Three-point collimation technology of COIL resonator
To improve the performance of chemical oxygen-iodine laser(COIL) beam,a three-point dynamic collimation method is proposed,and a resonator auto-alignment system with auto-adjusting function is designed.The system uses position sensitive device(PSD) as the position detecting element,three groups of PZT as the driving element.The coupling model of the system is presented.Multivariable self-adaptation closed-loop decoupling arithmetic is used to design a three-input-three-output decoupling controller,resulting in high precision dynamic alignment and high qualily light beam. Experiments indicate that the collimating range of the system is 4 mrad,the precision is 5 μrad and the frequency response is 20 Hz,which meet the demand of resonator alignment system for COILs.