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Journal of Applied Physics / Volume 110 / Issue 11 / ARTICLES / Lasers, Optics, and Optoelectronics

J. Appl. Phys. 110, 113102 (2011); http://dx.doi.org/10.1063/1.3662897 (7 pages)

Optical properties and thermal response of copper films induced by ultrashort-pulsed lasers

Yunpeng Ren, J. K. Chen, and Yuwen Zhang

Department of Mechanical and Aerospace Engineering, University of Missouri, Columbia, Missouri 65211, USA

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(Received 1 September 2011; accepted 16 October 2011; published online 1 December 2011)

A critical point model with three Lorentzian terms for interband transition was proposed to describe temperature-dependent reflectivity (R) and absorption coefficient (α) for copper irradiated by ultrashort-pulsed lasers of wavelength 200–1000 nm. After validated with experimental data at room temperature, it was incorporated into a two-temperature model to study ultrafast laser-material interactions. The dynamic changes of optical properties R and α, distributions of laser heat density, electron and lattice temperature, and phase changes of a copper film were investigated. Comparing with the experimental data of average absorption showed that the proposed two-temperature model together with the critical point model can simulate satisfying results for temperature-dependent R and α. The drastic changes in R and α could alter laser energy deposition in a heated target, leading to different thermal responses than those predicted with constant R and α at room temperature.

© 2011 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. DIELECTRIC FUNCTION MODELS
  3. TWO-TEMPERATURE MODEL
  4. NUMERICAL RESULTS AND DISCUSSION
  5. CONCLUSIONS

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KEYWORDS and PACS

Keywords

absorption coefficients, copper, critical points, high-speed optical techniques, laser beam effects, laser deposition, metallic thin films, reflectivity

PACS

  • 78.66.Bz

    Metals and metallic alloys

  • 85.40.Sz

    Deposition technology

  • 61.82.Bg

    Metals and alloys

  • 78.20.Ci

    Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3662897

PUBLICATION DATA

ISSN

0021-8979 (print)  
1089-7550 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
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