论文部分内容阅读
建立圆环形聚焦平面光束通过Kolmogorov湍流大气的远场传输模型,考虑实际CCD所存在的“死区”及非线性饱和效应等非线性光电响应特征,以中心遮拦比为0.5的圆环形聚焦光束为例,分别计算了其通过不同强度湍流大气传播至远场焦平面上的实际真实远场光强分布曲线和CCD测量远场光强分布曲线,并以峰值斯特雷尔比RS、光束质量因子β和环围能量比Ree三种参数作为评价远场光斑质量的指标,考察了死区大小以及光斑非线性饱和程度对实际远场光强分布的测量和光束质量评估的影响,对计算结果以及减小测量误差的解决途径进行了分析讨论。
The far-field transmission model of circularly focused planar beam through the Kolmogorov turbulent atmosphere is established. Considering the non-linear photoelectric response characteristics such as “dead zone ” and nonlinear saturation effect of CCD, Shaped focused beam as an example, the real far-field light intensity distribution curve and the far-field light intensity distribution curve measured by far-field focal plane propagating through different intensity turbulent atmosphere are calculated respectively, and the peak Strayr than RS , The beam quality factor β and the energy ratio Ree of the surrounding are used as indexes to evaluate the far field spot quality. The effects of the size of the dead zone and the non-linear saturation of the spot on the measurement of the actual far field light intensity and the beam quality assessment are investigated. The calculation results and the ways to reduce the measurement error are analyzed and discussed.