Datasheet

Chapter 7: Maintenance
Figure 7.6.: Laser exchange procedure: removing the contact set (left), securing the
laser submount (right).
CAUTION:
Do not drop the screws onto the submount. This may result in
permanent damage to the laser.
6. secure the laser submount into the LLH with the two dedicated screws; use
tweezers to hold the screw in place while screwing with an allen key
7. put the contact set on top of the laser submount into the LLH housing:
a) use the middle knob to hold the contact set
b) position the two rear holes above the pins for proper alignment
c) tighten the two dedicated screws through the front holes
d) press slightly for good electrical contact
8. use a multimeter to measure the resistance between the base and the laser
connectors. It should lie between 30 Ω and 300 kΩ; no resistance indicates
a shortcut, infinite resistance indicates a misconnection
2
. In those two cases,
perform step 7 until a good contact is obtained.
9. close the LLH cover
2
The laser’s resistance is measured between the submount copper base and the ceramic pad. The
resistance between the base and the laser connectors on the LLH should be the same as the
laser’s resistance (±2Ω).
80 QCL user’s manual v3.0