刘超, 王熔, 兰斌, 李学莹, 张开河, 代天君, 张优. 锋芒光束抑制大气湍流的研究进展与展望(封面文章·特邀)[J]. 红外与激光工程, 2024, 53(5): 20240098. DOI: 10.3788/IRLA20240098
引用本文: 刘超, 王熔, 兰斌, 李学莹, 张开河, 代天君, 张优. 锋芒光束抑制大气湍流的研究进展与展望(封面文章·特邀)[J]. 红外与激光工程, 2024, 53(5): 20240098. DOI: 10.3788/IRLA20240098
Liu Chao, Wang Rong, Lan Bin, Li Xueying, Zhang Kaihe, Dai Tianjun, Zhang You. Research progress and prospects of suppressing atmospheric turbulence with optical pin beams (cover paper·invited)[J]. Infrared and Laser Engineering, 2024, 53(5): 20240098. DOI: 10.3788/IRLA20240098
Citation: Liu Chao, Wang Rong, Lan Bin, Li Xueying, Zhang Kaihe, Dai Tianjun, Zhang You. Research progress and prospects of suppressing atmospheric turbulence with optical pin beams (cover paper·invited)[J]. Infrared and Laser Engineering, 2024, 53(5): 20240098. DOI: 10.3788/IRLA20240098

锋芒光束抑制大气湍流的研究进展与展望(封面文章·特邀)

Research progress and prospects of suppressing atmospheric turbulence with optical pin beams (cover paper·invited)

  • 摘要: 大气的随机起伏会引起光束的畸变、扩展、漂移和闪烁等湍流效应。常用的抑制方法主要有自适应光学技术、信号处理技术和无衍射光束传输技术等,这些技术存在系统复杂或者效果不理想等问题。近年来,一种名叫锋芒光束的特殊光束被提出并用于抑制大气湍流,受到学术界广泛关注。锋芒光束在传输过程中具有自聚焦的特点,经过焦点后退化为类贝塞尔光束继续向前传输。随着对锋芒光束的深入研究,为了适应多种复杂的应用环境,其衍生的锋芒涡旋光束和稳定光束也被发现具有极高的研究价值。经过同等强度的湍流传输,锋芒涡旋光束比起LG涡旋光束在质心偏移和抖动量改善了50%以上。稳定光束在20 mm的传输距离范围内,其参数积仅为高斯光束参数积的49.40%。锋芒光束被证明可以有效抑制大气湍流,并实现长距离稳定传输。使用锋芒光束进行大气传输,系统结构简单、成本低,抑制湍流实时性高、效果好。文中综述了锋芒光束的产生、传输特性和应用研究,并对其发展趋势和应用前景进行了展望。

     

    Abstract:
      Significance   The random fluctuations of atmosphere cause turbulence effects, such as beam distortion, expansion, drift, and scintillation. Turbulence poses a serious problem for beam propagation in space, limiting the use of optical systems. Atmospheric turbulence suppression has become a problem that must be solved in technical fields such as astronomical imaging, laser atmospheric transmission, and space-atmosphere laser communication. Generally, the main suppression methods mainly include adaptive optics technology, signal processing technology, and non-diffracting beam transmission technology, which have problems such as complex systems or unsatisfactory effects. Finding a simple, effective, stabilizing transmission technique that allows the beam to suppress turbulence is important for scientific research.
      Progress   In recent years, a special beam called optical pin beam has been proposed and used to suppress atmospheric turbulence, which has received widespread attention in the academic community. The optical pin beam, which belongs to a special type of non-diffracting beam, is synthesized from multiple radially symmetric Airy beams. It has the characteristic of self-focusing during transmission. Before reaching the focal point, the transverse wave vectors cancel each other out, and the spot at the focal point is minimized. After passing through the focal point, it degenerates into a Bessel-like beam and continues to propagate forward. Compared to ordinary beams, optical pin beams have more concentrated beam energy and smaller spot energy when transmitted through turbulent environments. With the depth study of the optical pin beam, in order to adapt to various complex application environments, its derived pin-like optical vortex beams and steady optical beams have also been found to have extremely high research value. After turbulence transmission of the same intensity, the pin-like optical vortex beam has improved its center of mass shift and jitter by more than 50% compared to the LG vortex beam. The beam parameter product of the steady optical beam within a transmission distance range of 20 mm is only 49.40% of that of the Gaussian beam. The optical pin beam has been proven to suppress atmospheric turbulence effectively and achieve stable long-distance transmission. The use of optical pin beams for atmospheric transmission has a simple system structure, low cost, and high real-time suppression of turbulence with good results.
      Conclusions and Prospects   The optical pin beam can resist turbulence transmission and exhibits self-focusing transmission properties in turbulent environments, which are more stable than those of Gaussian beams, and the spot energy is more concentrated than that of conventional Gaussian beams. Its excellent properties are expected to play a more important role in turbulence suppression studies. Its derived beams such as pin-like optical vortex beams and steady optical beams also show better performance in anti-turbulence transmission, and are expected to be applied more in fields such as laser communication and imaging. In scenarios where complex adaptive optics systems cannot be applied, the use of optical pin beams for correction of aberrant wavefront is a great turbulence suppression technique. Therefore, it is of great theoretical and practical application value to carry out research on the transmission characteristics of optical pin beams and their derived beams, and their applications in the fields of laser atmospheric transmission and atmospheric laser communication.

     

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