Design of diffractive beam shaper for transforming a Gaussian beam to a squared uniform beam

Ku-Hui Hsu; Hoang Yan Lin

doi:10.1117/12.757562

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4 January 2008 Design of diffractive beam shaper for transforming a Gaussian beam to a squared uniform beam

Ku-Hui Hsu, Hoang Yan Lin

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Proceedings Volume 6832, Holography and Diffractive Optics III; 68320U (2008) https://doi.org/10.1117/12.757562
Event: Photonics Asia 2007, 2007, Beijing, China

Abstract

In this paper, we design phase-only and quantized diffractive optical elements to transfer a field with circular Gaussian intensity distribution to an expanded squared uniform distribution based on the Fresnel diffraction theorem. The simulated annealing algorithm was used to design these elements. Many different cost functions were defined, applied and compared in this algorithm. Besides, we found that dark area expansion in the target patterns can improve the uniformity of designed results. However, there are no improvements when the bright area is smaller than an eight in one dimension of the total diffraction field. In addition, the uniformity can be improved at the expense of decreased diffraction efficiency.

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Ku-Hui Hsu and Hoang Yan Lin "Design of diffractive beam shaper for transforming a Gaussian beam to a squared uniform beam", Proc. SPIE 6832, Holography and Diffractive Optics III, 68320U (4 January 2008); https://doi.org/10.1117/12.757562

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