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    12.
    发明专利
    未知

    公开(公告)号：DE68919328T2

    公开(公告)日：1995-05-24

    申请号：DE68919328

    申请日：1989-07-07

    Applicant: IBM

    Inventor： BRAREN BODIL E ,  SRINIVASAN RANGASWAMY

    IPC: A61B17/00 ,  A61B18/20 ,  A61B18/26 ,  A61C3/02 ,  A61N5/06 ,  B23K26/00 ,  B23K26/06 ,  B23K26/40 ,  H01L21/301 ,  H01L21/302 ,  H01S3/00 ,  A61B17/36

    Abstract: A method and apparatus are described which enhance the ablative effect of a UV laser (10). The ablative effect of a pulsed UV laser (10) is enhanced using a second, longer wavelength pulsed laser (20). Each pulse of the first laser (10) is followed by or combined with a pulse from the second laser (20). The etch depth per pulse is controlled by varying the time between pulses from the first (10) and second (20) lasers. The maximum etch depth per pulse occurs at a time separation which is a function of the substrate (50) being etched. The first laser (10) wavelength is selected to be within the absorption spectrum of the unexcited surface molecules of the substrate (50), while the wavelength of the second laser (20) is selected to be within the absorption spectrum of the surface molecules excited by the incident radiation of the first laser (10).

    16.
    发明专利
    未知

    公开(公告)号：DE2526456A1

    公开(公告)日：1976-03-25

    申请号：DE2526456

    申请日：1975-06-13

    Applicant: IBM

    Inventor： ANGADIYAVAR CHANNABASAPPA SANN ,  SRINIVASAN RANGASWAMY

    IPC: H01S3/20 ,  H01S3/213

    Abstract: New 2,4,6 trisubstituted pyridines are useful as laser dyes. These dyes are used in solution with a non-interfering solvent to form lasing media useful in dye lasers. When excited, these dyes have emission wavelengths which cover the spectrum from 410-570 nm. The violet and near ultra-violet regions of the visible spectrum are particularly well-served by the new compounds.

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