%0 Journal Article %T 20 W and 50 W solid-state sodium beacon guidestar laser systems for the Keck I and Gemini South Telescopes %A Hankla, Allen K. %A Adkins, Sean M. %A d'Orgeville, Céline %J Proceedings of SPIE %V 6272 %N 1 %P 62721G-62721G-9 %@ 0277-786X %D 2006-06-14 %I SPIE %~ DeepDyve