Optical design of laser diode beam-homogenizing system

In order to improve the uniformity of the laser diode beam, a homogenization system combined aspheric and microlens lens array was designed. The aspheric homogenization lens was designed by using ray tracing in the direction of the fast axis, and the microlens array was used to segment and overlay the beam in the slow axis direction. Laser diode output beam passed through the honogenizing system, the energy homogenization of the square spot can be obtained on the target surface. By using Zemax optical software to simulate the single tube and array, the feasibility of the optical system was verified. The influence of target dynamic range change on uniformity was obtained, and the influence of the change of the distance between micro-cylindrical lens arrays and the rotation of fast-axis homogenizing lens on the uniformity was studied. The homogeneity of single tube and laser array on the output surface was over 90%, and the energy efficiency was 95.4% and 96.2%, respectively. The design results have certain reference value for the beam homogenization of laser diode.