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半导体激光器发出的光束具有较大的发散角且存在像散,严重影响了其应用。基于对半导体激光器远场分布的准确了解,提出了一种二元光学消像散准直器件的设计方法,并给出了详细的设计原理及过程。依据已知光束等相位面的具体分布(光束的像散因子也包含在其中),可得到二元光学器件的相位分布,使光束经过此二元光学器件后,等相位面成为平面,达到了准直、消像散的目的。此方法简单、直观,具有很高的准确性和可行性。所得二元光学器件表面具有多位相的浮雕结构。
The beam emitted by a semiconductor laser has a large divergence angle and the presence of astigmatism, seriously affecting its application. Based on the accurate understanding of the far-field distribution of semiconductor laser, a design method of binary optical anti-aliasing scattering collimating device is proposed, and a detailed design principle and process are given. According to the specific distribution of the phase plane of the known light beam (the astigmatism factor of the light beam is also included), the phase distribution of the binary optical device can be obtained. After the light beam passes through the binary optical device, the phase plane becomes a plane Alignment, elimination of astigmatism purposes. This method is simple, intuitive, with high accuracy and feasibility. The resulting binary optical device surface has a multi-phase relief structure.