. The aim of this paper is to illustrate how non-traditional materials and methods for fabrication can yield simple, cost-effective routes to microsystems, and now they can expand the capabilities of these systems.

show abstract

Adaptive Optics in Astronomy

Cited by 30 publications

References 25 publications

<title>Profiles of nighttime turbulence above Mauna Kea and isoplanatism extension in adaptive optics</title>

<title>Profiles of nighttime turbulence above Mauna Kea and isoplanatism extension in adaptive optics</title>

First significant image improvement from a sodium-layer laser guide star adaptive optics system at Lick Observatory

Microfabrication, Microstructures and Microsystems

Contact Info

Product

Resources

About