射束均匀性在laser消融产生脉冲的机械耦合评价中的作用
The role of beam homogeneity in mechanical coupling evaluation of laser ablation-generated impulse
摘要：
在激光烧蚀期间从目标表面发射的材料在相反方向上产生净推力（推进）。这种激光驱动推进的能量效率由机械耦合系数（Cm）给出。在这项工作中，我们考虑纳秒紫外激光烧蚀的铝6061合金，研究与不同的照射条件下的Cm行为。这是通过系统地改变：能量密度，均匀/非均匀强度，和激光束的入射角。特别是，我们发现，当处理不均匀的激光强度，特征Cm专门在通量方面是不完全令人满意的，因为在照射区域的能量分布起着关键作用的方式材料被删除-汽化和相爆炸之间的相互作用-和推力产生。
英文摘要：
The material emitted from the target surface during laser ablation generates a net thrust (propulsion) in the opposite direction. The energetic efficiency of this laser-driven propulsion is given by the mechanical coupling coefficient (Cm). In this work we considered nanosecond UV laser ablation of the aluminum 6061 alloy to study the Cm behaviour with different irradiating conditions. This is done by systematically changing: fluence, uniform/nonuniform intensity, and incident angle of the laser beam. In particular we found that, when dealing with nonuniform laser intensity, characterizing Cm exclusively in terms of fluence is not fully satisfactory because the energy distribution over the irradiated area plays a key role in the way material is removed -- interplay between vaporization and phase-explosion -- and thrust is generated.
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