Self-pulsing 1050 nm quantum dot edge emitting laser diodes

We examine self-pulsing, edge emitting, quantum dot laser diodes as continuous broad spectrum light sources emitting at ∼1050 nm. Devices are configured with split contacts. When operated without a saturable absorber, the laser emits a number of discrete narrow modes, which merge to form a broad continuous lasing spectrum on application of the saturable absorber. The broadened spectra are consistent with the modulated carrier density expected under Q -switched operation. This provides a simple technique for generating emission suitable for biomedical applications. The spectral width achieved is ∼10 nm, and the average output power is 7.5 mW.