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在星光Ⅱ铷玻璃激光装置上,采用两级喇曼压缩系统产生的波长为308nm的紫外光作为探针束,配合Nomarski偏振干涉仪对金平面靶冕区激光等离子体进行诊断。308nm光具有波长短、亮度高、脉冲时间短、相干性好的优点,作为探针束诊断冕区产生的等离子体电子密度,可以与高功率激光装置打靶激光同步,实现有效地脉冲压缩,同时避免等离子体中谐波分量的干扰。实验获得了308nm紫外探针光偏振干涉条纹图,在研究Abel反演算法的基础上,利用自行研制的基于Windows操作系统的实验数据处理软件,对实验数据进行了处理和分析,得到了冕区等离子体电子密度的空间分布。结果表明两级喇曼压缩系统配偏振干涉能有效抑制主束谐波影响,以更高时间分辨测量等离子体的更高密度区域。
In the Star Ⅱ rubidium glass laser device, a two-stage Raman compression system was used to generate ultraviolet light with a wavelength of 308 nm as a probe beam, and a Nomarski polarization interferometer was used to diagnose the laser plasma in the coronal plane of the gold plane. 308nm light has the advantages of short wavelength, high brightness, short pulse time and good coherence. As a probe beam, the plasma electron density generated in the corona area can be synchronized with the laser light of the high-power laser device to achieve effective pulse compression, meanwhile, Avoid interference with harmonic components in the plasma. Based on the Abel inversion algorithm, experimental data processing software based on Windows operating system, which was developed by ourselves, was used to process and analyze the experimental data. The coronal region Spatial distribution of plasma electron density. The results show that the two-stage Raman compression system with polarization interference can effectively restrain the influence of main-beam harmonics and resolve the higher-density region of the plasma with higher time resolution.