Spot detection is of great importance for airborne laser communications and airborne laser weapons. However, due to the boundary layer created near the optical turret by aircraft flight, a wavefront distortion is generated, which ultimately affects the imaging quality. In this paper, the flow field near an optical turret with a planar window is simulated at high-speed using a numerical method. The wavefront aberrations are obtained by ray tracing and the spot images are compared for different flight altitudes, flight speeds and planar window orientations. Further, the convergence speed and correction effect of Wavefront Sensorless Adaptive Optics (WFSless AO) with different iterative control algorithms are compared. The simulation results show that the Accelerated Stochastic Parallel Gradient Descent (ASPGD) algorithm is well suited for the correction of wavefront aberrations caused by boundary layer effects.
We proposed a superresolving pupil filter based on deformable mirror (DM) eigenmodes in this paper. A set of superresolving pupil filters containing the first, sixth, fifteenth and 28th order DM eigenmodes are designed by solving a multi-objective optimization problem. Simulations show that the pupil filter can make the transverse spot size be reduced by approximately 30% compared to the diffraction-limited one, and the corresponding Strehl ratio is approximately 0.4. Moreover, pupil filters based on different order eigenmodes are designed and their superresolution performances are discussed respectively, the results show that it is possible to obtain superresolution even if the order of eigenmodes drops to 2. Finally, we analyze the influence of sampling rate of influence functions(IF) and system noise when using DM to fit the designed filters, which is significant for choosing the appropriate filter in practical applications.
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