The inherent feature of the coherent optics is the speckle phenomena. To reduce the spiral speckle in the diffraction image generated by the diffractive optical element, we designed the boundary modulated diffractive optical element. The spiral speckles can be removed by introducing an appropriate smooth initial phase to the image plane and conserving the smoothness of it during the iteration process of the iterative Fourier transform algorithm. To conserve the smoothness of the phase on the image plane, the aperture shape of the diffractive optical element is modified optimally. The diffractive optical element with deformed aperture decreases the transmission efficiency. TO increase the transmission efficiency, the initial phase distribution of the image plane is optimized by use of the genetic algorithm.
Optimal design of boundary-modulated diffractive optical elements for general beam shaping
Practical Holography XVI and Holographic Materials VIII ; 2002 ; San Jose,California,United States
Proc. SPIE ; 4659
2002-06-03
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
DTuD21 Optimization of beam shaping diffractive elements using a bias phase
British Library Conference Proceedings | 2000
|Comparison of Diffractive Optical Element Types for Far-Field Beam Shaping
British Library Conference Proceedings | 2002
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