Optical Net Gain Measurement on Al0.07Ga0.93N/GaN Multi-Quantum Well

See shorturl.at/vAK28 — We present net gain measurements at room temperature in l0.07Ga0.93N/GaN 10-period multi-quantum well emitting at 367 nm, using the variable stripe length method. Measurements were conducted at two different positions on the sample, where the net gain threshold was attained at 218 kW.cm-2 and 403 kW.cm-2. At the position with higher threshold, we observed an anomalous amplification of the photoluminescence intensity that occurs for long stripe lengths (superior to 400 µm) and high pumping power (superior to 550 kW.cm-2), leading to an overestimation of the gain value. We attribute such a phenomenon to the feedback provided…