In this paper we investigate and compare a laser-driven joining process with two different illumination conditions: (i) high speed scanning of a focused beam and (ii) reasonably uniform "flood illumination" of the whole sample. It is shown that the scanning beam not only avoids illuminating the central part of the device, but also provides more uniform heating of the area to be bonded than laser "flood illumination". We demonstrate bonding of three different packages: (i) LCC (Leadless chip carrier) packages, (ii) AIN and (iii) LTCC (Low temperature co-fired ceramic) substrates to "top-hat" packages, using a scanned beam from a fibre-delivered high power laser diode array to cure an intermediate layer of glass frit. Standard leak testing demonstrates that all those samples have excellent hermetic sealing with leak rates at the level of 10-9 atm·cc/s. ©2008 IEEE.
|Title of host publication||Proceedings - 2008 2nd Electronics Systemintegration Technology Conference, ESTC|
|Number of pages||9|
|Publication status||Published - 2008|
|Event||2008 2nd Electronics Systemintegration Technology Conference - Greenwich, United Kingdom|
Duration: 1 Sept 2008 → 4 Sept 2008
|Conference||2008 2nd Electronics Systemintegration Technology Conference|
|Period||1/09/08 → 4/09/08|