Fig. 4
From: Sample Grating Distributed Feedback Quantum Cascade Laser Array
(a) The emission frequency of the no. 2 laser in the array as functions of the injected electrical power (scattering dots) and fitting results (straight lines) which give the parameter R th, including the thermal resistance and the tuning coefficient β. b, c Heat dissipation simulation results of epitaxial side down and up ridges. The injected powers keep at 4.25 W, and the heat sink temperatures keep at 300 K