Figure 4:

Activation energy extracted from the current dynamic range ΔJ _d = (J _max − J _th) (green squares) and the laser’s maximum power output (P _max) (brown diamonds). The quantities in the y-axis are $\left(1-\frac{\mathrm{\Delta }{J}_{\mathrm{d}}\left(T\right)}{\mathrm{\Delta }{J_{\mathrm{d}}}_{\max }}\right)$ and $\left(1-\frac{P_{\text{out}}\left(T\right)}{{P_{\text{out}}}_{\max }}\right)$ respectively presented in logarithmic scale. An Arrhenius plot for $\left(1-\frac{P_{\text{out}}\left(T\right)}{{P_{\text{out}}}_{\max }}\right)$ is presented in the inset, this time as a function of the electron temperature T _e, including a characteristic excess temperature of ∼60 K, resulting in an activation barrier of ∼19 meV for the laser’s maximum power output (P _max) (brown diamonds) data, similarly to the current dynamic range ΔJ _d = (J _max − J _th) (green squares in main Figure) data with zero excess electron temperature.