Educational content :

• Fraunhofer diffraction (slit, hole, square, rectangle, ...)
  
• Fourier transform and its optical properties
  
• High pass filter and low pass frequency space: Abbe Experiment (filtering a grid) - Descreen photography - Schlieren photography - Edge Detection
• 4f Arrangement - Impulse Response Filters
  
• Optical Correlator - Pattern Recognition (letter "R" and "O" in the word "Fourier")
  
• Study of the correlation function of the translation, rotation or scale change in the object plane.