Modulation and mechanism of shockwaves induced on metals by femtosecond laser double-pulse

Guoyan Wang, Jingya Sun, Pengfei Ji, Jie Hu, Jiaxin Sun, Qingsong Wang, Yongfeng Lu

Research output: Contribution to journalArticle

Abstract

An ultrafast pump-probe shadowgraph imaging system and a laser induced breakdown spectroscopy (LIBS) system were used to investigate the modulation and mechanism of shockwaves of nickel (Ni) and aluminum (Al) induced by femtosecond laser double-pulse. With a suitable pulse delay, the bulge in the axial direction of the shockwave can be effectively eliminated and the shockwave expanded evenly in a hemispheric structure. The radial expansion distance of shockwaves of Ni and Al increased by 30% and 50% respectively with double-pulse excitation. The strong coupling of laser with liquid layer and plasma shielding effect were responsible for the enhancement of shockwaves within different regimes of pulse delay. Different enhancement trends were observed for the shockwaves of Ni and Al in the initial regime of pulse delay. Further study indicated that the reduced ablation volume of Al counteracted the enhancement effect of double-pulse on plasma and shockwave and it was the dominant mechanism for the stagnant of Al shockwave. The LIBS results of Ni and Al showed good agreement with the increasing tendency of shockwaves and confirmed the non-negligible effect of the removal volume on the intensity of plasma and shockwave. The results and mechanism exhibited the potential of femtosecond laser double-pulse in plasma and shockwave modulation and application.

Original languageEnglish (US)
Article number165104
JournalJournal of Physics D: Applied Physics
Volume53
Issue number16
DOIs
StatePublished - Apr 15 2020

Keywords

  • femtosecond laser double-pulse
  • mechanism
  • pump probe
  • shockwave/plasma dynamics and modulation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films

Fingerprint Dive into the research topics of 'Modulation and mechanism of shockwaves induced on metals by femtosecond laser double-pulse'. Together they form a unique fingerprint.

  • Cite this