Patent ID: 6300590
Filing Date: 2001-10-09
Classification: B23K,H01L

Abstract:
A method of vaporizing a target structure on a substrate, comprising the steps of:calculating, as a function of wavelength, an incident beam energy necessary to deposit unit energy in the target structure sufficient to vaporize the target structure;calculating, for the incident beam energy, energy expected to be deposited in the substrate as a function of wavelength;identifying a wavelength below an absorption edge of the substrate, the wavelength corresponding to a relatively low value of the energy expected to be deposited in the substrate, the low value being substantially less than a value of the energy expected to be deposited in the substrate at a higher wavelength below the absorption edge of the substrate;providing a laser system configured to produce a laser output at the wavelength corresponding to the relatively low value of the energy expected to be deposited in the substrate; anddirecting the laser output at the target structure on the substrate at the wavelength corresponding to the relatively low value of the energy expected to be deposited in the substrate and at the incident beam energy, in order to vaporize the target structure, the substrate being positioned beneath the target structure with respect to the laser output.