Title

Temperature-dependent absorptivity and cutting capability of CO2, Nd:YAG and chemical oxygen-iodine lasers

Authors

Authors

J. Xie; A. Kar; J. A. Rothenflue;W. P. Latham

Comments

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Abbreviated Journal Title

J. Laser Appl.

Keywords

absorptivity; temperature-dependent absorptivity; wavelength-dependent; absorptivity; laser cutting materials processing; YAG; CO2; chemical; oxygen-iodine laser; COIL; mathematical modeling; Materials Science, Multidisciplinary; Optics; Physics, Applied

Abstract

The most widely used high power industrial lasers are the Nd:YAG and CO2 lasers. The chemical oxygen iodine laser (COIL), whose wavelength (1.315 mu m) is between that of the Nd:YAG (1.06 mu m) and CO2 (10.6 mu m) lasers, is another high power laser for industrial applications. The cutting capability of these lasers is investigated in this paper. The cut depth strongly depends on the absorptivity of the cut material, kerf width and cutting speed. The absorptivity is an unknown parameter for which experimental data at high temperatures are currently unavailable. Theoretical values of the absorptivities of various metals are obtained using the Hagen-Ruben relationship. It is found that the absorptivity of a metal is linearly proportional to the square root of its resistivity and also inversely proportional to the square root of the wavelength. The absorptivities of the COIL and Nd:YAG lasers are 2.84 and 3.16 times larger than that of the CO2 laser, respectively. Based on these theoretical values of the absorptivity, the cut depths for several metals are analyzed at various laser powers and cutting speeds for these lasers. For identical cutting parameters, the cut depths for stainless steel and titanium are deeper than those of most other metals. Due to the wavelength dependence of the absorptivity, the cut depths for COIL and Nd:YAG lasers are expected to be 2.84 and 3.16 times deeper than that for the CO2 laser.

Journal Title

Journal of Laser Applications

Volume

9

Issue/Number

2

Publication Date

1-1-1997

Document Type

Article

Language

English

First Page

77

Last Page

85

WOS Identifier

WOS:A1997WT33500005

ISSN

1042-346X

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