Alpes Lasers Cascade Laser Starter Kit Datasheet download pdf (Page 4)

Chapter 1

Mechanical and geometrical

properties

QC lasers from Alpes Lasers SA are mounted on special carriers (NS or ST), which

require special handling and deﬁnition of geometrical orientation.

1.1 Geometry of QC lasers

1.1.1 How are the axes of the laser deﬁned, i.e. what is vertical?

The vertical direction is the so called growth direction.

In practice, you have a device in front of you, it is mounted on a copper carrier. The

carrier has one or two ceramic pads carrying the bonding wires. The pads are yellow

on top due to a layer of gold, and white around it and on the sides (colour of the ce-

ramic). If these pads are placed upwards, the vertical for the laser is the same as the

observer vertical direction.

If there are two ceramic pads present, they are named as follows: Looking onto the

front facet with the laser placed as described above, the pad left of the laser chip is

called ”down”, the one right of it ”up”. If no conﬁguration is speciﬁed, the ”down” pad is

used.

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Alpes Lasers Cascade Laser Starter Kit Datasheet Page 4