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29 November 2012 Adaptive optics technology for Fourier telescopy
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Abstract
Previous experiments in both the lab and field have verified that the Fourier Telescopy (FT) technique to imaging geostationary targets is both viable and robust. By theory analysis and numerical calculation of power dispersal and atmosphere’s affection, it is proved that the Adaptive Optical(AO) System for the transmitter subsystem of FT is necessary. A special AO system is designed for FT. The AO systemp includes two wavefront sensors (WFS), a deformable mirror(DM) and an actuator command computer. The AO system can use laser guide stars , GEO itself or star as reference star. Two wavefront sensors have different functions. One WFS is used to measure the wavefront of the reference star’s wavefront after it’s broadcast through the atmosphere, the other WFS is used to measure the transmitted laser’s wavefront before it leave the telescope. The actuator command computer syn-calculate the DM’s distortion value according to two waveront sensors’ measure results and figure out the drive voltage of every actuator. The AO system of Fourier Telescopy will realize two functions. On the one hand,it will improve the transmitted beam’s quality,decrease the laser ‘s size formed at the side of the GEO object and increase the centralization of the transmitted beam. On the other hand, the AO system will decrease effect of atmospheric scintillation and beam-wander on the uplink beams and increase the possibility of the interferometry on GEO targets, so the AO system will decrease the infection to the uplink beam caused by atmosphere turbulence.
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Changming Lu, Xin Gao, Jia Tang, and Jianjun Wang "Adaptive optics technology for Fourier telescopy", Proc. SPIE 8551, High-Power Lasers and Applications VI, 855110 (29 November 2012); https://doi.org/10.1117/12.999256
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