Schwarz, Ulrich and Sturm, Evi and Wegscheider, Werner and Kümmler, V. and Lell, Alfred and Härle, Volker
Gain spectra and current-induced change of refractice index in (In/Al)GaN diode lasers.
physica status solidi a 200 (1), pp. 143-146.
Adapting the Hakki-Paoli method for blue laser diodes we measure gain spectra for (In/Al)GaN on SiC substrate laser diodes in the low carrier density regime. From the measured longitudinal mode spacing we calculate the effective refractive index and can exclude a mode spacing anomaly. We demonstrate that the substrate has a considerable influence on the modal gain.