飞秒激光作用下金属箔材的温度场研究
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摘要
为分析飞秒激光作用下金属材料的温度场及其影响因素,基于一维双温模型对飞秒激光作用下铜箔的温度场进行数值求解。采用脉宽100~800 fs,能量密度509.30~2 546.48 J/m2的激光参数进行计算,研究电子和晶格温度随时间和深度的变化规律。结果表明,电子温度在10-13s时间尺度达到峰值,在此期间晶格温度保持不变,此后通过耦合作用二者在几ps时间尺度达到热平衡;脉宽越短,电子温升越快、峰值温度越高、耦合时间越短;而能量密度越大,电子温升越快、峰值温度越高、耦合时间越长。
the temperature field of copper foil with femtosecond laser pulse based on the two temperature model is numerically calculated to analyze the temperature field in metal and its influencing factors. The evolution rules of the electron and lattice temperature with time and depth are studied with a laser pulse width from 100 to 800 fs and a laser pulse energy density from 509. 30 to 2 546. 48 J / m2. Results show that the electron temperature peaks in 10- 13 s while the lattice temperature remains constant with a thermal equilibrium of the two achieved in several picoseconds. A shorter laser pulse width leads to faster electron temperature rise,higher peak temperature and shorter electronic and lattice coupling. And a higher laser energy density results in faster electron temperature rise,higher peak temperature but longer electronic and lattice coupling time.
the temperature field of copper foil with femtosecond laser pulse based on the two temperature model is numerically calculated to analyze the temperature field in metal and its influencing factors. The evolution rules of the electron and lattice temperature with time and depth are studied with a laser pulse width from 100 to 800 fs and a laser pulse energy density from 509. 30 to 2 546. 48 J / m2. Results show that the electron temperature peaks in 10- 13 s while the lattice temperature remains constant with a thermal equilibrium of the two achieved in several picoseconds. A shorter laser pulse width leads to faster electron temperature rise,higher peak temperature and shorter electronic and lattice coupling. And a higher laser energy density results in faster electron temperature rise,higher peak temperature but longer electronic and lattice coupling time.
引文
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[8]Wu Benxin,Tao Sha,Lei Shuting.Numerical modeling of laser shock peening with femtosecond laser pulses and comparisons to experiments[J].Applied Surface Science,2010,256(13):4376-4382.
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[12]许伯强,张子国,徐晨光,等.微纳米薄膜材料中激光皮秒超声的数值模拟[J].江苏大学学报:自然科学版,2012,33(1):83-87.
[2]Vogel A,Noack J,Hüttmann G,et al.Mechanisms of femtosecond laser nanosurgery of cells and tissues[J].Applied Physics B,2005,81(8):1015-1047.
[3]Jiang Lan,Tsai Hailung.Improved two-temperature model and its application in ultrashort laser heating of metal films[J].Journal of Heat Trans,2005,127(10):1167-1173.
[4]陈安民,姜远飞,刘航,等.双温方程用于飞秒激光烧蚀金属的模拟分析[J].激光与红外,2012,42(8):847-851.
[5]Anisimov S I,Kapeliovich B L,Perelman T L.Electron emission from metal surfaces exposed to ultrashort laser pulses[J].Soviet Physics Journal of Experimental and Theoretical Physics,1974,39(2):375-377.
[6]倪晓昌,王清月.飞秒、皮秒激光烧蚀金属表面有限差分热分析[J].中国激光,2004,31(3):277-280.
[7]邓素辉,陶向阳,刘明萍,等.飞秒-纳秒脉冲激光烧蚀金属热效应分析[J].激光技术,2007,31(1):4-7.
[8]Wu Benxin,Tao Sha,Lei Shuting.Numerical modeling of laser shock peening with femtosecond laser pulses and comparisons to experiments[J].Applied Surface Science,2010,256(13):4376-4382.
[9]Chen J K,Tzou D Y,Beraun J E.A semiclassical two-temperature model for ultrafast laser heating[J].International Journal of Heat and Mass Transfer,2006,49(1):307-316.
[10]陈安民.超短脉冲激光烧蚀金属靶[D].长春:吉林大学,2009.
[11]石云飞,卢立中,王纪俊,等.耦合系数对激光辐照金属材料温度场的影响[J].激光与红外,2011,41(3):252-258.
[12]许伯强,张子国,徐晨光,等.微纳米薄膜材料中激光皮秒超声的数值模拟[J].江苏大学学报:自然科学版,2012,33(1):83-87.