1.1 ALPES LASERS products
shown in figure 1.2. The ceramic pads surface is covered with a gold layer, and their
sides have a whitish ceramic color; the golden surface must be positioned upwards.
When looking into the LLH from the top, the pad left of the direction of emission is
called DN for down, and the right pad UP for up. Only one pad is characterized, as
specified in the datasheet. If only one pad is present, it is in the DN position by default.
Polarity
By default, the laser has negative polarity: the cathode is connected to the ceramic
pads and the anode is connected to the submount copper plate (see figure 1.2). The
laser may be mounted junction down; this is clearly indicated on the laser box. In
this case, the laser has positive polarity: the cathode is connected to the submount
copper plate and the anode to the ceramic pads.
1.1.3. QCL mounting
ALPES LASERS QCLs can be mounted on two types of submounts:
• ST: clamped mounting
• NS: screwed mounting
The QCL submount can be integrated in a LLH, HHL or in any package designed by
the customer. The QCL submount is itself mounted on a copper plate, which lies on
a Peltier junction for heat dissipation, as shown in figure 1.2.
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Figure 1.2.: ALPES LASERS QCL NS submount mounted in a HHL or LLH housing.
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2014 SA 3
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