Scaling law for incoherently combined laser array propagating in the atmosphere

Wei Yan; Song Zhang; Wenjie Luo; Min Li; Junhao Gu; Yong Li; Hu Ye

doi:10.1117/12.3014665

30 April 2024 Scaling law for incoherently combined laser array propagating in the atmosphere

Wei Yan, Song Zhang, Wenjie Luo, Min Li, Junhao Gu, Yong Li, Hu Ye

Proceedings Volume 13153, Sixth Conference on Frontiers in Optical Imaging and Technology: Novel Technologies in Optical Systems; 131530G (2024) https://doi.org/10.1117/12.3014665
Event: Sixth Conference on Frontiers in Optical Imaging Technology and Applications (FOI2023), 2023, Nanjing, JS, China

Abstract

High power fiber lasers can be incoherently combined to form the basis for high energy laser applications. Incoherent combining of fiber lasers has a number of advantages over other laser beam combining methods. However, the far-field beam quality of the incoherently combined laser array can still be significantly degraded by atmospheric optical turbulence. In this article, a general scaling law for propagation of incoherently combined laser array through atmosphere is developed by employing theoretical analysis and the common stochastic wave optics technique, and mainly focus on the effects of diffraction and atmospheric optical turbulence. The scaling law developed in the present work differs from standard scaling laws in its definition of irradiance. We show that the far-field irradiance and beam dispersion of any incoherently combined laser array, regardless of near-field beamlets geometry, can be obtained in terms of four basic parameters: laser power, field effective area, pupil field factor, and the Fried parameter.The results show that the formula is simple but predicts peak irradiance and beam dispersion accurately in the far field with varying levels of atmospheric turbulence, regardless of the near-field beamlets geometry.

Citation Download Citation

Wei Yan, Song Zhang, Wenjie Luo, Min Li, Junhao Gu, Yong Li, and Hu Ye "Scaling law for incoherently combined laser array propagating in the atmosphere", Proc. SPIE 13153, Sixth Conference on Frontiers in Optical Imaging and Technology: Novel Technologies in Optical Systems, 131530G (30 April 2024); https://doi.org/10.1117/12.3014665

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KEYWORDS

Atmospheric propagation

Atmospheric optics

Optical turbulence

Fiber lasers

Optical simulations

Wave propagation

Beam diameter

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