Datasheet

Chapter 4: QCL Operation
4.4.1. Maximum operating current
All QCLs have a maximum operating current above which a Negative Differential Re-
sistance (NDR) appears and may destroy the laser. As an example, figure 4.5 shows
the IV curve and emitted power of a DFB QCL operated in pulsed mode: the green
squares indicate the maximum current for monomode operation, 4.7 A from -30 to
30
◦
C in the present case.
CAUTION:
The maximum operating current of each ALPES LASERS QCL is
indicated in the IV and emitted power plots caption of the datasheet.
Do not operate the laser with a current above those values;
permanent damage may result.
Figure 4.5.: IV curves of a DFB QCL operated in pulsed mode at different
temperatures.
50 QCL user’s manual v3.0