title: Extended hartmann test based on the pseudoguiding property of a hartmann mask completed by a phase chessboard.
abstract: We propose to add a specific phase chessboard to the classical Hartmann mask used for wave-front sensing. By doing this we obtain a pseudoguiding of the energy issuing from this mask, allowing for an increase in the sensitivity of the Hartmann test. This property is illustrated by experiment, and a comparison between classical and new Hartmanngrams is presented.
authors: J
authors: J
authors: Primot
authors: N
authors: N
authors: Guérineau