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光束漂移是激光在大气湍流中传输时的一个重要效应。基于海上大气折射率起伏功率谱模型,推导得出了该环境大气湍流中水平路径光束漂移的理论表达式;为了分析所建立模型的适用性,利用CCD成像技术,在烟台地区近海面环境下开展了多次激光传输实验,分别采集到了不同时间段和不同距离的准直高斯光束漂移实测数据,在弱起伏条件下,将理论预测值与实际测量值进行比较,分析结果表明:两者之间的相对误差值全部低于16%,说明所建立的海上环境光束漂移理论模型能够与实测值较好地吻合。所得到的研究结果将为研究海上环境下光束漂移问题提供更加准确的理论模型。
Beam drift is an important effect when laser light is transmitted in atmospheric turbulence. Based on the sea-atmosphere refractive index fluctuation power spectrum model, the theoretical expression of horizontal path beam drift in atmospheric turbulence is deduced. In order to analyze the applicability of the model, the CCD imaging technique is applied in offshore environment of Yantai A number of laser transmission experiments were carried out, and the measured data of collimated Gaussian beam drifts at different time intervals and different distances were collected respectively. The theoretical predictions and actual measured values were compared under the weak undulation conditions. The results showed that: The relative errors of the two models are all less than 16%, which shows that the theoretical model of offshore beam drift can be well fitted with the measured values. The results obtained will provide a more accurate theoretical model for studying the beam drift problem in offshore environment.