Focal spot measurement technology of multi-beam laser bunching
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摘要: 为了实现多路激光集束焦斑测量，给出其时间和空间分辨的特性，搭建了基于成像系统、光电管结合示波器、条纹相机和科学CCD等主要部件组成的焦斑光学测试平台。实验之前，对科学CCD的灵敏度和动态范围及条纹相机增益系数、狭缝宽度、扫描时间等性能参数进行离线测试标定。采用CCD测试多路激光时间积分的集束焦斑空间分布；采用光电管结合示波器及条纹相机对多路激光到达靶点的时间同步进行测试；开展高质量集束焦斑的时间分辨特性测试，获得了光谱色散匀滑光束焦斑精细的时空演化图像。多路激光集束焦斑形态及多路光束时间同步测试为提升高功率激光装置焦斑测试技术和方法提供了支撑。Abstract: To realize multi-channel laser cluster focal spot measurement and give its temporal and spatial resolution characteristics, a focal spot optical measurement platform based on imaging system, photodiode combined with oscilloscope, streak camera and scientific CCD is built. Before the experiment, the sensitivity and dynamic range of the scientific CCD and the performance parameters of the streak camera, such as gain coefficient, slit width and scanning time, were tested and calibrated off-line. The CCD is used to measure the spatial distribution of multi-channel laser cluster focal spot with time integration. By using photodiode combined with oscilloscope and streak camera, the time synchronization of multi-channel laser reaching the target is tested. The time-resolved characteristics of high-quality cluster focal spot are measured, and the fine spatio-temporal evolution image of spectral dispersion smooth beam focal spot is obtained. The test of focal spot shape and time synchronization of multi-beam channel laser cluster provide support for improving focal spot test technology and method of high-power laser device.
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Key words:
- multi-beam laser facility /
- focal spot /
- time-resolved /
- synchronization
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图 4 积分的集束焦斑形貌及焦斑能量集中度
Figure 4. Image of multi-beam laser bunching and energy concentration distribution
图 6 二路光束到达靶点的“零同步差”图像
Figure 6. “Zero synchronization difference” image of two beams reaching the target
图 7 条纹相机采集的图像及增益系数与相对强度灰度关系
Figure 7. Image captured by the streak camera and the relation between gain coefficient and intensity gray
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