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

    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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