[15p-B409-1~7] 3.8 Optical measurement, instrumentation, and sensor

[15p-B409-6] Correlation-based Shack-Hartmann wavefront sensing: algorithm and simulation

〇Takao Endo¹, Yoshichika Miwa¹, Toshiyuki Ando¹, Shigetaka Itakura², Yasutaka Fujii² (1.MELCO IT R&D Center, 2.MELCO Kamakura Works)

Keywords:Wavefront Sensing, Shack-Hartmann Sensor, Cross Correlation

A Shack-Hartmann wavefront sensor (SH-WFS) is one of the most common methods used to characterize the wavefront aberrations of an optical system. A conventional SH-WFS generally requires a single point source beacon as the reference wavefront. However, such a reference source is not generally available for remote imaging applications. For this reason, we are developing extended-scene SH-WFS for testing optics.
As a result of the verification test, we confirmed that the RMS error evaluated from the cross-correlation of the sub-image satisfy less than 1/50 pixel on our SH-WFS testbed. It corresponds to measure the fifth-order aberration of testing optics with an accuracy of 5/100λ.
In this paper, we discuss the correlation-based wavefront sensing algorithm and the preliminary results of the prototype SH-WFS.