自适应光学系统在天文望远镜观测和激光传输过程中常用来补偿大气湍流引起的波前畸变,压电陶瓷变形镜(PDM)是该系统常用的波前校正元件。在分析了PDM的性能参数,包括:适配误差、致动器的数目与空间布局、动态范围等基础上建立了基于19单元PDM的自适应光学实验系统。该系统采用Zernike模式法重构波前,闭环负反馈实时控制PDM补偿由Matlab模拟的3种波前像差:离焦、像散、彗差形成的波前畸变。实验结果表明,压电陶瓷变形镜在负反馈闭环自适应光学系统中对波前畸变有较好的校正能力。

Piezoelectric deformable mirrors(PDM) is a widely-used wavefront corrector in the adaptive optics which is to compensate for the wavefront aberration generated by the atmosphere turbulence in astronomical telescopes and laser communication systems. Analyzing the performance parameters of PDM,like fitting error,actuators′ number and spatial arrangement,dynamic range,we designed an experimental adaptive optic system based on 19-channel PDM. This system uses Zernike modal approach to reconstruct the wavefront and real-time control PDM to compensate three wavefront aberrations:defocus,astigmatism and coma simulated in Matlab in a negative feedback closed loop. The experimental results show that the piezoelectric deformable mirrors have good correction capability for wavefront aberration in negative feedback closed-loop adaptive optic system.