Laser diodes generate heat in the process of emitting light. Typically, 10-30% of the power used to generate heat is converted to light, the rest is wasted as heat. This heat ends up warming the laser diode, the module, the optics and surrounding housing. We can manage the heat through a thermal pathway which allows the heat to flow away from the laser diode.  Read more about how we ensure efficient thermal management in our laser modules here.