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反射式激光聚焦系统使激光推力器具备了推力矢量控制能力,并且聚焦系统不存在球差,具有广阔的应用前景。针对三种二次反射聚焦方式,抛物面-双曲面、平面-抛物面、抛物面-平面,在建立的聚焦系统坐标系下,通过几何光学方法分析了两个反射面母线参数之间的数学关系,以及聚焦特征参数与两个反射面母线参数的关系,并建立了程序设计流程。针对特定的聚焦特征参数设计要求,在光学软件ZEMAX中进行了反射面的建模和聚焦效果的验证,为下一步开展聚焦性能的研究打下了基础。
The reflective laser focusing system makes the laser thruster have thrust vector control ability, and there is no spherical aberration in the focusing system, which has a broad application prospect. For the three kinds of second-order refocusing methods, paraboloid-hyperboloid, plane-paraboloid, paraboloid-plane, the mathematical relationship between the parameters of the two reflecting surfaces is analyzed by geometrical optics under the established focal system coordinate system. Focusing on the relationship between the characteristic parameters and the bus parameters of the two reflecting surfaces, a programming procedure was established. According to the design requirements of the specific focusing parameters, the modeling of the reflecting surface and the verification of the focusing effect are carried out in the optical software ZEMAX, which lays the foundation for the research on the focusing performance in the next step.