Shock Parameter Measurement of Sub-Micrometer Aluminum Driven by Laser Using Frequency Domain Interferometer
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摘要: 针对镀于石英上的亚微米铝膜样品，将飞秒激光（脉宽35 fs、能量0.5 mJ、中心波长800 nm）聚焦其表面，通过激光烧蚀引起铝的快速热膨胀，驱动冲击波传播，使铝样品获得高压加载。透过铝样品背面的石英窗口，采用频域干涉技术，同时测量了冲击径向位移轮廓、粒子速度和冲击波传播速度。通过监测脉冲能量和打靶位置，提高了多发次实验的重复性。采用相位比较算法对实验数据进行分析，实现了亚纳米级的位移分辨率和亚皮秒级的时间分辨率，成功地获得了铝膜在约130 GPa压力下的界面冲击轮廓演化历史。Abstract: For aluminum films with submicron thickness deposited on quartz substrates, femtosecond laser pulses (35 fs pulse width, 0.5 mJ energy, and a central wavelength of 800 nm) were focused on the surface to induce rapid thermal expansion through laser ablation. This process generated shock wave propagation and achieved high-pressure loading on the aluminum samples. Through the quartz window on the backside of the aluminum sample, frequency-domain interferometry was employed to simultaneously measure shock-induced radial displacement profiles, particle velocities, and shock wave propagation velocities. Experimental repeatability for multiple shots was enhanced through pulse energy and shock position monitoring. A phase comparison algorithm was applied for data analysis, achieving sub-nanometer displacement resolution and sub-picosecond temporal resolution. This methodology successfully captured the interfacial shock profile evolution history in the aluminum film under approximately 130 GPa of pressure.
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Key words:
- shock wave /
- femtosecond laser /
- frequency domain interfering /
- equation of state
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图 3 脉冲激光频域干涉测量装置光路示意图
Figure 3. Setup of the optical path of pulse laser frequency domain interferometry measurement
图 5 频域条纹相对相位差计算示意图
Figure 5. Schematic diagram for the relative phase difference of frequency domain fringes
图 7 脉冲频域实验获得的原始干涉图样
Figure 7. Original interference pattern of pulse frequency domain experiment
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