Near-infrared adaptive optics observations of galaxy clusters: Abell 262   at z=0.0157, J1836.3CR at z=0.414, and PKS 0743-006 at z=0.994
  We report on high angular resolution near-infrared (NIR) observations of three galaxy clusters at different redshifts using adaptive optics (AO). In the case of the barred spiral \object{UGC 1347} in Abell 262 we presented the first AO results obtained using a laser guide star. The observations have been carried out with the MPE/MPIA adaptive optics laser guide star system ALFA and the ESO AO system ADONIS combined with the SHARP II+ camera built at MPE. The three clusters are well suited for high resolution investigations since bright field stars for tip-tilt or wavefront sensing are located close to the line of sight to cluster galaxies. In summary our high angular resolution NIR data combined with other information clearly indicates star formation activity or interaction between cluster members at all three redshifts. The results and implications for future high angular resolution adaptive optics observations are discussed in the framework of current galaxy and cluster evolution models. 
W. Hackenberg (MPE), A. Eckart, (Uni. of Cologne), R. I. Davies (MPE),   S. Rabien (MPE), T. Ott (MPE), M. Kasper (MPIA), S....