Design Of The Phase Precise Adjustment Mechanism Of The CCR Array And Its Phase-locked Control

The corner cube reflector(CCR)is a kind of beam reflector element,which can return the incident light through three mutually perpendicular reflecting surfaces.This feature makes it important in target tracking,optical distance measurement and other fields.Limited by the structure and machining accuracy of CCR,the common CCR is small in diameter,large aperture retroreflectors are usually composed of arrays.Due to the installation error and other reasons,there will be spatial position difference between CCRs in the array,which will affect the piston phase between the reflected beams.At present,the research of CCR mainly focuses on the machining error,and there is no effective solution to the reduction of reflection efficiency caused by the spatial position error between CCRs in the array.Therefore,this paper designs the phase precision adjustment mechanism of retroreflectors,and studies its phase-locked control method,so as to improve its performance and expand the application scenarios.Firstly,the basic principle of CCR reflection is clarified by the method of beam kinematics,and the far-field simulation model of the reflected beam is established by the method of Fourier optics.Secondly,the basic design and processing of the mechanism are carried out,through experiments,the correctness of the simulation model,the effectiveness of the detection method and the reliability of the mechanical principle are confirmed.Third,without directly measuring the spatial error of CCR,this paper uses the phase-locked control method in the field of coherent synthesis.By controlling the phase of the reflected beam,the spatial position error between the sub apertures of CCRs can be corrected.The phase-locked control methods are compared and studied by means of simulation.Finally,based on the verification of the previous mechanism,the structure is optimized and improved;based on the method of phase-locked control,the convergence of closed-loop control is realized.The experimental results show that the CCRs phase precision mechanism and phase-locked control algorithm can effectively improve the efficiency of CCRs,and has a certain stability.In addition,this paper extends the use of CCRs,which is no longer limited to the optical reflector,but also can be used as a phase modulator to realize the piston phase control in the optical system.It plays an important role in the field of phase modulation because of its unity,purity,stability and scalability.And the phase modulation ability of the piston is proved by vortex light experiment.