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相干光探测中,信号光和参考光光斑匹配以及光束特性直接影响探测效率。应用Matlab软件对高斯光斑与平顶光斑的光强分布分别进行仿真,给出两种光斑的数学特征;以声光偏转效应的相干光探测为基础,建立高斯光斑与矩形光斑叠加模型,分析了光斑大小匹配、光轴平移对相干光探测效率的影响。研究结果表明,在保证两束光的准直性及总能量相等的情况下,矩形光斑的能量密度为高斯光斑中心位置的0.8倍时,可获得最佳重叠效率79.6%;非准直状态下信号光与本振光在光敏面的探测效率将会降低,但高斯与矩形混频时在偏离光轴±0.5mm内变化较平缓。
Coherent light detection, the signal light and reference light spot matching and the beam characteristics directly affect the detection efficiency. The Matlab software was used to simulate the light intensity distribution of Gaussian spot and flat-top spot, respectively. The mathematical characteristics of the two spots were given. Based on the coherent light detection of the acousto-optic deflecting effect, the superposition model of Gaussian spot and rectangular spot was established. Spot size matching, optical axis shift on coherent light detection efficiency. The results show that the best overlap efficiency of 79.6% can be achieved when the energy density of the rectangular spot is 0.8 times that of the Gaussian spot under the condition of equal collimation and total energy of the two beams. In the non-collimation state The detection efficiency of the signal light and the local light on the photosensitive surface will be reduced, but the variation of the Gaussian and the rectangular shape within the range of ± 0.5 mm from the optical axis will change more gently.