利用激光大气传输四维程序,建立了双望远镜中继镜系统上行传输模型,研究了孔径匹配对中继镜系统上行传输的影响.选择去除畸变相位后接收光场的远场峰值功率密度作为中继镜系统上行传输的性能指标,通过光束在真空中传输的计算,得到了接收口径一定时不同发射口径对应的最优发射焦距,并对不同发射功率激光在大气中上行传输的情况进行了模拟计算.结果表明,当接收孔径一定时,随着发射孔径的增大,最优发射焦距减小；增大发射孔径,可以增大临界发射功率；当发射功率较小时,在一定发射口径范围内,发射口径的变化对中继镜系统上行传输的性能指标影响不大,当发射功率较大时,增大发射口径可以有效提高中继镜系统上行传输的性能指标.
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