束匀滑激光照射下等离子体二次谐波特性研究
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摘要: 在“星光II”装置上，采用束匀滑的基频光打靶条件下，用光纤阵列配光学多道分析仪在六个角度观测二次谐波发射的积分光谱，通过对共振吸收峰波长移动和峰宽度的测量，求出临界区域运动速度，并研究了散射光强与出射角度的关系。Abstract: Time-integrated spectra of second harmonic (2w ) light emission from plasmas produced with 1.053m m laser are simultaneously measured at several scattering-angles on Xingguang II laser facility. The spectra show that 2w light is just due to resonance absorption, and ion-acoustic decay instability is suppressed. The mean velocity of critical surface and its variation during laser pulse are inferred from the spectra. Moreover, the relationship between scattered light intensity and scattering angle is also acquired.
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Key words:
- resonance absorption /
- critical surface /
- ion-acoustic decay instability
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