Laser pulse focused with spherical and cylindrical optical systems in laser treatment of the surface layer of metals

Ryszard Pawlak

doi:10.1117/12.203231

1 March 1995 Laser pulse focused with spherical and cylindrical optical systems in laser treatment of the surface layer of metals

Ryszard Pawlak

Author Affiliations +

Proceedings Volume 2202, Laser Technology IV: Research Trends, Instrumentation, and Applications in Metrology and Materials Processing; (1995) https://doi.org/10.1117/12.203231
Event: Laser Technology: Fourth Symposium, 1993, Szczecin, Poland

Abstract

The use of pulsed laser (e.g., Nd-YAG) in the treatment of the surface layer of metals requires focusing radiation to achieve a desirable value of the surface power density. In the paper a comparison of the laser surface treatment of different metals using radiation pulses focused by means of a spherical and cylindrical optical system has been presented. Different conditions of the technological process and effects obtained in both cases have been analyzed. Objectives containing spherical lenses are in common use, which ensures circular symmetry and exact mapping of the distribution of power density in the beam focused on the surface under treatment. This symmetry also simplifies the analysis of temperature fields caused by energy pulse absorbed. In this case, the boundary surface of the fused zone has approximately a spherical shape. The fusion area structure shows a radial symmetry corresponding to the temperature distribution during solidification. Shaping a beam by means of cylindrical lenses of different focal lengths causes the beam to have a shape in the focus that can be approximated with an ellipse or a rectangle. The surface distribution of power density results in diversified conditions of melting. The shape of boundary surface of the fused zone and the structure orientation in the fused area change. In some cases this manner of focusing a laser beam provides better conditions for obtaining a modified surface layer of the metal.

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Ryszard Pawlak "Laser pulse focused with spherical and cylindrical optical systems in laser treatment of the surface layer of metals", Proc. SPIE 2202, Laser Technology IV: Research Trends, Instrumentation, and Applications in Metrology and Materials Processing, (1 March 1995); https://doi.org/10.1117/12.203231

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KEYWORDS

Spherical lenses

Metals

Beam shaping

Pulsed laser operation

Laser therapeutics

Nd:YAG lasers

Objectives

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