Design of an holographic off-axis calibration light source for ARGOS at the LBTC. Schwab, W. Gassler, D. Peter, T. Blumchen, S. Aigner and A. Quirrenbach1st AO4ELT conference - Adaptive Optics for Extremely Large Telescopes, (2010) 04007DOI: https://doi.org/10.1051/ao4elt/201004007