用于激光合束系统的光束位置监测装置设计

为了实现近场可见光波段、多路不同波长激光合束中位置误差监测,设计了一种光斑位置监测装置,该装置以缩束系统为基础对同指向激光束位置进行自动监测,在激光合束系统中与快速反射镜相配合,能有效提高合束系统的精度和合束效率。首先对监测装置光学系统进行了设计和仿真分析,使其实现缩束功能的同时减小色差对监测精度的影响。接着,根据设计要求选择了合适的光电探测器。然后,设计了镜筒并对装置的箱体进行有限元优化设计以减轻质量并防止产生共振,使其可以在复杂的环境中工作。最后,根据光斑的特性选择了合适的光斑中心定位算法。实验检测结果表明:缩束倍数达到了15.6倍,监测精度达到了0.1 mm。系统基本上可以使所有激光束成像在CCD上,且光斑能在CCD上成完全像,稳定性较好,精度高,满足使用要求。

Design of beam position monitoring device for laser beam combining system

In order to realize the position monitoring of the laser beam in the near-field visible light band and multiple different wavelengths of laser combining,a spot position monitoring device is designed.The device monitors the position of the same pointing laser beam based on the shrink-beam system.In the beam combining system,it cooperates with the FMS to effectively increase the accuracy and beam combining efficiency of the beam combining system.Firstly,the optical system of the device was designed,simulated and analyzed to shrink beam and reduce the influence of chromatic aberration on accuracy.Then,according to the design requirements,the appropriate photodetector was selected.Then,the drawtube is designed and the device′s cabinet is finite element optimized to prevent resonance,making it work in complex environments.Finally,a suitable calculation method of spot centering is selected according to the characteristic of the spot.The experimental results show that the multiplier of shrink-beam system reaches 15.6 times and the monitoring accuracy reaches 0.1 mm.The system can basically image all the laser beams on the CCD,and the spot can be completely imaged on the CCD,and its stability is good,the precision is high,and the design requirements are met.