Frequency modulation (FM)-to-amplitude modulation (AM) conversion is an important factor that affects the time–power curve of inertial confinement fusion (ICF) high-power laser facilities. This conversion can impact uniform compression and increase the risk of damage to optics. However, the dispersive grating used in the smoothing by spectral dispersion technology will introduce a temporal delay and can spatially smooth the target. The combined effect of the dispersive grating and the focusing lens is equivalent to a Gaussian low-pass filter, which is equivalent to 8 GHz bandwidth and can reduce the intensity modulation on the target to below 5% with 0.3 nm @ 3 GHz + 20 GHz spectrum phase modulation. The results play an important role in the testing and evaluating of the FM-to-AM on the final optics and the target, which is beneficial for comprehensively evaluating the load capacity of the facility and isentropic compression experiment for ICF.

The generation and control of large amplitude plasma gratings and other plasma structures is of paramount importance for the realization of plasma photonics. Autoresonant excitation of such structures by means of chirped amplitude-modulated lasers has been recently discussed and analyzed theoretically. Here we discuss the parameter space for the realization of such a scheme and describe the laser system that was built towards this goal. We also expand our earlier theoretical study to account for the more realistic case of a moderately focused laser beam, instead of the simplified plane wave approximation.

为了解决相位生成载波解调方案应用于激光测振技术时，系统中存在的非线性失真问题，提出一种改进相位生成载波解调算法。该算法采用低频、大幅值的相位调制和迭代重加权椭圆特殊拟合对两路含有非线性误差的正交信号进行校正以抑制非线性失真。其中，低频相位调制由三角波信号驱动压电换能器生成，确保小信号情况下椭圆拟合结果的准确性。迭代重加权椭圆特殊拟合可以减小离群数据的影响并避免拟合结果退化为双曲线，具有精度高、鲁棒性好和计算效率高的优点。实验结果表明改进相位生成载波解调算法可以有效抑制激光测振实验系统的非线性失真，在不同相位调制深度（0.8~3.4 rad）下解调信号的信纳比和总谐波失真稳定，对应的标准差分别为0.55 dB和0.03%。系统的响应线性度优于99.99%，动态范围可达103.9 dB @ 500 Hz，总谐波失真为1%且工作频宽为20~8 000 Hz。与传统相位生成载波解调方案相比，该算法不仅显著抑制了非线性失真，还克服了椭圆拟合算法在小信号下无法工作的缺点。

为实现雷达远距离动目标实时跟踪探测，单脉冲线性调频脉冲压缩算法和 V 型啁啾调频脉冲压缩算法为快速获得运动目标的距离速度信息提供算法基础。结合脉冲压缩算法优势以及两种波形脉压算法的弊端，利用V型啁啾调频脉冲发射波形，提出采用三角调频滤波处理方法，以解决目标的距离、径向速度值及速度方向信息同时获取的难题，为单脉冲实现速度矢量信息的隐蔽探测提供解决方案。通过搭建脉冲激光相干测量实验平台，在接收镜头后连接17.618 km延迟光纤以延长目标往返距离，对转速从−3.67~3.67 m/s的转盘进行速度距离测量。在40 MHz调制带宽， ${\text{4}}{\text{.096 μs}}$调制脉宽，2.5 GS/s采样率条件下成功实现单脉冲距离速度多维信息获取，并对测速准确性进行评估，距离测量精度达到0.33 m，速度测量精度为0.061 m/s。

为了实现对波片快轴方位角和延迟量参数快速、高精度测试，提出了一种基于双弹光级联差频调制的波片参数测量方案。选用两个工作频率不相同的弹光调制器级联，构成偏振分析测量装置。波片的两个参数被加载到偏振分析装置的调制信号中，采用数字锁相技术同时提取调制信号的基频项和差频项，然后完成波片全部参数求解。按照原理分析，搭建了实验系统，并完成了系统初始偏移值定标，完成了632.8 nm的1/4波片，532 nm的1/4波片和1/2波片实验测量。实验结果表明，本文方案的快轴方位角测量最大偏差为0.2°，角度测量标准偏差为0.02°；波片的相位延迟量标准偏差优于5.64×10^-4 rad，单点数据测量时间仅为200 ms。考虑到波片材料的双折射色散，根据检测激光波长下测量的相位延迟量，进一步计算出应用波长的波片延迟量。测量值与理论值最大偏差不超过1.17 nm，延迟精度优于λ/300。本文方案实现了高速、高精度和高灵敏的波片参数测量，可为波片加工测试和实验定标提供有效手段。