固体超快laser加热中的过渡区
Transition regime in the ultrafast laser heating of solids
摘要：
基于热扩散的唯象理论，我们证明了吸收激光脉冲后产生的峰值温度$T_{\text{max}}$强烈地依赖于脉冲宽度。我们确定了三种不同的热传导制度，可以通过一个简单的参数，仅取决于脉冲持续时间和材料常数。支持唯象的方法的热扩散和测量的热表面膨胀后，瞬态光栅激发1 ps和10 ns的光脉冲的数值模拟。
英文摘要：
Based on the phenomenological theory of heat diffusion, we show that the generated peak temperature $T_{\text{max}}$ after absorption of a laser pulse strongly depends on the pulse duration. We identify three different heat conduction regimes which can be identified via a simple parameter that depends only on the pulse duration and on material constants. The phenomenological approach is supported by numerical simulations of heat diffusion and measurements of the thermal surface expansion after transient grating excitation with 1 ps and 10 ns optical pulses.
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