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首页> 外文会议>High-Power Laser Ablation VI pt.1 >Topographic imaging and velocity measurements of surface expansion during laser ablation of a metal layer on glass
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Topographic imaging and velocity measurements of surface expansion during laser ablation of a metal layer on glass

机译：激光烧蚀玻璃上金属层时的表面成像和表面膨胀的速度测量

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We report on the development of novel high-speed techniques to measure the surface topography and instantaneous velocity of ablatively launched thin metal layers with sub-nanosecond temporal resolution. Applications for laser detonator technology require the understanding of laser fiber optical energy deposition and ablative launch of a thin metal layer into an explosive. Characterization of the ablation process requires a time-resolved diagnosis of the ejected material state (topography, velocity, density, pressure, etc.). A pulsed Nd:YAG fiber-coupled laser is used to ablate a 250 nm layer of titanium deposited on a 500 μm thick fused silica substrate at fluences below 10 J/cm~2. Time-resolved imaging of the free expansion of the metal surface is accomplished with Fourier plane imaging using a Shack-Hartmann lenticular array coupled to a fast framing camera. The imager performs topographical surface measurements by detecting changes in the optical wavefront of a reflected picosecond probe laser beam off the expanding surface. Consequently, single-event sub-nanosecond time-resolved "movies" of surface motion dynamics are captured. Crosscheck of the Shack-Hartmann imager is done using advanced velocimetry. A 1550 nm heterodyne laser-based Photonic Doppler Velocimeter is used to measure surface velocity. Using a 1550 nm single mode fiber laser, 10 GHz InGaAs detectors and telecom hardware, we directly record the resulting beat signal produced by the accelerated surface onto a fast digitizer. Free surface velocities as high as 6.5 μms are recorded. Comparisons between the dynamic topography, surface velocimetry and laser hydrocode simulations are presented.
机译：我们报告新的高速技术的发展，以亚纳秒的时间分辨率测量烧蚀发射的薄金属层的表面形貌和瞬时速度。激光雷管技术的应用需要了解激光纤维的光能沉积以及将薄金属层消融地发射到炸药中的知识。消融过程的特征要求对弹出的材料状态（形貌，速度，密度，压力等）进行时间分辨的诊断。使用脉冲Nd：YAG光纤耦合激光器以小于10 J / cm〜2的注量烧蚀沉积在500μm厚度的熔融石英基板上的250 nm钛层。金属表面自由膨胀的时间分辨成像是通过使用Shack-Hartmann双凸透镜阵列和快速成帧相机进行傅里叶平面成像完成的。成像器通过检测离开扩展表面的皮秒探测激光束的光波前变化来执行地形表面测量。因此，捕获了表面运动动力学的单事件亚纳秒时间分辨的“电影”。使用高级测速仪对Shack-Hartmann成像仪进行交叉检查。基于1550 nm外差激光的光子多普勒测速仪用于测量表面速度。使用1550 nm单模光纤激光器，10 GHz InGaAs检测器和电信硬件，我们将加速表面产生的差拍信号直接记录到快速数字转换器上。记录的自由表面速度高达6.5μm/ ns。提出了动态地形，表面测速和激光水力模拟之间的比较。

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