CAJ | 학술논문

提出了描述整个飞秒多脉冲激光烧蚀过程的物理模型,模型考虑了多脉冲烧蚀的新的特点,考虑靶材吸收率随温度的变化和蒸发效应,建立了激光烧蚀不同阶段的热传导方程,给出了相应的定解条件.以金靶材为例,利用有限差分法,求解了热传导动力学方程,分别给出单脉冲和多脉冲作用下相应的靶材电子和离子亚系统的温度演化图像,及多脉冲激光作用下能量剩余系数和脉冲个数的变化规律,发现理论曲线与相应的实验数据吻合较好.研究结果充分证明多脉冲激光烧蚀过程中剩余能量的存在.
제출료묘술정개비초다맥충격광소식과정적물리모형,모형고필료다맥충소식적신적특점,고필파재흡수솔수온도적변화화증발효응,건립료격광소식불동계단적열전도방정,급출료상응적정해조건.이금파재위례,이용유한차분법,구해료열전도동역학방정,분별급출단맥충화다맥충작용하상응적파재전자화리자아계통적온도연화도상,급다맥충격광작용하능량잉여계수화맥충개수적변화규률,발현이론곡선여상응적실험수거문합교호.연구결과충분증명다맥충격광소식과정중잉여능량적존재.
A new theoretical model has been developed to describe the whole ablation process, including the effect of dynamic absorptance and evaporation. Taking gold as an example, a finite difference method is employed to simulate the electron and lattice temperature evolution under the irradiation of single and multipulse femtosecond laser. The evolution of residual energy coefficient for multipulse as a function of pulse number is given. It is found that the calculated coefficients are in good agreement with the corresponding experimental data, proving the existence of residual energy during femtosecond multipulse ablation.