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Measurement and correction of aberrations in light and electron microscopy

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Academic year: 2021

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Figure 1-1. a) perfect imaging system, b) misaligned system, c) system with sample-induced  aberrations, d) system with aberration correction
Figure  1-2.  The  wavefront  of  a  laser  beam  (far  left)  is  aberrated  by  a  low-quality  optical  component  (center  left),  which  is  analyzed  using  a  Shack-Hartmann  Sensor  (right)  consisting of a lenslet array and a CCD
Figure 1-3. General procedure of modal wavefront sensing for one mode. Three test images  of  the  speckle  pattern  (a1,  b1,  c1)  taken  while  modifying  one  specific  aberration  mode  are  the Fourier transformed (a2, b2, c2) to c alculate their res
Figure 1-4. Sketches illustrating pupil segmentation adaptive optics  using three independent  subregions,  creating  three  beamlets  (blue  rays)
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