Abstract

In the optical quality measuring process of an optical system, including diamond-turning components, the use of a laser light source can produce an undesirable speckle effect in a Shack–Hartmann (SH) CCD sensor. This speckle noise can deteriorate the precision and accuracy of the wavefront sensor measurement. Here we present a SH centroid detection method founded on computer-based techniques and capable of measurement in the presence of strong speckle noise. The method extends the dynamic range imaging capabilities of the SH sensor through the use of a set of different CCD integration times. The resultant extended range spot map is normalized to accurately obtain the spot centroids. The proposed method has been applied to measure the optical quality of the main optical system (MOS) of the mid-infrared instrument telescope smulator. The wavefront at the exit of this optical system is affected by speckle noise when it is illuminated by a laser source and by air turbulence because it has a long back focal length ($3017\mathrm{mm}$). Using the proposed technique, the MOS wavefront error was measured and satisfactory results were obtained.

© 2010 Optical Society of America

Shack–Hartmann centroid detection using the spiral phase transform

J. Vargas, R. Restrepo, J. C. Estrada, C. O. S. Sorzano, Yong-Zhao Du, and J. M. Carazo
Appl. Opt. 51(30) 7362-7367 (2012)

Adaptive thresholding and dynamic windowing method for automatic centroid detection of digital Shack-Hartmann wavefront sensor

Xiaoming Yin, Xiang Li, Liping Zhao, and Zhongping Fang
Appl. Opt. 48(32) 6088-6098 (2009)

Shack-Hartmann spot dislocation map determination using an optical flow method

J. Vargas, R. Restrepo, and T. Belenguer
Opt. Express 22(2) 1319-1329 (2014)

Centroid estimation for a Shack–Hartmann wavefront sensor based on stream processing

Fanpeng Kong, Manuel Cegarra Polo, and Andrew Lambert
Appl. Opt. 56(23) 6466-6475 (2017)

Holographic Shack–Hartmann wavefront sensor based on the correlation peak displacement detection method for wavefront sensing with large dynamic range

Yusuke Saita, Hironobu Shinto, and Takanori Nomura
Optica 2(5) 411-415 (2015)