激光海洋湍流传输的光束扩展定标规律  

Scaling Laws of Beam Spreading in Laser Ocean Turbulence

作　　者：张庆 孙兴旺 钟哲强[1] 张彬[1] Zhang Qing;Sun Xingwang;Zhong Zheqiang;Zhang Bin(College of Electronics and Information Engineering,Sichuan University,Chengdu 610065,Sichuan,China)

机构地区：[1]四川大学电子信息学院,四川成都610065

出　　处：《光学学报》2024年第12期84-91,共8页Acta Optica Sinica

基　　金：国家重大专项应用基础项目(JG2020376);国家重点研发计划(2021YFC2202203);中国科学院自适应光学重点实验室基金(LAOF1801)。

摘　　要：为快速预测和评估海洋湍流对光束扩展的影响及规律,开展了激光海洋湍流传输的光束扩展定标规律研究。利用功率谱反演法生成海洋湍流相位屏,计算模拟了光束扩展随海水参量和激光参数的变化及规律,进而建立了蓝绿波段激光海洋湍流传输的光束扩展定标关系式。结果表明,在海洋湍流传输距离100 m以内、激光波长范围为470~550 nm、高斯光束束腰半径范围为0.001~0.100 m、温度导致海洋湍流与盐度导致海洋湍流的比值范围为-5.0~-0.5等条件下,所建立定标关系式预估的光束扩展规律与数值计算结果的平均误差在5%以内,可为海洋水下激光通信和激光海洋传输等应用提供有效参考。Objective As underwater military activities and scientific research are increasingly frequent,the demand for high-speed,high-quality,and high-bandwidth underwater communication has become urgent.However,laser communication effectiveness in seawater is hampered by the scattering,absorption,and turbulence effects,which causes degraded beam quality and increased communication error rates.Consequently,it is of application significance to study the beam quality degradation characteristics of blue-green lasers in seawater.However,laser propagation calculation in seawater turbulence is quite complex and time-consuming.Therefore,it is of significance to establish a beam expansion calibration formula,especially for blue-green laser propagation in seawater turbulence.This scaling law will enable the rapid prediction and evaluation of beam expansion influence and patterns.Methods First,we build a rigorous physical model to comprehend the propagation of blue-green lasers in seawater turbulence.By adopting the power spectrum inversion method,phase screens of seawater turbulence are generated to enable the numerical calculation of beam expansion variation,with both seawater parameters and laser parameters considered.Second,theβfactor is employed to evaluate the energy concentration of laser beams on the target plane and thus revealing the beam expansion of lasers by seawater turbulence.Finally,a beam expansion calibration formula for bluegreen lasers propagating in seawater turbulence is proposed via the processing method of the mean square sum.Results and Discussions The estimation results of the scaling law obtained by fitting are compared with those of numerical calculation.The results show that the scaling law matches well with the numerical calculation under certain laser and seawater turbulence parameters.This is under the scenario that the laser parameters fall within the ranges of 0.001-0.100 m for the beam waist radius,1.0-4.0 for the initial beam quality factor,470-550 nm for the wavelength,and−5.0-−0.5 for the

关 键 词：海洋湍流 光束扩展 光传输 定标规律 

分 类 号：TN012[电子电信—物理电子学]