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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 15 — Jul. 28, 2014
  • pp: 18790–18799

Effect of pulse to pulse interactions on ultra-short pulse laser drilling of steel with repetition rates up to 10 MHz

Johannes Finger and Martin Reininghaus  »View Author Affiliations


Optics Express, Vol. 22, Issue 15, pp. 18790-18799 (2014)
http://dx.doi.org/10.1364/OE.22.018790


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Abstract

We report on the effect of pulse to pulse interactions during percussion drilling of steel using high power ps-laser radiation with repetition rates of up to 10 MHz and high average powers up to 80 W. The ablation rate per pulse is measured as a function of the pulse repetition rate for four fluences ranging from 500 mJ/cm2 up to 1500 mJ/cm2. For every investigated fluence an abrupt increase of the ablation rate per pulse is observed at a distinctive repetition rate. The onset repetition rate for this effect is strongly dependent on the applied pulse fluence. The origin of the increase of the ablation rate is attributed to the emergence of a melt based ablation processes, as Laser Scanning Microscopy (LSM) images show the occurrence of melt ejected material surrounding the drilling holes. A semi empirical model based on classical heat conduction including heat accumulation as well as pulse-particle interactions is applied to enable quantitative conclusions on the origin of the observed data. In agreement with previous studies, the acquired data confirm the relevance of these two effects for the fundamental description of materials processing with ultra-short pulsed laser radiation at high repetition rates and high average power.

© 2014 Optical Society of America

OCIS Codes
(140.3390) Lasers and laser optics : Laser materials processing
(320.7090) Ultrafast optics : Ultrafast lasers

ToC Category:
Laser Microfabrication

History
Original Manuscript: April 24, 2014
Revised Manuscript: June 19, 2014
Manuscript Accepted: June 26, 2014
Published: July 25, 2014

Citation
Johannes Finger and Martin Reininghaus, "Effect of pulse to pulse interactions on ultra-short pulse laser drilling of steel with repetition rates up to 10 MHz," Opt. Express 22, 18790-18799 (2014)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-22-15-18790


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