Diffractive optical element array to realize uniform focal spot with any geometrical shape transform

Qiaofeng Tan; Yingbai Yan; Guofan Jin; Minxian Wu

doi:10.1117/12.347807

7 May 1999 Diffractive optical element array to realize uniform focal spot with any geometrical shape transform

Qiaofeng Tan, Yingbai Yan, Guofan Jin, Minxian Wu

Proceedings Volume 3740, Optical Engineering for Sensing and Nanotechnology (ICOSN '99); (1999) https://doi.org/10.1117/12.347807
Event: Optical Engineering for Sensing and Nanotechnology (ICOSN '99), 1999, Yokohama, Japan

Abstract

Uniform focal spot which has top flat, steep edge, low sidelobes and other features is needed in many fields, such as Inertial Confinement Fusion and laser manufacturing. For different application, different input conditions and output demands are requested, for example, the laser put in or/and uniform focal spot put out has any kinds of geometrical shape, including circular, square, elliptical and so on. Such uniform focal spots with a certain geometrical shape transform can be realized by using Diffractive Optical Elements (DOEs) array, which has many advantages, such as high light efficiency of the pure phase modulation, strong flexibility of the phase design and geometrical shape transform and so forth. Hybrid algorithm based on hill-climbing and simulated annealing is utilized for phase design because of the ability of strong convergence of the hill-climbing and the global optimization potential of the simulated annealing. Geometrical shape transform is based on the principle of any geometrical shape can be approximated to by some series of square cells with different positions, different or same sizes. The phase design is simplified by adopting square cells, because two- dimensional problem is converted to one-dimensional problem. Two typical cases are concerned, i.e. circular laser put in with square uniform focal spot put out and square laser put in with circular uniform focal spot put out. Simulated results show this method and the hybrid algorithm are very valid. 6

Citation Download Citation

Qiaofeng Tan, Yingbai Yan, Guofan Jin, and Minxian Wu "Diffractive optical element array to realize uniform focal spot with any geometrical shape transform", Proc. SPIE 3740, Optical Engineering for Sensing and Nanotechnology (ICOSN '99), (7 May 1999); https://doi.org/10.1117/12.347807

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