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Title: Relaxation dynamics of nanosecond laser superheated material in dielectrics

Abstract

Intense laser pulses can cause superheating of the near-surface volume of materials. This mechanism is widely used in applications such as laser micromachining, laser ablation, or laser assisted thin film deposition. The relaxation of the near solid density superheated material is not well understood, however. In this work, we investigate the relaxation dynamics of the superheated material formed in several dielectrics with widely differing physical properties. The results suggest that the relaxation process involves a number of distinct phases, which include the delayed explosive ejection of microscale particles starting after the pressure of the superheated material is reduced to about 4 GPa and for a time duration on the order of 1 μs. The appearance of a subset of collected ejected particles in fused silica is similar to that of micro-tektites and provides information about the state of the superheated material at the time of ejection. Lastly, these results advance our understanding of a key aspect of the laser–material interaction pathway and can lead to optimization of associated applications ranging from material processing to laser surgery.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1249137
Report Number(s):
LLNL-JRNL-659895
Journal ID: ISSN 2334-2536
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Optica
Additional Journal Information:
Journal Volume: 2; Journal Issue: 8; Journal ID: ISSN 2334-2536
Publisher:
Optical Society of America
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 36 MATERIALS SCIENCE; laser-induced breakdown; laser materials processing; laser damage; optical materials

Citation Formats

Demos, Stavros G., Negres, Raluca A., Raman, Rajesh N., Feit, Michael D., Manes, Kenneth R., and Rubenchik, Alexander M. Relaxation dynamics of nanosecond laser superheated material in dielectrics. United States: N. p., 2015. Web. doi:10.1364/OPTICA.2.000765.
Demos, Stavros G., Negres, Raluca A., Raman, Rajesh N., Feit, Michael D., Manes, Kenneth R., & Rubenchik, Alexander M. Relaxation dynamics of nanosecond laser superheated material in dielectrics. United States. doi:10.1364/OPTICA.2.000765.
Demos, Stavros G., Negres, Raluca A., Raman, Rajesh N., Feit, Michael D., Manes, Kenneth R., and Rubenchik, Alexander M. Thu . "Relaxation dynamics of nanosecond laser superheated material in dielectrics". United States. doi:10.1364/OPTICA.2.000765. https://www.osti.gov/servlets/purl/1249137.
@article{osti_1249137,
title = {Relaxation dynamics of nanosecond laser superheated material in dielectrics},
author = {Demos, Stavros G. and Negres, Raluca A. and Raman, Rajesh N. and Feit, Michael D. and Manes, Kenneth R. and Rubenchik, Alexander M.},
abstractNote = {Intense laser pulses can cause superheating of the near-surface volume of materials. This mechanism is widely used in applications such as laser micromachining, laser ablation, or laser assisted thin film deposition. The relaxation of the near solid density superheated material is not well understood, however. In this work, we investigate the relaxation dynamics of the superheated material formed in several dielectrics with widely differing physical properties. The results suggest that the relaxation process involves a number of distinct phases, which include the delayed explosive ejection of microscale particles starting after the pressure of the superheated material is reduced to about 4 GPa and for a time duration on the order of 1 μs. The appearance of a subset of collected ejected particles in fused silica is similar to that of micro-tektites and provides information about the state of the superheated material at the time of ejection. Lastly, these results advance our understanding of a key aspect of the laser–material interaction pathway and can lead to optimization of associated applications ranging from material processing to laser surgery.},
doi = {10.1364/OPTICA.2.000765},
journal = {Optica},
number = 8,
volume = 2,
place = {United States},
year = {2015},
month = {8}
}

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Cited by: 10 works
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    In-situ microscopy of front and rear side ablation processes in alkali aluminosilicate glass using ultra short pulsed laser radiation
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    • Grossmann, Daniel; Reininghaus, Martin; Kalupka, Christian
    • Optics Express, Vol. 25, Issue 23
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