Closed-loop transferring characteristics of wavefront sensor noise in adaptive optical system
In this paper, the transferring characteristics of the detecting error of adaptive optical system (AOS) under real atmospheric turbulence are presented. A mathematic model for quantitative analysis is acquired. Results show that the residual error will increase due to the 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 included in the control of residual error besides other terms, it is demanded that the aberration of S H WFS calibrating optical system be very small.