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拍瓦激光参数诊断过程中,为满足单脉冲信噪比测量仪中周期性极化铌酸锂(PPLN)晶体对光束偏振态的要求,皮秒测量平台的光路排布中采用了立体空间分布结构。针对单脉冲信噪比测量仪快速精确的在线准直要求,推导出马达调整的4×4维线性矩阵的数学模型算法,实现皮秒测量平台立体空间激光光路的快速精确准直。实验结果表明,该准直算法能够保证马达调整3次以下,准直时间2 min以内,实现近场准直精度小于0.16 mm,远场调整精度小于0.17 mrad。满足信噪比测量对准直精度和准直时间的要求,使得信噪比信号获取成功率由10%提升到90%,保障拍瓦激光信噪比实验结果满足总体要求(大于106)。
In order to meet the requirement of the polarization state of the periodically poled lithium niobate (PPLN) crystal in the single-pulse signal-to-noise ratio meter during the process of the parameter estimation of the watt-laser, the spatial arrangement of the optical path of the picosecond measurement platform structure. According to the fast and accurate on-line alignment requirement of single-pulse signal to noise ratio measuring instrument, a mathematical model algorithm of 4 × 4 dimension linear matrix adjusted by motor is deduced to realize the fast accurate collimation of the stereoscopic spatial laser light path of picosecond measurement platform. Experimental results show that the collimation algorithm can ensure that the motor can be adjusted within 3 times and the collimation time within 2 min to achieve near-field collimation accuracy of less than 0.16 mm and far-field adjustment accuracy of less than 0.17 mrad. The accuracy of signal-to-noise ratio (SNR) alignment and collimation time are satisfied. The success rate of signal-to-noise ratio signal acquisition is improved from 10% to 90%. The experimental results of pico-watt laser signal-to-noise ratio meet the overall requirements (greater than 106).