Temperature of the active region can be calculated from the following equation:

Blue-violet nitride laser diode operate ot relatively high current density of the range of 5-10 kA/cm2. The degradation of these diodes occurs predominantly by the increase of their threshold current. There are two the most important factors influencing the degradation speed:
1.Operation current (degradation rate is proportional to degradation current)
2.Operation and junction temperature (very fast, exponential dependence)
3.The degradation rate can be calculated form the following equation:
Where:
A – constant
I – operating current
EA – activation energy of degradation (typically 0,35 to 0.4 eV)
k – Boltzman constant
THS – temperature of the heat sink
RT – thermal resistance (for TO56 package, THS=25-30 K/W)
U – operating voltage
Temperature of the active region can be calculated from the following equation:
Typical dependence of degradation rate on temperature for a fixed currents.
1.Installing your diode, always use antistatic wrist band,
2.Operate your diode at lowest possible temperature (use good heatsinks),
3.Avoid higher operating currents than allowed by the technical specification.