Large-aperture holographically corrected membrane telescope

Andersen, Geoff; Knize, R. J.; Palisoc, Art; Cassapakis, Costas

doi:10.1117/1.1481510

Cited by 12 publications

(13 citation statements)

References 14 publications

(14 reference statements)

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“…At the present time the ground telescopes with segmented primary mirrors largest in diameter (D=10 m) are the two telescopes Keck I and Keck II (see, for example, [2,[6][7][8]), commissioned in 1991 and 1996, respectively, and successfully operating at Hawaii. These are first large telescopes with segmented primary mirrors.…”

Section: Ground Telescopes Of 8-10 M Class and Future Projects (Up Tomentioning

confidence: 99%

“…However, it is problematic because there is a useless aperture zone near the membrane perimeter [44]. The line of development of large thin-film space mirrors is sufficiently elaborated for the cases of not high precision of specular surfaces [8,13,14]. Several of current designs for the NGST use large deployable sunshields 15-20 m in dimension and consisting of a 4-6-layer thin film for passive cooling the telescope.…”

Section: Super-light Mirrorsmentioning

confidence: 99%

“…The RTH correction is wavelength dependent and leads to residual phase errors when the wavelength of the image light deviates from the wavelength recording the hologram. While novel concepts have been proposed to extend the correctable bandwidth [68,69] and demonstration have indicated a high degree of correction over 50 to 300 nm [66] extended optical bandwidths, this affect can ultimately limit the correctable spectral bandwidth.Another drawback of the method of dynamic holography correction is the typical requirement of high resolution of the hologram (~2000 lines/mm [8]) and the requirement of diffraction efficiency close to 100%.In closing the review, we note the main tasks assumed to solve during execution of this contract:1. Development and fabrication by means of a galvanic plastic technique of a thin metallic mirror up to 150 mm in diameter and 1-0.3 mm in thickness.…”

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confidence: 99%

“…10-3 arcsec. The telescope operates in the spectral range 0.1-2.5 µm, the limit star magnitude m=30 [8]. On evidence derived from various publications the areal density of the primary mirror varies from 185 kg/m2 [11] to 345 kg/m2 [10].…”

mentioning

confidence: 99%

“…The distortions of the mirror were so large that the dimension of a focused image exceeded the diffraction limit approximately 100 times. However in the case of employment of a correctorhologram they obtained only 3-5-fold exceeding.In The authors of [8,72] have proposed the version of a space telescope with correction of aberrations of its primary mirror with the RTH technique. They believe such a telescope to be launched approximately in 2007 (the time of launching NGST) having in mind that its primary mirror will be of much more dimensions and the cost substantially lower as compared to that of the NGST primary.…”

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confidence: 99%

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Study Of Pre-Shaped Membrane Mirrors And Electrostatic Mirrors With Nonlinear-Optical Correction

Dimakov¹,

Emel'yanov²

2002

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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 instructions, 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 Washington Headquarters Services, Directorate for Information Operations and Reports, 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302, and to the Office of Management and Budget,, Washington, DC 20503. AGENCY USE ONLY (Leave blank)2. REPORT DATE This report results from a contract tasking Research Institute for Laser Physics as follows: The aim of this work is to improve low-weight membrane mirror characteristics intended for relaying laser communication beams in space. Such systems would use a non-linear-optical corrector to correct surface figure and other optical aberrations. The analytical part of this project is aimed at estimating the feasibility of designing the mirrors based on the pre-shaped membranes. This evaluation will give a clear understanding of the approaches to forming super-light mirrors as well as of the problems anticipated in creating this new generation of space mirrors. In the course of the experimental work, a low-weight mirror model based on the pre-shaped membrane will be fabricated, and its optical characteristics will be studied. It is expected that the characteristics predicted theoretically will be observed experimentally. The first quarterly report on project 2103p (ISTC 00-7032), entitled "Study of pre-shaped membrane mirrors and electrostatic mirrors with nonlinear-optical correction." Large telescopes and super light mirrors OverviewNowadays a number of scientific and practical fields of activity need solutions of the problems requiring high-resolution of both ground and space based telescopes with substantial space penetrating power, namely ones with large aperture mirrors.First of all, these high-resolution physical instruments are required for astronomic observations. For example, the National Research Council of the National Academy of Sciences of the USA states the strategic tasks of astronomic observations as follows: "We must use the universe as a laboratory -a unique laboratory -for probing the laws of physics in regimes not accessible on Earth, such as the very early universe or near the event horizon of a black hole." "We must search for life beyond the Earth and, if it is found, determine its nature and its distribution. And finally, we must develop a conceptual framework that accounts for all that we have observed," the report says [1]. Note that at present the requirements to a telescope for some tasks [2] are the resolution of the order of 10 -3 arcsec and space penetrating power of stars of the 35th-38th magnitude. This means that a primary mirror must be of the order of 100m in diameter.Obviously, high-resolution...

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Section: Ground Telescopes Of 8-10 M Class and Future Projects (Up Tomentioning

confidence: 99%

Section: Super-light Mirrorsmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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