摘要
The optical rotational Doppler effect associated with orbital angular momentum provides a new means for rotational velocity detection.In this paper,we investigate the influence of atmospheric turbulence on the rotational Doppler effect.First,we deduce the generalized formula of the rotational Doppler shift in atmospheric turbulence by mode decomposition.It is found that the rotational Doppler signal frequency spectrum will be broadened,and the bandwidth is related to the turbulence intensity.In addition,as the propagation distance increases,the bandwidth also increases.And when C_(n)^(2)≤5×10^(-15)m^(-2/3)and 2z≤2 km,the rotational Doppler signal frequency spectrum width d and the spiral spectrum width d_(0)satisfy the relationship d=2d_(0-1).Finally,we analyze the influence of mode crosstalk on the rotational Doppler effect,and the results show that it destroys the symmetrical distribution of the rotational Doppler spectrum about 2l·Ω/2π.This theoretical model enables us to better understand the generation of the rotational Doppler frequency and may help us better analyze the influence of the complex atmospheric environment on the rotational Doppler frequency.
作者
马圣杰
徐世龙
董骁
张鑫源
陈友龙
胡以华
Sheng-Jie Ma;Shi-Long Xu;Xiao Dong;Xin-Yuan Zhang;You-Long Chen;Yi-Hua Hu(State Key Laboratory of Pulsed Power Laser Technology,National University of Defense Technology,Hefei 230037,China;Key Laboratory of Electronic Restriction of Anhui Province,National University of Defense Technology,Hefei 230037,China)
基金
Project supported by the Research Plan Project of the National University of Defense Technology(Grant No.ZK18-0102)
the National Natural Science Foundation of China(Grant No.61871389)
the State Key Laboratory of Pulsed Power Laser Technology(Grant No.KY21C604)
the Postgraduate Scientific Research Innovation Project of Hunan Province(Grant Nos.CX20220007 and CX20230024)。
