Propagation of rotational Risley-prism-array-based Gaussian beams in turbulent atmosphere

Feng Chen; Haotong Ma; Li Dong; Ge Ren; Bo Qi; Yufeng Tan

doi:10.1117/12.2316777

5 March 2018 Propagation of rotational Risley-prism-array-based Gaussian beams in turbulent atmosphere

Feng Chen, Haotong Ma, Li Dong, Ge Ren, Bo Qi, Yufeng Tan

Proceedings Volume 10710, Young Scientists Forum 2017; 1071037 (2018) https://doi.org/10.1117/12.2316777
Event: Young Scientists Forum 2017, 2017, Shanghai, China

Abstract

Limited by the size and weight of prism and optical assembling, Rotational Risley-prism-array system is a simple but effective way to realize high power and superior beam quality of deflecting laser output. In this paper, the propagation of the rotational Risley-prism-array-based Gaussian beam array in atmospheric turbulence is studied in detail. An analytical expression for the average intensity distribution at the receiving plane is derived based on nonparaxial ray tracing method and extended Huygens-Fresnel principle. Power in the diffraction-limited bucket is chosen to evaluate beam quality. The effect of deviation angle, propagation distance and intensity of turbulence on beam quality is studied in detail by quantitative simulation. It reveals that with the propagation distance increasing, the intensity distribution gradually evolves from multiple-petal-like shape into the pattern that contains one main-lobe in the center with multiple side-lobes in weak turbulence. The beam quality of rotational Risley-prism-array-based Gaussian beam array with lower deviation angle is better than its counterpart with higher deviation angle when propagating in weak and medium turbulent (i.e. C_n² < 10^-13m^-2/3), the beam quality of higher deviation angle arrays degrades faster as the intensity of turbulence gets stronger. In the case of propagating in strong turbulence, the long propagation distance (i.e. z > 10km ) and deviation angle have no influence on beam quality.

Citation Download Citation

Feng Chen, Haotong Ma, Li Dong, Ge Ren, Bo Qi, and Yufeng Tan " Propagation of rotational Risley-prism-array-based Gaussian beams in turbulent atmosphere ", Proc. SPIE 10710, Young Scientists Forum 2017, 1071037 (5 March 2018); https://doi.org/10.1117/12.2316777

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KEYWORDS

Atmospheric propagation

Prisms

Turbulence

Beam propagation method

Gaussian beams

Laser beam propagation

Atmospheric optics

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