1. bookVolume 10 (2010): Issue 3 (June 2010)
Journal Details
License
Format
Journal
eISSN
1335-8871
First Published
07 Mar 2008
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6 times per year
Languages
English
access type Open Access

Wavefront sensors for adaptive optical systems

Published Online: 16 Jun 2010
Volume & Issue: Volume 10 (2010) - Issue 3 (June 2010)
Page range: 102 - 107
Journal Details
License
Format
Journal
eISSN
1335-8871
First Published
07 Mar 2008
Publication timeframe
6 times per year
Languages
English
Wavefront sensors for adaptive optical systems

A high precision Shack-Hartmann wavefront (WF) sensor has been developed on the basis of a low-aperture off-axis diffraction lens array. The device is capable of measuring WF slopes at array sub-apertures of 640x640 μm in size with an error not exceeding 4.80 arcsec (0.15 pixel), which corresponds to the standard deviation equal to 0.017 λ at the reconstructed WF with wavelength λ. Also the modification of this sensor for adaptive system of solar telescope using extended scenes as tracking objects, such as sunspot, pores, solar granulation and limb, is presented.

The software package developed for the proposed WF sensors includes three algorithms of local WF slope estimation (modified centroids, normalized cross-correlation and fast Fourier-demodulation), as well as three methods of WF reconstruction (modal Zernike polynomial expansion, deformable mirror response function expansion and phase unwrapping), that can be selected during operation with accordance to the application.

Keywords

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