Author Affiliations
1 Key Laboratory on Adaptive Optics, Chinese Academy of Sciences, Chengdu, Sichuan 610209, China2 Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu, Sichuan 610209, China3 University of Chinese Academy of Sciences, Beijing 100049, Chinashow less
Fig. 1. Compensation system for laser transmission in atmospheric turbulence with active illumination beacon
Fig. 2. Propagation model of illumination beam
Fig. 3. Relationship between actuator of deformable mirror and sub-aperture of wavefront sensor
Fig. 4. Diagram of illuminating beam layout when illuminating beam is flat-topped beam. (a) Four illuminators; (b) nine illuminators
Fig. 5. Influence of laser beam diameter on wavefront sensing performance of active illumination beacon. (a) Four illuminators; (b) nine illuminators
Fig. 6. Height distributions of different roughnesses of target surface. (a) Extreme roughness; (b) strong roughness; (c) medium roughness; (d) weak roughness
Fig. 7. Scattered wave collimated by telescope with nine illuminators. (a) Normalized standard deviation of light intensity; (b) wavefront RMS
Fig. 8. Atmospheric turbulence aberrations detected by active illumination beacon with nine illuminators
Fig. 9. Influence of surface roughness on correction effect of AO system. (a) Four illuminators; (b) nine illuminators
Fig. 10. Difference of Strehl ratios obtained by AO systems with four illuminators and nine illuminators
Statistical parameter | σh>λ, lc<λ | 0.3λ<σh<0.1λ, lc≈λ | 0.1λ<σh<0.3λ, lc≫λ | σh<0.1λ, lc≫λ |
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Roughness | Extreme | Strong | Medium | Weak |
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Table 1. Division of surface roughness
Elevation angle /(°) | RMS /μm |
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Point source | Strong roughness | Medium roughness | Weak roughness |
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5 | 0.0998 | 0.1774 | 0.2285 | 0.3314 | 15 | 0.0572 | 0.0758 | 0.1213 | 0.2022 | 30 | 0.0434 | 0.0598 | 0.0994 | 0.1557 |
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Table 2. RMS of beacon detection error