自适应光纤光源准直器的结构设计

Structural design of adaptive fiber optics collimators

设计了一种可以快速高精度调节光纤准直激光束发射角度的自适应光纤光源准直器。该器件利用双压电驱动器控制光纤端面的位置,通过准直透镜实现出射激光束的准直。建立了自适应光纤光源准直器的物理模型,通过理论分析得出了光纤端面的偏移与器件结构参数的关系。研制了一个器件,并对其光纤端面偏移量、谐振频率等进行了测试。实验结果表明,理论分析与研制的自适应光纤光源准直器具有较好的一致性。该工作对自适应光纤光源准直器的结构设计具有指导意义。

Coherent beam combination （CBC） is an effective way to generate high-power and high- radiance laser beams. A kind of adaptive fiber optics collimator（AFOC） was designed which could realize fast and precise corrections of wavefront tip/tilt phase errors in CBC. Compared with the traditional fast steering mirror, this AFOC promises larger beam-tip/tilt range and higher resonance frequency. In the AFOC, four bimorph actuators were employed to control the deviation of the fiber tip and the output beam was collimated by a collimating lens. In this paper, the theoretical model of the AFOC was established, and the relationships between AFOC＇s structural parameters and fiber tip＇s deviations were studied. A real AFOC was developed, and the fiber tip＇s deviation and resonance frequency of this device were measured. Experimental results indicate that the theoretical model of the AFOC is well certified. This work provides a reference for the structural design of AFOC.