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This article describes a laser microweld technique which utilizes lenses to couple laser light from fiber into the bonder tip to prevent damaging the fiber and tip.
English (United States)
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Improved Laser Microweld Technique
This article describes a laser microweld technique which utilizes lenses to
couple laser light from fiber into the bonder tip to prevent damaging the fiber and
It has been shown that engineering change (EC) wire bonds can be made on
multilayer ceramic substrates with a neodymium: yttrium aluminum garnet
(Nd:Yag) laser. An optical fiber transmits laser light into a hollow conical
tungsten carbide tip, which holds down the wire onto the EC pad. When laser
energy is applied, the gold-plated copper wire melts and forms a bond with the
pad under pressure. However, this simple fiber-in-tip set up has frequently
burned the fiber and plugged the tip. In the technique disclosed herein light is
coupled from the fiber into tip by means of lenses, which are far away from the tip
end and, therefore, less likely to cause damage. Further, light can be focused
tightly onto the tip end, resulting in efficient use of the laser energy.