Ablation with femtosecond pulses: The effect of temporal contrast

J. Bohus, T. Csákó, T. Szörényi, S. Szatmári

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

An inherent property of the ultrashort pulse lasers used presently for materials processing is that the main pulse is accompanied by an amplified spontaneous emission background. The temporal quality of the pulses is characterized by the temporal contrast. Due to the 5-6 orders of magnitude difference in the duration of the main pulse and the pedestal, high intensity contrast does not mean necessarily high enough difference in the respective energies. In materials processing applications consideration of the energy contrast is advisable. The importance of the contrast in determining the ablation process is exemplified by the dependence of the ablation rate of boron carbide on the cleanness of the pulses of a high brightness hybrid dye/excimer laser system. It is shown that serious consideration of the effects of the nanosecond background is mandatory when evaluating the results.

Original languageEnglish
Pages (from-to)7779-7782
Number of pages4
JournalApplied Surface Science
Volume253
Issue number19
DOIs
Publication statusPublished - Jul 31 2007

Fingerprint

Ablation
Ultrashort pulses
ablation
Ultrafast lasers
Boron carbide
Dye lasers
Spontaneous emission
Excimer lasers
Processing
pulses
Luminance
Laser pulses
boron carbides
dye lasers
excimer lasers
spontaneous emission
brightness
energy
lasers

Keywords

  • Ablation yield
  • Energy contrast
  • Intensity contrast
  • PLA
  • PLD
  • Ultrashort pulse processing

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Condensed Matter Physics

Cite this

Ablation with femtosecond pulses : The effect of temporal contrast. / Bohus, J.; Csákó, T.; Szörényi, T.; Szatmári, S.

In: Applied Surface Science, Vol. 253, No. 19, 31.07.2007, p. 7779-7782.

Research output: Contribution to journalArticle

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