Abstract
This study proposes a newly developed optimization method for an aspherical lens system employed in a refractive laser beam shaping system, which performs transformations on laser spots such that they are transformed into flat-tops of any size. In this paper, a genetic algorithm (GA) with multipoint search is proposed as the optimization method, together with macro language in optical simulation software, in order to search for ideal and optimized parameters. In comparison to a traditional two-dimensional (2D) computational method, using the one-dimensional (1D) computation for laser beam shaping can search for the optimal solution approximately twice as fast (after experiments). The optimal results show that when the laser spot shrinks from 3 mm to 1.07 mm, 88% uniformity is achieved, and when the laser spot increases from 3 mm to 5.273 mm, 90% uniformity is achieved. The distances between the lenses for both systems described above are even smaller than the thickness for the first lens, enabling us to conclude that our design objectives of extra light and slimness in the system are achieved.
Highlights
A laser beam has the following properties: it is high powered, directional, coherent, and monochromatic
A genetic algorithm (GA) is used for optimization, and our laser beam shaping design is based on a refractive system
Our study is divided into five sections: an introductory section, the GA optimization for a laser shaping system, different calculation methods for optimization, simulation results for the laser beam shaping system, and a conclusion
Summary
A laser beam has the following properties: it is high powered, directional, coherent, and monochromatic. Through optical design [1,2,3], the Gaussian distribution [4] of the laser beam energy is converted to uniform distribution. Laser shaping designs are often based on derived methods [5]. Most laser shaping systems assume that the incident beam is collimated [7,8] for ease of derivation. Not all systems are designed to use laser beams with a collimated light source [12]. The laser beam shaping often concerns about the spot size and collimation simultaneously. A GA is used for optimization, and our laser beam shaping design is based on a refractive system. Our study is divided into five sections: an introductory section, the GA optimization for a laser shaping system, different calculation methods for optimization, simulation results for the laser beam shaping system, and a conclusion
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