在使用高功率激光装置进行物理实验时,高精度时间同步的时标系统是实现物理过程精确诊断的必要条件。为了满足物理实验需求,该系统采用任意波形发生器输出信号时分复用结合高速电光调制的技术方案,同源产生了主激光、时标光、电时标和高精度触发信号等多路信号。时标系统共可输出532,355,266 nm三种波长共10路梳状时标光信号及8路梳状电时标信号、两路快前沿高幅值触发信号。时标信号与主激光时间同步抖动峰峰值达到12.80 ps,梳状时标光信号脉冲周期峰值抖动为6.40 ps,接近目前采用的测量系统极限。完成了时标系统在高功率激光装置中的应用演示,满足了诊断设备应用要求;对条纹相机不同扫程进行时间基准标定实验,可有效校准相机大扫程的时间误差。

理论分析了基于边缘加热条件下气冷钕玻璃放大器的热致波前畸变, 模拟计算了不同加热温度下钕玻璃片的温度分布和热波前畸变分布, 并进行了实验验证。结果表明, 数值模拟与实验结果能较好地吻合, 在产热率为0.6 W/cm3时, 钕玻璃片产生的热波前畸变随着边缘温度的增加而减小, 而当边缘温度达到90 ℃时, 热波前畸变开始出现反转, 随温度增加而增加。合理设计边缘加热结构和优化加热温度, 能有效抑制气冷钕玻璃放大器的热波前畸变。

When high-power solid laser working in high repetition rate, the laser output wave-front changes due to the thermal distortion, which is caused by the gain medium under the heat deposition. Therefore, the coherent modulation imaging technology is used to realize the measurement of the laser output wave-front from one frame of diffraction intensity recorded. The phases of thermal distortion of the optical element are obtained when the amplifier working in 1, 5, 7 Hz frequency. Experimental results show that thermal distortion effect is significantly increased, the heat is concentrated toward the center region and the phase change increases as the working frequency increases.

高功率固体激光器工作在高重复频率时，增益介质因热量的沉积而发生热畸变，导致激光输出波前发生变化。为此，利用相干调制成像技术通过记录单幅衍射光斑实现输出光场的波前测量，获得了放大器工作在1,5,7 Hz频率时光学元件的热畸变相位。实验结果显示，随着工作频率增大，热量向中心区域集中，热沉积效应明显增加了波前变化。

Thermal effect is still the most serious problem: it restricts the high power and high beam quality of solid laser to be further enhanced. The efficient thermal management is an important approach to suppress the thermal effect. In this paper, the thermal effect in a gas-cooled laser diode pumped multislab Nd:glass amplifier operating at a repetition rate is investigated in detail both theoretically and experimentally. The three-dimensional distributions of temperature, stress, strain, and birefringence are calculated by a finite element analysis. Based on these data, the thermally induced wavefront distortions and depolarization losses are determined with considering six slabs and one laser head. It is revealed that the theoretical data are in good agreement with the experimental results: the total wavefront distortion is 6.77λ and a depolarization loss of more than 90% accumulates over six slabs when the heat deposition is 0.7 W/cm3.

Laser diode pumped solid-state lasers (DPSSL) has become an important way to realize the next generation of laser-driven device for energy conversion efficiency and repetition rate requirements. High repetition frequency leads to heat accumulation on the memory medium, which will cause thermo-optical effect, elasto-optical effect and bulk displacement, then resuls in the generation of wavefront distortion and affects the beam quality. Aimed at 100 J output energy and 10 Hz repetition frequency amplifier module, the extraction efficiency and gain performance storage are analyzed, and the sheet laser diode pumped amplifier module structure is designed using gas cooling technology. Thermal analysis models of single slice amplifier are established using the finite element analysis. The influence of signal slice thickness and convective heat transfer coefficient to the wavefront distortion are researched, in consideration of the limitation of the total wavefront distortion, we obtain the optimal value of single slice thickness. Using super-Gaussian beam on behalf of pump source and considering the distribution of helium gas flow, we analysis the thermal designed data and simulate the temperature, bulk displacement and stress distribution to get the related wavefront distortions.

激光二极管抽运的固体激光器（DPSSL）成为实现下一代激光器驱动装置对能量转换效率和重复频率要求的重要途径。高重复频率导致介质内存在热积累，引起热光效应、弹光效应和形变，导致波前畸变的产生，影响光束质量。针对目标输出能量100 J，重复频率10 Hz的放大模块，分析其储能提取效率和增益性能，采用气体冷却技术，设计激光二极管抽运的片状放大模块结构。利用有限元数值分析方法，建立了该装置单片放大器热分析模型，研究了单片增益介质厚度、对流换热系数对波前畸变的影响，结合波前畸变的要求，得到了单片厚度的最优值，并对该设计进行热分析，利用超高斯光束近似抽运光源，结合氦气气流分布情况，模拟单片介质的温度、形变和应力分布，计算得到了热光效应、形变和弹光效应对波前畸变的贡献以及单片增益介质的总波前。

研究了在不同温度下单模光纤受激布里渊散射的阈值和频移，从受激布里渊散射的基本原理出发，分析和讨论了温度对受激布里渊散射阈值和频移特性的影响.设计并搭建了实验系统，测量了不同温度下2 km单模光纤受激布里渊散射的光谱和阈值，实验表明，随着温度的升高，布里渊频移逐渐增大，在一定温度范围内，布里渊频移与温度呈线性关系。低温对斯托克斯光有抑制作用，温度越低受激布里渊散射阈值越高。

利用低温工作状态下Yb∶YAG再生放大器，对1030 nm光纤锁模激光器输出的250 pJ的种子光进行放大。电光开关门宽控制种子光在放大器内20程往返，最大单脉冲能量为217 μJ，输出频率10 Hz，同时由于其增益窄化效应光谱宽度由8.9 nm减小到0.3 nm，相应的脉宽由18.0 ps被压缩到5.5 ps，这与理论模拟结果的0.4 nm，4.2 ps基本吻合。实验结果论证了采用窄增益带宽的再生放大器可以同时实现亚皮秒光参量啁啾脉冲放大(OPCPA)对抽运脉冲宽度和光谱宽度的要求，避免使用光纤光栅对光谱滤波带来的高阶非线性效应。