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    22.
    发明专利
    未知

    公开(公告)号：DE68919328D1

    公开(公告)日：1994-12-15

    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).

    25.
    发明专利
    未知

    公开(公告)号：FR2285734A1

    公开(公告)日：1976-04-16

    申请号：FR7515554

    申请日：1975-05-09

    Applicant: IBM

    Inventor： ANGADIYAVAR CHANNABASAPPA SANN ,  SRINIVASAN RANGASWAMY

    IPC: H01S3/20 ,  H01S3/213 ,  C09B57/00

    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.

    26.
    发明专利
    未知

    公开(公告)号：DE2236927A1

    公开(公告)日：1973-02-08

    申请号：DE2236927

    申请日：1972-07-27

    Applicant: IBM

    Inventor： LORENZ MAX RUDOLPH ,  SRINIVASAN RANGASWAMY

    IPC: B41M5/28 ,  G03C1/73 ,  G11B7/24

    Abstract: A thermochromic recording device is prepared from reversible photochromic materials. The photochromic material, dissolved in a plastic matrix, is coated onto a substrate. The coating is exposed to light radiation to produce a color therein. The colored layer or film can be rapidly written upon with low energy lasers or light emitting diodes to effect a visible image. Spots having 3 mu diameters can be recorded with energies as low as 0.043 nanojoules/ mu 2.

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