两级喇曼压缩系统配偏振干涉仪诊断等离子体电子密度
Plasma electron density diagnosis by Nomarski interferometer with Raman compression cascade system
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摘要: 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308 nm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。308 nm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308 nm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。Abstract: Nomarski interferometer is an effective measurement to diagnose the electron density of laser-produced plasma. Using Raman compression cascade system with 1 054 nm incident light, a probe beam that has a 308 nm wavelength, 28 ps pulse duration and 1 mJ energy was obtained. The probe beam was applied in the polarization interferometry to measure the electron density of Au plasmas produced by 527 nm main beam at Xingguang-Ⅱ facility. The measured interferograms were analyzed to and a two-dimension profile of electron density was obtained. The result shows that with the aid of the probe beam, the electron density can be probed with a much higher temporal resolution and the disturbance of harmonic can be effectively avoided.
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Key words:
- polarization interferometer /
- laser-produced plasma /
- electron density /
- abel transform
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