Atmospheric dispersion compensation for ELTs

E. Atad-Ettedgui; A. S. Goncharov

doi:10.1117/12.801274

22 April 2008 Atmospheric dispersion compensation for ELTs

E. Atad-Ettedgui, A. S. Goncharov

Proceedings Volume 6986, Extremely Large Telescopes: Which Wavelengths? Retirement Symposium for Arne Ardeberg; 69860H (2008) https://doi.org/10.1117/12.801274
Event: Extremely Large Telescopes: Which Wavelengths? Retirement Symposium for Arne Ardeberg, 2007, Lund, Sweden

Abstract

This paper summarises the problems related to atmospheric dispersion (AD), both active (angular dispersion due to change in the telescope zenith angles) and adaptive (the atmospheric turbulence depends on wavelength since the refractive index and r₀ are also wavelength dependent). We compare the AO effects and its compensation by deformable mirrors (achromatic by definition and incapable of compensating the atmospheric dispersion) using GLAO and LTAO with those of the atmospheric dispersion. We present preliminary optical designs for ADCs in Euro50 and E-ELT to compensate the zenith dependence dispersion of the atmosphere.

Citation Download Citation

E. Atad-Ettedgui and A. S. Goncharov "Atmospheric dispersion compensation for ELTs", Proc. SPIE 6986, Extremely Large Telescopes: Which Wavelengths? Retirement Symposium for Arne Ardeberg, 69860H (22 April 2008); https://doi.org/10.1117/12.801274

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