In our paper, we will present a further development of our red-emitting distributed Bragg reflector ridge waveguide laser (DBR-RWL). DBR surface gratings are implemented into the 2 mm long RWL by BCl3-Ar reactive ion etching. This fabrication process uses a single-epitaxy and is hence industry-compatible.
At a heat sink temperature of 15°C the DBR-RWL provides 120 mW of optical output power in longitudinal single mode emission. Heterodyne linewidth measurements of two identical DBR-RWL show a FWHM linewidth of less than 2 MHz. The excellent beam quality (M2 = 1.1) enables the use of these chips for play-back of holographic films or as master oscillators in a future micro-integrated master oscillator power amplifier configuration for recording.