CO2 laser resonant excitation of propylene molecules in diamond deposition using combustion-flame method

Z. Q. Xie, H. Ling, Y. X. Han, X. K. Shen, T. Gebre, Y. F. Lu

Research output: Contribution to conferencePaperpeer-review

Abstract

CO2 laser resonant excitation of propylene molecules was investigated in propylene/oxygen (C3H6/O2) combustion diamond deposition in open air. The wavelength of the CO2 laser is 10.591 μm, while the central wavelength for the C-H vibration mode in propylene molecules is 10.684 μm. The absorption peak of this mode is broadened by the high ambient pressure and the flame temperature, and thus covers the CO2 laser wavelength to enable the resonant absorption. The inner cone of the C3H6/O2 flame became shorter and brighter with the CO2 laser irradiation with a laser power of 800 W. The scanning electron microscopy (SEM) images showed that better crystal grains in the diamond films were deposited with the CO2 laser excitation. The film thickness also had an obvious increase within the same deposition time, indicating a higher growth rate of diamond films. The effect of different positions where the laser irradiated the flames was also studied. It was found that the enhancement of the diamond growth was due to the balance of the generation and the dispersion of the beneficial radicals.

Original languageEnglish (US)
Pages342-346
Number of pages5
DOIs
StatePublished - 2008
EventICALEO 2008 - 27th International Congress on Applications of Lasers and Electro-Optics - Temecula, CA, United States
Duration: Oct 20 2008Oct 23 2008

Conference

ConferenceICALEO 2008 - 27th International Congress on Applications of Lasers and Electro-Optics
CountryUnited States
CityTemecula, CA
Period10/20/0810/23/08

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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