Chin. Phys. B ›› 2013, Vol. 22 ›› Issue (4): 45203-045203.doi: 10.1088/1674-1056/22/4/045203

• PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES • 上一篇    下一篇

Selective triggering of phase change in dielectric by femtosecond pulse trains based on electron dynamics control

徐传彩, 姜澜, 冷妮, 刘鹏军   

  1. NanoManufacturing Fundamental Research Joint Laboratory of National Natural Science Foundation of China, School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
  • 收稿日期:2012-08-07 修回日期:2012-09-25 出版日期:2013-03-01 发布日期:2013-03-01
  • 基金资助:
    Project supported by the National Basic Research Program of China (Grant No. 2011CB013000) and the National Natural Science Foundation of China (Grant Nos. 90923039 and 51025521).

Selective triggering of phase change in dielectric by femtosecond pulse trains based on electron dynamics control

Xu Chuan-Cai (徐传彩), Jiang Lan (姜澜), Leng Ni (冷妮), Liu Peng-Jun (刘鹏军)   

  1. NanoManufacturing Fundamental Research Joint Laboratory of National Natural Science Foundation of China, School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
  • Received:2012-08-07 Revised:2012-09-25 Online:2013-03-01 Published:2013-03-01
  • Contact: Jiang Lan E-mail:jianglan@bit.edu.cn
  • Supported by:
    Project supported by the National Basic Research Program of China (Grant No. 2011CB013000) and the National Natural Science Foundation of China (Grant Nos. 90923039 and 51025521).

摘要: In this study we experimentally reveal that the phase change mechanism can be selectively triggered by shaping femtosecond pulse trains based on electron dynamics control (EDC), including manipulation of excitations, ionizations, densities, and temperatures of electrons. By designing the pulse energy distribution to adjust the absorptions, excitations, ionizations, and recombinations of electrons, the dominant phase change mechanism experiences transition from nonthermal to thermal process. This phenomenon is observed in quadruple, triple, and double pulses per train ablation of fused silica separately. This opens up possibilities for controlling phase change mechanisms by EDC, which is of great significance in laser processing of dielectric and fabrication of integrated nano- and micro-optical devices.

关键词: phase change, electron dynamics, pulse shaping

Abstract: In this study we experimentally reveal that the phase change mechanism can be selectively triggered by shaping femtosecond pulse trains based on electron dynamics control (EDC), including manipulation of excitations, ionizations, densities, and temperatures of electrons. By designing the pulse energy distribution to adjust the absorptions, excitations, ionizations, and recombinations of electrons, the dominant phase change mechanism experiences transition from nonthermal to thermal process. This phenomenon is observed in quadruple, triple, and double pulses per train ablation of fused silica separately. This opens up possibilities for controlling phase change mechanisms by EDC, which is of great significance in laser processing of dielectric and fabrication of integrated nano- and micro-optical devices.

Key words: phase change, electron dynamics, pulse shaping

中图分类号:  (Laser ablation)

  • 52.38.Mf
64.70.kj (Glasses) 78.20.Jq (Electro-optical effects)