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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 22 — Oct. 24, 2011
  • pp: 21842–21848

Reflection of nanosecond Nd:YAG laser pulses in ablation of metals

O. Benavides, O. Lebedeva, and V. Golikov  »View Author Affiliations


Optics Express, Vol. 19, Issue 22, pp. 21842-21848 (2011)
http://dx.doi.org/10.1364/OE.19.021842


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Abstract

Hemispherical total reflectivity of copper, nickel, and tungsten in ablation by nanosecond Nd:YAG laser pulses in air of atmospheric pressure is experimentally studied as a function of laser fluence in the range of 0.1–100 J/cm2. Our experiment shows that at laser fluences below the plasma formation threshold the reflectivity of mechanically polished metals remains virtually equal to the table room-temperature reflectivity values. The hemispherical total reflectivity of the studied metals begins to drop at a laser fluence of the plasma formation threshold. With increasing laser fluence above the plasma formation threshold the reflectivity sharply decreases to a low value and then remains unchanged with further increasing laser fluence. Computation of the surface temperature at the plasma formation threshold fluence reveals that its value is substantially below the melting point that indicates an important role of the surface nanostructural defects in the plasma formation on a real sample due to their enhanced heating caused by both plasmonic absorption and plasmonic nanofocusing.

© 2011 OSA

OCIS Codes
(120.5700) Instrumentation, measurement, and metrology : Reflection
(140.3390) Lasers and laser optics : Laser materials processing
(160.0160) Materials : Materials
(160.3900) Materials : Metals
(240.0240) Optics at surfaces : Optics at surfaces

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: August 31, 2011
Manuscript Accepted: September 20, 2011
Published: October 20, 2011

Citation
O. Benavides, O. Lebedeva, and V. Golikov, "Reflection of nanosecond Nd:YAG laser pulses in ablation of metals," Opt. Express 19, 21842-21848 (2011)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-22-21842


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