We report on the design of an artificial light source for ARGOS, the multiple Rayleigh laser guide star (LGS) facility at the Large Binocular Telescope (LBT). Our light source mimics the expected night-time illumination of the adaptive secondary mirror (ASM) by the laser beacons very accurately and provides a way to check the achieved performance, allowing thorough testing of the system during day time. The optical design makes use of computer generated holograms (CGH) and strong aspheres to achieve a very small residual wavefront error. Additional structures on the CGH facilitate quick and precise alignment of the optics in the prime focus. We demonstrate that the scheme can be applied to the current European Extremely Large Telescope (E-ELT) design in a similar way.
|Title of host publication||1st International Conference on Adaptive Optics for Extremely Large Telescopes (AO4ELT)|
|Subtitle of host publication||proceedings|
|Editors||Y. Clenet, J. M. Conan, T. Fusco, G. Rousset|
|Place of Publication||France|
|Number of pages||5|
|Publication status||Published - 2010|
|Event||Conference on Adaptive Optics for Extremely Large Telescopes (1st : 2009) - Paris, France|
Duration: 22 Jun 2009 → 26 Jun 2009
|Conference||Conference on Adaptive Optics for Extremely Large Telescopes (1st : 2009)|
|Period||22/06/09 → 26/06/09|
Bibliographical noteCopyright the Author(s) 2010. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.
Schwab, C., Gässler, W., Peter, D., Blümchen, T., Aigner, S., & Quirrenbach, A. (2010). Design of an holographic off-axis calibration light source for ARGOS at the LBT. In Y. Clenet, J. M. Conan, T. Fusco, & G. Rousset (Eds.), 1st International Conference on Adaptive Optics for Extremely Large Telescopes (AO4ELT): proceedings (pp. 04007-1-04007-5). France: EDP Sciences. https://doi.org/10.1051/ao4elt/201004007