Université de Neuchâtel

Diffractive beamshaping elements at the fabrication limit

Singer, Wolfgang ; Herzig, Hans-Peter ; Kuittinen, Markku ; Piper, Eckhard ; Wangler, Johannes

In: Optical Engineering, 1996, vol. 35, no. 10, p. 2779-2787

We treat the generation of flat-top intensity distributions, as required for laser applications at short wavelengths. To obtain high fill factors and almost arbitrary shapes, arrays of diffractive Fresnel zone plates at the fabrication limit are investigated. The angular power spectrum noise due to the binarization of the transmission phase function is smoothed using an incoherent source. The...

Université de Neuchâtel

Review of iterative Fourier-transform algorithms for beam shaping applications

Ripoll, Olivier ; Kettunen, Ville ; Herzig, Hans-Peter

In: Optical Engineering, 2004, vol. 43, no. 11, p. 2549

We present a comparison of some of the most used iterative Fourier transform algorithms (IFTA) for the design of continuous and multilevel diffractive optical elements (DOE). Our aim is to provide optical engineers with advice for choosing the most suited algorithm with respect to the task. We tackle mainly the beam-shaping and the beam-splitting problems, where the desired light distributions...