GaAs-based quantum-cascade laser diodes

In this contribution, we discuss our recent results on GaAs-based quantum cascade lasers. In general, we strive to achieve high-power room temperature operation. The best performance in GaAs-based Fabry-Perot quantum cascade laser diodes (pulsed operation) show peak powers of more than 3W at liquid nitrogen temperatures and more than 300 mW at room temperature at an emission wavelength of 9 microns. Lasing up to 100°C lattice temperature was detected. Single mode emitting distributed feedback lasers show more than 80mW optical peak power at room temperature. Furthermore, to explore the spectral behavior of the lasers, we processed cavities of different geometries, that is, disk- and ring-shaped cavities.