20 March 2003 Comparison between a Shack-Hartmann and a distorted grating wavefront sensor
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Abstract
A comparison of the wavefronts recorded simultaneously by a Shack-Hartmann and a Distorted Grating Wavefront Sensor (DGWFS) has been completed. The DGWFS is a phase diversity/wavefront curvature type of sensor using a grating to generate the multiple image planes. Data were collected under simulated propagation conditions using the Advanced Concept Laboratory at Lincoln Laboratory. The sensors were arranged such that both recorded a time varying sample of the wavefront at exactly the same time. Dynamic and static comparisons of the two sensors under conditions that ranged from a benign path, D/r0 = 2, to a propagation condition with significant scintillation, D/r0 =50, were completed. The data show that the two techniques measure static, low amplitude, on the order of a few waves, aberrations with little difference. Under conditions where there are significant aberrations, the wavefronts measured by the two sensors show notable differences with the DGWFS exhibiting a smoothed, low passed, rendition of the wavefront. As the aberrations increase to produce scintillated condition the differences become more pronounced.
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Leonard John Otten, Leonard John Otten, Joshua Lane, Joshua Lane, Gavin R. G. Erry, Gavin R. G. Erry, Paul Harrison, Paul Harrison, Lawrence D. Weaver, Lawrence D. Weaver, G. Martin, G. Martin, } "Comparison between a Shack-Hartmann and a distorted grating wavefront sensor", Proc. SPIE 4884, Optics in Atmospheric Propagation and Adaptive Systems V, (20 March 2003); doi: 10.1117/12.462437; https://doi.org/10.1117/12.462437
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