Advanced Adaptive Optics Control Techniques.

摘要

Optimal estimation and control methods for high energy laser adaptive optics systems are described. Three system types are examined: Active Multidither (AMD), Phase Conjugate (PC), and Beam Cleanup (BC). Sources of phasefront distortion considered include: atmospheric turbulence, backscatter speckle, base vibration, and mirror thermal distortion. Kalman-type digital algorithms for phasefront aberration estimation are developed and evaluated through computer simulation; performance comparisons with classical estimation approaches are provided. Optimal feedback-feedforward controllers are designed for the active system components; performance comparisons with classical designs and sensivitiy studies related to disturbance model mismatches and active component bandwidth are presented. Results of integrated estimation and control simulations are evaluated. Areas for further refinement of the adaptive optics approaches and potential system implementations are recommended. (Author)