Alpes Lasers Cascade Laser Starter Kit Datasheet download pdf (Page 7)

CHAPTER 1. MECHANICAL AND GEOMETRICAL PROPERTIES 6

As the QCL chip itself is soldered, and the contact pads on the ceramics are made

of Gold, it is not possible to use normal Lead-Tin solder (temperature too high, and

solder will destroy Gold contacts by forming alloy). Alpes Lasers SA recommends use

of pure Indium for soldering, in the form of paste of microscopic beads in ﬂux.

It is of highest importance to never touch any part of the laser chip itself (especially

not the facets) nor the bonds, as this may result in fatal damage to the QCL. Solder with

a very ﬁne tip solder iron at about 170C, only at the corner of the contact pad which is

most distant from the bonds and the chip, and only very thin and ﬂexible wires.

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Alpes Lasers Cascade Laser Starter Kit Datasheet Page 7