Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-02-13
Astron.Astrophys. 418 (2004) 1179-1186
Astronomy and Astrophysics
Astrophysics
13 pages (5 pages of appendices), 6 figures to be published in A&A
Scientific paper
10.1051/0004-6361:20034090
We compare performances of ground-based single-mode and multimode (speckle) interferometers in the presence of partial Adaptive Optics correction of atmospheric turbulence. It is first shown that for compact sources (i.e. sources smaller than the Airy disk of a single telescope) not entirely resolved by the interferometer, the remarkable property of spatial filtering of single-mode waveguides coupled with AO correction significantly reduces the speckle noise which arises from residual wavefront corrugations. Focusing on those sources, and in the light of the AMBER experiment (the near infrared instrument of the VLTI), we show that single-mode interferometry produces a better Signal-to-Noise Ratio on the visibility than speckle interferometry. This is true for bright sources (K < 5), and in any case as soon as Strehl ratio of 0.2 is achieved. Finally, the fiber estimator is much more robust -- by two orders of magnitude -- than the speckle estimator with respect to Strehl ratio variations during the calibration procedure. The present analysis theoretically explains why interferometry with fibers can produce visibility measurements with a very high precision, 1% or less
Chelli Alain
Mège Pierre
Tatulli Eric
No associations
LandOfFree
Single-Mode versus multimode interferometry: a performance study does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Single-Mode versus multimode interferometry: a performance study, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Single-Mode versus multimode interferometry: a performance study will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-85020