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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 11 — Jun. 3, 2013
  • pp: 13068–13074

A comparative study on reflection of nanosecond Nd-YAG laser pulses in ablation of metals in air and in vacuum

O. Benavides, L. de la Cruz May, and A. Flores Gil  »View Author Affiliations


Optics Express, Vol. 21, Issue 11, pp. 13068-13074 (2013)
http://dx.doi.org/10.1364/OE.21.013068


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Abstract

A comparative study on reflection of nanosecond Nd-YAG laser pulses in ablation of aluminum in air and in vacuum under the same other experimental conditions is performed. We find that, hemispherical total reflectivity of aluminum undergoes a sharp drop at the plasma formation threshold both in the air and in vacuum. The initial large value (0.8) of aluminum reflectivity decreases to a level of about 0.14 and 0.24 for ablation in the air and in vacuum, respectively. These decreased reflectivity values remain virtually unchanged with further increasing laser fluence. The reflectivity drop in the air is observed to be sharper than in vacuum. Our study indicates that the reflectivity drop is predominantly caused by absorption of the laser light in plasma. Nano/micro-structural defects present on practical sample surfaces play the important role in the plasma formation, especially for the ablation in the air, where the plasma formation threshold is found to be by a factor of 3 smaller than in vacuum.

© 2013 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:
Materials

History
Original Manuscript: April 15, 2013
Revised Manuscript: May 13, 2013
Manuscript Accepted: May 13, 2013
Published: May 20, 2013

Citation
O. Benavides, L. de la Cruz May, and A. Flores Gil, "A comparative study on reflection of nanosecond Nd-YAG laser pulses in ablation of metals in air and in vacuum," Opt. Express 21, 13068-13074 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-11-13068


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