Shack-Hartmann sensor improvement using optical binning

TL;DR

This paper introduces an improved Shack-Hartmann wavefront sensor design using optical binning, which reduces detector pixel requirements, noise, and latency, enhancing performance especially for astronomical adaptive optics.

Contribution

The paper proposes a novel optical binning approach for Shack-Hartmann sensors, significantly reducing detector pixel count and noise impact compared to traditional designs.

Findings

Optical binning reduces detector pixels needed.

Sensor shows improved performance in simulations.

Design is especially effective for astronomical adaptive optics.

Abstract

We present a design improvement for a recently proposed type of Shack-Hartmann wavefront sensor that uses a cylindrical (lenticular) lenslet array. The improved sensor design uses optical binning and requires significantly fewer detector pixels than the corresponding conventional or cylindrical Shack-Hartmann sensor, and so detector readout noise causes less signal degradation. Additionally, detector readout time is significantly reduced, which reduces the latency for closed loop systems, and data processing requirements. We provide simple analytical noise considerations and Monte-Carlo simulations, and show that the optically binned Shack-Hartmann sensor can offer better performance than the conventional counterpart in most practical situations, and our design is particularly suited for use with astronomical adaptive optics systems.