The character of branch points' variation in laser propagation through atmosphere

Xiao-lu Ge; Cheng-yu Fan; Xiao-xing Feng; Cheng-feng Li; Xiao-juan Liu; Sheng-gui Fu

doi:10.1117/12.906944

5 December 2011 The character of branch points' variation in laser propagation through atmosphere

Xiao-lu Ge, Cheng-yu Fan, Xiao-xing Feng, Cheng-feng Li, Xiao-juan Liu, Sheng-gui Fu

Proceedings Volume 8197, 2011 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments; 81970N (2011) https://doi.org/10.1117/12.906944
Event: International Conference on Optical Instruments and Technology (OIT2011), 2011, Beijing, Beijing, China

Abstract

When branch points are present in laser beam wave-front during the propagation in turbulence, the adaptive optics system for atmosphere turbulence compensation will be degraded greatly. Numerical experiments are carried out about branch-point number for the straight flat beam and the focused Gaussian beam propagating in the atmospheric turbulence by four-dimensional code. Mainly two categories of propagation events are explored. In one category the laser beam propagates in weak atmospheric turbulence but long propagating length. In the other the turbulence is stronger but propagating length is shorter. With different calculation parameters and transmitted conditions, the branch point number and its evolvement are different. The relationship between branch-point number and propagation conditions is also studied, and a statistical model about branch point number is built. The work could provide a reference for further study of laser propagation through atmosphere and adaptive optics system.

Citation Download Citation

Xiao-lu Ge, Cheng-yu Fan, Xiao-xing Feng, Cheng-feng Li, Xiao-juan Liu, and Sheng-gui Fu "The character of branch points' variation in laser propagation through atmosphere", Proc. SPIE 8197, 2011 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments, 81970N (5 December 2011); https://doi.org/10.1117/12.906944

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