A diffraction-limited F/2 1.5 meter diameter liquid mirror

Borra, E. F., Content, R., Drinkwater, M. J. and Szapiel, S. (1989) A diffraction-limited F/2 1.5 meter diameter liquid mirror. Astrophysical Journal, 346 L41-L44. doi:10.1086/185574

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Author Borra, E. F.
Content, R.
Drinkwater, M. J.
Szapiel, S.
Title A diffraction-limited F/2 1.5 meter diameter liquid mirror
Journal name Astrophysical Journal   Check publisher's open access policy
ISSN 0004-637X
1538-4357
Publication date 1989-11-01
Sub-type Article (original research)
DOI 10.1086/185574
Open Access Status File (Publisher version)
Volume 346
Start page L41
End page L44
Total pages 5
Place of publication Philadelphia, PA, United States
Publisher Institute of Physics Publishing
Language eng
Formatted abstract
The Airy-like pattern of a 1.5-m-diameter liquid mirror has been observed directly. Measurements show that the dark rings of the Airy pattern are at the predicted locations, the first ring being at a radius of 0".11 arcsec. Interferometric data give Strehl ratios of order 0.8 and rms surface deviations of order β/20, confirming what the direct observation of the Airy pattern indicates: that the mirror is essentially diffraction-limited. Direct observations of the point-spread function also show that the mirror does not suffer an excessive amount of scattered light. The optical path of the test light beam goes through 23 optical surfaces, used for testing purposes, from pinhole to detector; therefore, the liquid mirror alone should have a surface quality actually better than indicated by the above measurements.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Mathematics and Physics
 
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