Electrically pumped photonic crystal distributed feedback quantum cascade lasers - art. no. 6900OA

We demonstrate electrically pumped, room temperature, single mode operation of photonic crystal distributed feedback (PCDFB) quantum cascade lasers emitting at lambda similar to 4.75 mu m. Ridge waveguides of 50 mu m and 100 mu m width were fabricated with both PCDFB and Fabry-Perot feedback mechanisms. The Fabry-Perot device has a broad emitting spectrum and a broad far-field character. The PCDFB devices have primarily a single spectral mode and a diffraction limited far field characteristic with a full angular width at half-maximum of 4.8 degrees and 2.4 degrees for the 50 mu m and 100 mu m ridge widths, respectively.