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Reduction of Particulates in Laser Ablated High Tc Thin Films by Laser-Induced Plume Heating

IP.com Disclosure Number: IPCOM000103525D
Original Publication Date: 1990-Dec-01
Included in the Prior Art Database: 2005-Mar-18
Document File: 1 page(s) / 42K

Publishing Venue

IBM

Related People

Baseman, RJ: AUTHOR [+4]

Abstract

Disclosed is a technique for reducing the number and size of particulates deposited on a high Tc superconducting film fabricated by the laser ablation deposition technique by employing a second laser pulse to heat the plume formed by the initial ablating laser pulse.

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Reduction of Particulates in Laser Ablated High Tc Thin Films by Laser-Induced Plume Heating

      Disclosed is a technique for reducing the number and size of
particulates deposited on a high Tc superconducting film fabricated
by the laser ablation deposition technique by employing a second
laser pulse to heat the plume formed by the initial ablating laser
pulse.

      As shown in the figure, if the wavelength, pulse duration,
fluence and time delay of the second (plume heating) pulse are chosen
appropriately, electrons, ions, molecules, radicals, and larger
fragments formed by the first laser pulse may readily absorb the
second laser pulse, thereby effectively heating the plume.

      Heating the plume reduces the number and size of particulates
deposited on the substrates by fragmenting particulates ablated from
pellet and/or by interrupting growth of particulates in the high
density portion of the plume.

      Disclosed anonymously.