12/12/2016

Author: Franz Felberer, Imagine Eyes

Photonics West 2017, BIOS conference

In an Adaptive Optics (AO) system for imagine the eye the quality of the wavefront measurement is a key factor. During my Post-doc at Imagine Eyes we developed in cooperation with our colleagues from Imagine Optics a new approach to address this question.  

AO corrects wavefront errors to improve imaging quality in optical systems. An AO-system consist often of a SH-WFS (Shack–Hartmann wavefront sensor) and a DM (deformable mirror). The SH-WFS measures the local slopes of the wave front and calculates from this slopes iteratively the best fitting wavefront. The shape of the DM is then controlled by this information. Any error in the slope measurement (noise) will result in a residual wavefront error and hence in a reduced image quality.

The method is based on the fact that the wavefront has to be integrable and allows to quantify the error in the wavefront measurement. The integrable wavefront derived from the measured slopes is used to re-calculate the slopes. The difference between the re-calculated slopes and the measured slopes is identified as the none-integrable noise of the slopes measurement.

The final results will be presented at the coming BOIS conference in San Francisco 2017