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《Acta Optica Sinica》 2012-02
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Simulation on Mean Flow-Field Aero-Optic Effect of Airborne Optical Platform

Dong Hang Zhang Jianzhu Xu Ming(Institute of Applied Physics and Computational Mathematics,Beijing 100094,China)  
The simulation of the mean flow over airborne laser fairing as well as its aeroptic analysis with selected area electron diffraction software is presented.The simulation reveals that the aero-optic effect with respect to the mean flow field strongly depends on the beam direction: along different beam propagation directions,the root mean square of optical path difference varies between 0.13-1.20 μm,and tilt angle of beam axis varies between 1-12 μrad.Furthermore,the wave-front distortion caused by mean flow-field aeroptic effect is mainly low-order effect: the ratio of tilt to the aberration is about 92%,and the ratio of tilt,defocussing and astigmatism is about 99%.The average of beam quality factor β over all directions caused by no-tilt wave-front aberration is 1.8;when defocussing and astigmatism is corrected,the average of beam quality factor β is 1.16.The beam quality factor β caused by no-tilt aberration increases with the increment of beam radius as a nearly linear manner.
【CateGory Index】: O439
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