Laser-matter Interaction with Submerged Samples

Mariella, R ; Rubenchik, A ; Norton, M ; Donohue, G ; Roberts, K

Lawrence Livermore National Laboratory

关键词: 36 Materials Science;    Wavelengths;    Ablation;    Comminution;    42 Engineering;   

DOI  :  10.2172/978421
RP-ID  :  LLNL-TR-427603
RP-ID  :  W-7405-ENG-48
RP-ID  :  978421

美国|英语

来源: UNT Digital Library

【 摘 要 】

With the long-term goal in mind of investigating if one could possibly design a 'universal solid-sample comminution technique' for debris and rubble, we have studied pulsed-laser ablation of solid samples that were contained within a surrounding fluid. Using pulses with fluences between 2 J and 0.3 J, wavelengths of 351 and 527 nm, and samples of rock, concrete, and red brick, each submerged in water, we have observed conditions in which {micro}m-scale particles can be preferentially generated in a controlled manner, during the laser ablation process. Others have studied laser peening of metals, where their attention has been to the substrate. Our study uses non-metallic substrates and analyzes the particles that are ablated from the process. The immediate impact of our investigation is that laser-comminution portion of a new systems concept for chemical analysis has been verified as feasible.