Gradient wavefront sensors with holographic optical elements
We use holographic optical elements for tailoring wavefront sensing technique to specific needs. We have developed a method of holographic correction of aberrations to expand the range of measurements of the Shack-Hartmann wavefront sensor and the Talbot effect sensor by using holographic microlens arrays and two-dimensional diffraction structures with preliminary compensation of aberrations, including those specified by synthesized holographic optical elements. To expand the angular dynamic range of the Shack-Hartmann sensor, we use a matrix of bifocal holographic lenslets and a joint processing of measurement results in the short- and long-focus channels. We have developed and experimentally implemented a method for producing such matrices and a corresponding algorithm for processing measurement data. To manufacture matrices of bifocal holographic lenslets, we use the nonlinear properties of the recording medium.
Installation for studying the shape of the wavefront by gradient methods.
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