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在惯性约束聚变研究中,时标激光是对物理诊断数据进行分析的重要时间标尺,而任意反射面速度干涉仪(VISAR)光源则是冲击波精密诊断必不可少的探针光源.通过对物理需求的分析,提出对时标激光与VISAR光源共用脉冲产生单元,采用时分复用技术实现二者在同一台幅度调制器上的精密整形,经1×2分束后再通过声光开关进行选择输出,从而降低了系统造价,便于集中控制.采用了脉冲稳偏、高稳定空间放大、高精度温控谐波转换技术及可快速插拔精密复位的光纤耦合和传能技术,实现了时标和VISAR光源脉冲的高稳定输出.研制的时标激光系统可产生与主激光高精度同步的12路二倍频、4路三倍频时标信号,为神光-III激光装置物理实验提供了重要的时间基准.产生的VISAR光源脉冲在经过光纤系统和Nd:YAG棒状放大器后,通过温控LBO晶体倍频,然后经1 mm芯径的多模传能光纤传输至成像型VISAR系统,为物理实验提供了单纵模、高亮度、可精密整形的脉冲激光.系统已用于VISAR诊断物理实验,获得了完整的冲击加载、减速的图像,从而为冲击波调速及相关高压物理实验提供了可靠的技术手段.
In inertial confinement fusion, time-lasing laser is an important time scale for the analysis of physical diagnostic data, while the VISAR light source is an indispensable probe light source for the precision diagnosis of shock wave. , Proposed to share the pulse generation unit with the time-lasered laser and the VISAR light source. The time-division multiplexing technique is used to realize the precise shaping of the two on the same amplitude modulator. After the 1 × 2 splitting, the output is selectively output through the acousto-optic switch , Which reduces the system cost and facilitates the centralized control.The pulse stabilization, high stability space amplification, high precision temperature-controlled harmonic conversion technology and the optical fiber coupling and transmission technology that can quickly insert and tear the precision reset are adopted, VISAR light pulse high stability output.Developed time-lasing laser system can produce high-precision synchronization with the main laser 12 times the frequency of the double, 4 times the frequency signal of the third frequency, which is important for SG-III laser device physics experiment provides important Of the time base.The resulting VISAR light source pulse passes through a fiber-optic system and a Nd: YAG rod amplifier, passes through a temperature-controlled LBO crystal multiplier and then passes through a 1 mm core multimode fiber To imaging VISAR system, which provides a single longitudinal mode, high brightness and precision shaping pulsed laser for physics experiment.The system has been used in VISAR diagnostic physics experiment to get complete impact loading and deceleration images, And related high-pressure physical experiments provide a reliable technical means.