Patent ID: 9411140
Filing Date: 2016-08-09
CPC Classification: G02B

Claim Text:
1. A method for the calibration of an optical device having a spatial optical modulator ( 6 ), said optical device comprising a light source point ( 1 ), an optical objective ( 8 ) of numerical aperture adapted to receive an optical beam incident on a sample and/or to collect an optical beam reflected by a sample, a camera ( 14 ) placed in a plane that is optically conjugate to a focal plane of the objective ( 8 ), and a spatial optical modulator placed on the optical beam upstream of the camera ( 14 ), said method comprising the steps of: a) placement of a reflective planar sample ( b) application of a command of amplitude R c) acquisition of an image of an intensity point spread function (PSF) in a plane conjugate to the focal plane of the objective ( d) modification of an axial distance between the objective ( e) iteration of the steps c) and d) for a plurality of axial distances between the sample ( f) reconstruction of an amplitude and/or phase profile of the optical beam in a plane conjugate to the focal plane of the objective by a phase diversity algorithm for a value R g) iteration of the steps b) to f) for a plurality of amplitude values R h) determination of an influence function E i) iteration of the steps b) to h) for each element P j) determination of the influence functions (E wherein PSF measurements are performed for three axial distances between the objective ( wherein the step f) of reconstruction of the amplitude and/or phase profile of the beam comprises the following steps: