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Copyright © 2002, MCB UP Limited
Low temp glass-to-metal preform seals for optic fibres
Good news for laser diode packaging which comes from Production Equipment Sales Ltd (PESL) in the shape of the DIEMAT range of glass preforms for use in hermetically sealing glass to metal. (see Plate 4).
Plate 4 The DIEMAT process
The DIEMAT process features a preformed glass collet, which fits over the optic fibre. The preform (with fibre) is then induction heated in a metal head, (generally to just over 350°C) this flows the collet into the header while maintaining central alignment of the fibre and provides a hermetic glass to metal seal in the laser package.
This process replaces solder and associated need for fibre metalisation, it is fatigue and corrosion resistant without creepage. The no-flux process takes less than 10sec, has high adhesion and proven reliability associated with low thermal stresses. Preforms are available in a variety of sizes ranging from 0.01000 ID, donuts to large forms up to 100 or larger of various shapes.