磁驱动准等熵压缩下单晶氟化锂的光学特性

以阳加速器和PTS装置为驱动源，开了展单晶氟化锂(LiF，通光方向［100］)窗口材料在准等熵压缩下的光学特性实验研究。应用全光纤激光多普勒探针系统(DPS，激光波长1550 nm)同时测量了Ly12铝材料电极加窗和未加窗的后界面速度历史，结合窗口材料修正方法获取了单晶氟化锂窗口材料在实验条件下折射率随密度的变化和界面粒子速度修正因子。每次实验可获取窗口材料样品的连续加载历史数据，进而处理得到LiF窗口材料在近50 GPa准等熵压力范围内的修正因子。结合拟合的线性关系，进一步处理获得了在实验过程中折射率随密度的变化。将这些实验结果与D.E. Fratanduono, Y. Ma, B.J. Jensen的对应数据比较，其中与光子多普勒测速系统 (PDV, 1550 nm)测量结果基本相符，不确定度与多次冲击实验得到的结果相当。

Optical properties of single-crystal lithium fluoride window under magnetically driven quasi-isentropic compression

A series of experiments were performed on Yang accelerator and PTS facility. We measured velocity histories of electrode panel with/without single crystal ［100］LiF windows by Doppler pins system(DPS, laser wavelength 1550 nm). As the driven panel is not disturbed until the first step of free-surface velocity profile, it is feasible to utilize half of free-surface velocity to estimate sample-window interface velocity. Analyzing apparent velocity profiles of the electrode panel with windows and free-surface, we obtained velocity correction and change of refractive index under magnetically driven quasi-isentropic compression to 50 GPa. Supposing half of free-surface velocity as true velocity, and through linear fit, we obtained the velocity correction factor. Additionally, the relationship between refractive index and density was calculated in the range of experimental conditions by a new procedure. The experiment data measured by photon Doppler velocimetry under 1550 nm laser wavelength are in close agreement with results from D.E. Fratanduono, Y. Ma, B.J. Jensen. The measured uncertainty in this work is as good as several shock experiments.