Figure 23

Figure 23

Model comparisons of NGS and LGS AO systems at J, H, and K. Input parameters include zenith pointing, average seeing, altitude conjugation, no wind, and a 30° galactic latitude and losses for telescope and the near-infrared imager in its 0.02" plate scale mode. The NGS model closely resembles the baseline system currently under development for Mauna Kea. All NGS/LGS model parameters were held the same except the LGS used a Near IR tip/tilt sensor and the NGS model used the facility WFS, working in the 0.4-0.8µm band, to sense tip/tilt.