AImpact of multi-beam launch on laser atmospheric transmission under turbulence effect
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摘要: 大气湍流引起的光强起伏会导致大气闪烁、光束漂移、到达角起伏和波前畸变等效应。多光束发射技术是克服激光大气传输中光强起伏的有效途径之一。以单光束、双光束、四光束以及八光束发射为例，通过计算峰值光强、环围功率半径以及像散参数等光束质量参数，得到单光束和多光束大气传输的光强起伏特性。结果表明：随着光束数目的增加，峰值光强显著增大，环围功率半径逐渐缩小，像散参数也随之减小。说明多光束发射方法能有效地减弱湍流效应对大气激光传输的影响。Abstract: Atmospheric turbulence induced intensity fluctuations lead to scintillation, beam drift, angle of arrival fluctuation and wavefront aberration. The multi-beam launch technique is one of the effective ways to mitigate the effect of atmospheric turbulence. Calculation of the beam quality parameters through peak intensity, encircled power radius and bulk parameters based on single beam, double beam, four beam and eight beams of light emission was made. Single-beam and multi-beam intensity fluctuation characteristics of atmospheric transmission were summarized. The results show that, with the increase of beam number, the peak intensity increases significantly, the encircled power radius decreases gradually, and the bulk parameters decreases as well. It is concluded that multi-beam emission method can effectively reduce the atmospheric turbulence effects of laser transmission.
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