Near-terahertz passive harmonic modelocking in monolithic compound-cavity laser diodes

We report modelocking rates of up to 620 GHz from what is, to our knowledge, the first purpose fabricated monolithic compound cavity mode locked (CCM) laser diodes at 0.86 /spl mu/m. The experiments here were performed with 3-section GaAs-AlGaAs double quantum-well ridge-waveguide laser diodes, incorporating a saturable absorber and two gain sections, with an etched reflector between them.