Extrapolation method to extend the dynamic range of the Shack-Hartmann wave-front sensor - art. no. 68341Z

The maximum tolerable spot displacement of the Shack-Hartmann wave-front sensor is called dynamic range, and it is limited by the f-number of the micro-lens. It is well known that there is a trade-off between the sensitivity and the dynamic range, if the f-number is relatively short, a high dynamic range is achieved, but the corresponding sensitivity is degraded and vice versa. Extrapolation method could overcome the trade-off, since the extrapolation method is a simple algorithm that does not change the measurement configuration, there is no requirement for extra hardware, multiple measurements, or complicated algorithms. In this paper, we not only present the theory but also actually implement measurement of a highly aerated wave-front.