Investigation into the absorptivity change in metals with increased laser power

Kristian Blidegn, Flemmming Ove Olsen

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

    Abstract

    At a first glance the low absorptivity of metals in the infrared (IR) makes the use of YAG and CO2 lasers in metal processing very inefficient. However industrial inert gas cutting abilities demonstrates that the absorptivity can reach significantly higher levels during the high power laser interaction. An increase which can not be explained by the increase in temperature only. The interaction between laser light and metals is a major physical phenomena in laser material processing. The Drude free electron model or simplifications like the Hagen-Rubens relation has often been used to model the processes.This paper discuss the need to extend the Drude mode taking into account interband transitions and anormal skin effect in order to describe in increase in absorptivity seen at high intensities. The absorption model will be used in a cut front simulation and results are compared with cutting abilities from the Danish industry.
    Original languageEnglish
    Title of host publicationProceedings 6th Nolamp Conference
    Place of PublicationLuleå
    PublisherLuleå University
    Publication date1996
    Pages32-38
    Publication statusPublished - 1996
    Event6th Nordic Laser Material Processing Conference - Luleå, Sweden
    Duration: 27 Aug 199729 Aug 1997
    Conference number: 6

    Conference

    Conference6th Nordic Laser Material Processing Conference
    Number6
    CountrySweden
    CityLuleå
    Period27/08/199729/08/1997

    Cite this

    Blidegn, K., & Olsen, F. O. (1996). Investigation into the absorptivity change in metals with increased laser power. In Proceedings 6th Nolamp Conference (pp. 32-38). Luleå: Luleå University.
    Blidegn, Kristian ; Olsen, Flemmming Ove. / Investigation into the absorptivity change in metals with increased laser power. Proceedings 6th Nolamp Conference. Luleå : Luleå University, 1996. pp. 32-38
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    title = "Investigation into the absorptivity change in metals with increased laser power",
    abstract = "At a first glance the low absorptivity of metals in the infrared (IR) makes the use of YAG and CO2 lasers in metal processing very inefficient. However industrial inert gas cutting abilities demonstrates that the absorptivity can reach significantly higher levels during the high power laser interaction. An increase which can not be explained by the increase in temperature only. The interaction between laser light and metals is a major physical phenomena in laser material processing. The Drude free electron model or simplifications like the Hagen-Rubens relation has often been used to model the processes.This paper discuss the need to extend the Drude mode taking into account interband transitions and anormal skin effect in order to describe in increase in absorptivity seen at high intensities. The absorption model will be used in a cut front simulation and results are compared with cutting abilities from the Danish industry.",
    author = "Kristian Blidegn and Olsen, {Flemmming Ove}",
    year = "1996",
    language = "English",
    pages = "32--38",
    booktitle = "Proceedings 6th Nolamp Conference",
    publisher = "Lule{\aa} University",

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    Blidegn, K & Olsen, FO 1996, Investigation into the absorptivity change in metals with increased laser power. in Proceedings 6th Nolamp Conference. Luleå University, Luleå, pp. 32-38, 6th Nordic Laser Material Processing Conference, Luleå, Sweden, 27/08/1997.

    Investigation into the absorptivity change in metals with increased laser power. / Blidegn, Kristian; Olsen, Flemmming Ove.

    Proceedings 6th Nolamp Conference. Luleå : Luleå University, 1996. p. 32-38.

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

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    AU - Olsen, Flemmming Ove

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    AB - At a first glance the low absorptivity of metals in the infrared (IR) makes the use of YAG and CO2 lasers in metal processing very inefficient. However industrial inert gas cutting abilities demonstrates that the absorptivity can reach significantly higher levels during the high power laser interaction. An increase which can not be explained by the increase in temperature only. The interaction between laser light and metals is a major physical phenomena in laser material processing. The Drude free electron model or simplifications like the Hagen-Rubens relation has often been used to model the processes.This paper discuss the need to extend the Drude mode taking into account interband transitions and anormal skin effect in order to describe in increase in absorptivity seen at high intensities. The absorption model will be used in a cut front simulation and results are compared with cutting abilities from the Danish industry.

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    Blidegn K, Olsen FO. Investigation into the absorptivity change in metals with increased laser power. In Proceedings 6th Nolamp Conference. Luleå: Luleå University. 1996. p. 32-38