The Pure Photonics tunable lasers should be installed upon some heatsink. As the operating power of the laser is in the range of 3.5W at max power and closer to 1.5-2W at room temperature, simple heatsink solutions (including PCB mounting with thermal vias) are acceptable. It is the user responsibility to ensure the ambient temperature complies with the device specifications. 

For the device temperature reading, the thermistor is placed on the PCB next to the laser, not at the laser cavity (in the goldbox). So a temperature controlled heatsink with an airflow, will give a different result than putting the device in an immersive environment.

The device can be mounted upright, with a flex cable connecting the device to surrounding circuit. The device can also be installed upside down, plugged directly into an on-PCB connector. Care needs to be taken with stress relief (especially for the PPCL700).

The PPCL700 is designed to have the PCB free-hanging. So any screws should not go through the PCB and rather only go through the bottom baseplate.