Shack–Hartmann wavefront sensor: Difference between revisions
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== Industry == |
== Industry == |
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Different companies that sell Shack-Hartmann sensors : |
Different companies that sell Shack-Hartmann sensors :. |
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* [http://www.optikos.com Optikos Corporation] |
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* [http://www.thorlabs.com/newGroupPage9.cfm?objectGroup_id=2946 Thorlabs GmbH] |
* [http://www.thorlabs.com/newGroupPage9.cfm?objectGroup_id=2946 Thorlabs GmbH] |
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* [http://www.metrolux.de/contenido/cms/wavefront-sensor/ Metrolux GmbH] |
* [http://www.metrolux.de/contenido/cms/wavefront-sensor/ Metrolux GmbH] |
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Revision as of 20:07, 1 November 2010
A Hartmann-Shack or Shack-Hartmann is a type of wavefront sensor. It is commonly used in adaptive optics systems. It consists of an array of lenses (called lenslets) of the same focal length. Each is focused onto a photon sensor (typically a CCD array or quad-cell). The local tilt of the wavefront across each lens can then be calculated from the position of the focal spot on the sensor. Any phase aberration can be approximated to a set of discrete tilts. By sampling an array of lenslets all of these tilts can be measured and the whole wavefront approximated.
Since only tilts are measured the Shack-Hartmann can not detect discontinuous steps in the wavefront.
The design of this sensor was based on an aperture array that had been developed in 1900 by Johannes Franz Hartmann as a means to trace individual rays of light through the optical system of a large telescope, thereby testing the quality of the image.[1] In the late 1960s Roland Shack and Platt modified the Hartmann screen by replacing the apertures in an opaque screen by an array of lenslets.[2][3] The terminology as proposed by Shack and Platt was 'Hartmann-screen'. The fundamental principle seems to be documented even before Huygens by the Jesuit philosopher, Christopher Scheiner,[4] in Austria.
Recently, Pamplona et al.[5] developed the exact inverse of the Shack-Hartmann System to measure one's eye lens aberrations. While Shack-Hartmann sensors measure localized slope of the wavefront error using spot displacement in sensor plane, Pamplona et al. make the user shift the spots till they are aligned. The knowledge of this shift provides data to estimate the first order parameters like radius of curvature and hence error due to defocus and spherical aberration.
References
- ^ Hartmann "Bemerkungen über den Bau und die Justirung von Spektrographen." Z. Instrumentenkd 20:47, 1900
- ^ Platt, Ben C. (2001). "History and Principles of Shack-Hartmann Wavefront Sensing". Journal of Refractive Surgery. 17.
{{cite journal}}: Unknown parameter|coauthors=ignored (|author=suggested) (help) - ^ Shack and Platt "Production and use of a lenticular Hartmann screen," JOSA 61:656, 1971
- ^ Scheiner, "Oculus, sive fundamentum opticum," Innspruk 1619
- ^ Pamplona, Vitor F. (2010). "NETRA: Interactive Display for Estimating Refractive Errors and Focal Range". ACM Transactions on Graphics. 29 (4).
{{cite journal}}: Unknown parameter|coauthors=ignored (|author=suggested) (help)
Industry
Different companies that sell Shack-Hartmann sensors :.