Author Affiliations
Abstract
中国科学院上海光学精密机械研究所高功率激光物理联合实验室, 上海 201800
A theoretical calculation is presented for third-harmonic generation in KDP crystal for type Ⅱ- type Ⅱ polarization-mismatch scheme by using the four-stepped Runge-Kutta method. For the “Shenguang Ⅱ” frequency tripling system, the doubling angle θd and the tripling angle θt are located at optimized situation, by changing detuned values of the polarization angle θp, the corresponding changes of pulse shape properties was gotten. The results show that when the polarization angle θp is located at optimized situation, the full width at half maximum (FWHM) τ is minimum and the pulse shape rises fastest. Increasing the θp from optimized situation causes the τ widens faster and the pulse shape rises slower than decreasing the θp from optimized situation. In the experiment, by changing the polarization angle θp, the pulse shapes consistency of the “Shenguang Ⅱ” eight frequency tripling beams has been accomplished. This work offers a method for adjusting crystals and actualizing power balance.
非线性光学 三倍频波形 偏振分配角 功率平衡 nonlinear optics frequency tripling pulse shape polarization angle power balance Collection Of theses on high power laser and plasma physics
2006, 4(1): 16
中国科学院上海光学精密机械研究所高功率激光物理联合实验室, 上海 201800
使用四阶龙格-库塔算法数值求解Ⅱ类-Ⅱ类偏振失配方案的三倍频稳态耦合波方程组。针对“神光Ⅱ”激光驱动器的三倍频系统，在二倍频匹配角θd和三倍频匹配角θt均处于最佳匹配情况下，以1°为单位改变偏振分配角θp的偏离量，得到对应的三倍频波形特性的变化。研究表明，偏振分配角θp处于最佳理论匹配位时，对应的三倍频波形半峰全宽最窄，且波形上升沿抬起也最快; θp从最佳匹配位增加比从最佳匹配位减小对应的半峰全宽变宽更快，对应的上升沿抬起更慢。根据所得理论结果，在实验中调节偏振分配角θp,达到了改变三倍频输出波形特性，进而实现八路三倍频波形一致的目的。该研究结果对于更快地实现激光驱动器装置的功率平衡有一定的应用价值。
非线性光学 三倍频波形 偏振分配角 功率平衡
Author Affiliations
Abstract
中国科学院上海光学精密机械研究所高功率激光物理国家实验室,上海 201800
This paper discusses a method of characterizing the gain of the laser pulse amplifier using its gain fluence curves and studies gain fluence Curves of a single amplifier．These help US to understand the characteristics of the amplifier and provide a powerful tool for the investigation of the power balance．
放大器 增益通量曲线 功率平衡 amplifier gain fluence curves power balance Collection Of theses on high power laser and plasma physics
2005, 3(1): 28
1 中国科学院上海光学精密机械研究所高功率激光物理国家实验室, 上海 201800
2 上海激光等离子体研究所, 上海 201800
介绍了神光Ⅱ精密化装置中的多路激光功率波形测量系统.该系统在神光Ⅱ装置的八路激光放大链前后共26处进行功率波形数据的采集,并在对采集的数据进行汇总后通过计算机网络将其传输到数据分析处理系统,从而为整个精密化功率平衡项目提供了实时、有效的激光功率波形采样.
激光技木 激光核聚变 功率平衡 功率波形 计算机网络
Author Affiliations
Abstract
中国科学院上海光学精密机械研究所高功率激光物理国家实验室,上海 201800
Power balance between laser beams is important for high-power laser system. This paper uses a calculation method as an exact solution for laser amplification to simulate the output pulse shape of “Shenguang Ⅱ" laser facility. The results are preferable,as compared with the results of the experiments.
模拟计算 激光束 波形 功率平衡 simulative calculation laser beam pulse shape power balance Collection Of theses on high power laser and plasma physics
2004, 2(1): 66
高功率激光物理国家实验室,中国科学院上海光学精密机械研究所,上海,201800
介绍了用于神光Ⅱ装置8路功率平衡的全自动精密小能量测量系统,并用自动控制半波片衰减装置对其性能进行了测定.系统稳定性精度优于1%(rms),量程可达三个量级范围.
功率平衡 小能量测量 半波片衰减器 高精度探头 通道开关
