Ascertainment Of A Wavefront Gradient Of A Light On The Basis Of Angle Dependent Transmission

Abstract: The invention relates to a method for ascertaining a wavefront gradient, comprising: (a1) first irradiation of a transmission filter unit (4) with a light (2a, 2b), with a first angle (a) between the light (2a, 2b) and a main transmission direction (4a*, 4b*) of the transmission filter unit (4) for the light (2a, 2b); (a2) first measurement of a first intensity I1 of the light (2a, 2b) transmitted through the transmission filter unit (4); (b1) second irradiation of the transmission filter unit (4) with the light (2a, 2b), with a second angle (-a) between the light (2a, 2b) and the main transmission direction (4a*, 4b*) of the transmission filter unit (1) for the light (2a, 2b); (b2) second measurement of a second intensity I2 of the light (2a, 2b) transmitted through the transmission filter unit (4), wherein the two angles (a, -a) between the light (2a, 2b) and the main transmission direction (4a*, 4b*) are in a common measurement plane and have the same angle, but different signs; (c) calculating a spatial contrast K from a difference of the first intensity I1 and the second intensity I2 from a sum of the first intensity I1 and the second intensity I2; and (d) ascertaining a local wavefront gradient S from the calculated spatial contrast K and a calibration factor c, ascertained in a calibration method, of the transmission filter unit (4) in order to implement improved ascertainment of wavefront gradients.

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