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On the possibility of ground-based direct imaging detection of extra-solar planets: The case of TWA-7
R. Neuhaeuser, W. Brandner, A. Eckart +5
We show that {\em ground-based} direct imaging detection of extra-solar planets is possible with current technology. As an example, we present evidence for a possible planetary com…
The ALFA Laser: Beam Relay and Control System
T. Ott, W. Hackenberg, S. Rabien +2
The ALFA laser subsystem uses a 4 watt continuous wave laser beam to produce an artificial guide star in the mesospheric sodium layer as a reference for wavefront sensing. In this…
The ALFA Laser and Analysis Tools
S. Rabien, T. Ott, W. Hackenberg +4
The optimal performance of adaptive optics systems can only be maintained if the wavefront reference is bright and compact. Experience has shown that both of these important criter…
The ALFA laser guide star: Operation and Results
R. Davies, A. Eckart, W. Hackenberg +4
The importance of laser guide stars to the practical usefulness of adaptive optics cannot be understated, and yet there are very few working systems. This contribution discusses th…