Closed-loop transferring characteristics of shack-hartmann wavefront sensor noise in adaptive optical system

In this paper, the transferring characteristics of detecting error to Adaptive Optical System (AOS) under realistic atmospheric turbulence are researched. Results show that the residual error will be increased due to beacon light’s decreasing when Shack-Hartmann wavefront sensor is used in probing very low-light-level object. Because a constant term caused by sky background light is concluded in the control residual error besides another terms, it is demanded that the aberration of S-H WFS calibrating optical system be very small.