Active/passive integrated photonic crystal slab μ-laser

Using MOCVD butt-joint regrowth technique, we fabricated a μ-laser monolithically integrated with a passive waveguide in GaInAsP photonic crystal slab, for the first time. We observed the lasing operation and light extraction from the waveguide with an external quantum efficiency of 8%/facet. It will be the key technology for advanced photonic integration based on photonic crystal slab.