Multiscale Investigation of Femtosecond Laser Pulses Processing Aluminum in Burst Mode

Rong, Yiming1; Ji, Pengfei2; He, Mengzhe1; Zhang, Yuwen3; Tang, Yong2

2018

10.1080/15567265.2018.1497111

Nanoscale and Microscale Thermophysical Engineering   Impact Factor & Quartile

1556-7265

1556-7273

Megahertz is the highest femtosecond laser repetition rate that the state-of-the art technology can achieve. In this article, a single femtosecond laser pulse is burst into multiple femtosecond laser pulses to process aluminum. The temporal gap between two consecutive burst pulses is 2 picoseconds, which is much shorter than the temporal gap between two consecutive pulses at the repetition rate of megahertz. By taking the thermophysical scenarios of femtosecond laser induced of electron thermalization, electron heat conduction, electron-phonon-coupled heat transfer and atomic motion into account, a multiscale framework integrating ab initio quantum mechanical calculation, molecular dynamics and two-temperature model are constructed. The effect of femtosecond laser pulse number on the incubation phenomenon is studied. Comparing with the single pulse-processing aluminum film, the femtosecond laser in burst mode leads to smaller thermal stress, which is favorable to reduce the thermal mechanical damage of the material beneath the laser-irradiated surface. Appreciable differences among the simulation results by using electron thermophysical parameters from ab initio quantum mechanical calculation and those from experimental measurement, empirical estimation and calculation are found, indicating the essentials to precisely model the electron thermal response subject to femtosecond laser excitation.

Femtosecond laser electron-phonon-coupled heat transfer multiscale modeling laser burst mode

SCI ; EI

English

First

China Postdoctoral Science Foundation[2017M612653]

Thermodynamics ; Engineering ; Science & Technology - Other Topics ; Materials Science ; Physics

Thermodynamics ; Engineering, Mechanical ; Nanoscience & Nanotechnology ; Materials Science, Characterization & Testing ; Physics, Applied

WOS:000447198400004

TAYLOR & FRANCIS INC

20183505742250

Beryllium minerals ; Calculations ; Electrons ; Femtosecond lasers ; Heat conduction ; Laser excitation ; Molecular dynamics ; Phonons ; Pulse repetition rate ; Quantum theory ; Surface structure

Minerals:482.2 ; Heat Transfer:641.2 ; Lasers, General:744.1 ; Laser Applications:744.9 ; Physical Chemistry:801.4 ; Mathematics:921 ; Quantum Theory; Quantum Mechanics:931.4

Web of Science

1.Southern Univ Sci & Technol, Dept Mech & Energy Engn, Shenzhen Key Lab Addit Mfg High Performance Mat, Shenzhen, Peoples R China
2.South China Univ Technol, Sch Mech & Automot Engn, Guang Dong Higher Educ Inst, Key Lab Surface Funct Struct Mfg, Guangzhou 510640, Guangdong, Peoples R China
3.Univ Missouri, Dept Mech & Aerosp Engn, Columbia, MO 65211 USA

Rong, Yiming,Ji, Pengfei,He, Mengzhe,et al. Multiscale Investigation of Femtosecond Laser Pulses Processing Aluminum in Burst Mode[J]. Nanoscale and Microscale Thermophysical Engineering,2018,22(4):324-347.

Rong, Yiming,Ji, Pengfei,He, Mengzhe,Zhang, Yuwen,&Tang, Yong.(2018).Multiscale Investigation of Femtosecond Laser Pulses Processing Aluminum in Burst Mode.Nanoscale and Microscale Thermophysical Engineering,22(4),324-347.

Rong, Yiming,et al."Multiscale Investigation of Femtosecond Laser Pulses Processing Aluminum in Burst Mode".Nanoscale and Microscale Thermophysical Engineering 22.4(2018):324-347.