22 July 2010 Modified telescope alignment procedure for improving the beam quality of the CHARA Telescopes
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Proceedings Volume 7734, Optical and Infrared Interferometry II; 773445 (2010); doi: 10.1117/12.857883
Event: SPIE Astronomical Telescopes + Instrumentation, 2010, San Diego, California, United States
Abstract
We present the procedure used to optically align the CHARA telescopes. We show that the beam quality, delivered by the CHARA telescopes E1, E2 and W2, is significantly better now than in 2008. RMS wavefront error is about 200 nm. The astigmatism observed in W1 is more likely due to a combination of a mechanical problem in the mounting and misalignment. We present wavefront quality results from four telescopes. Further beam quality improvements can be expected when the second part of the alignment procedure (tuning) will be carried out later this year.
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Laszlo Sturmann, Judit Sturmann, Theo A. ten Brummelaar, Harold A. McAlister, "Modified telescope alignment procedure for improving the beam quality of the CHARA Telescopes", Proc. SPIE 7734, Optical and Infrared Interferometry II, 773445 (22 July 2010); doi: 10.1117/12.857883; https://doi.org/10.1117/12.857883
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Telescopes

Wavefronts

Monochromatic aberrations

Mirrors

Visibility

Alignment procedures

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