Blanchard, R.Menzel, S.Pflügl, C.Diehl, L.Wang, C.Huang, Y.Ryou, J-H.Dupuis, R. D.Dal Negro, L.Capasso, F.2019-09-172011Blanchard, R, S Menzel, C Pflügl, L Diehl, C Wang, Y Huang, J-H Ryou, R D Dupuis, L Dal Negro, and F Capasso. 2011. “Gratings with an Aperiodic Basis: Single-Mode Emission in Multi-Wavelength Lasers.” New Journal of Physics 13 (11): 113023. https://doi.org/10.1088/1367-2630/13/11/113023.1367-2630http://nrs.harvard.edu/urn-3:HUL.InstRepos:41371555We propose a new class of gratings having multiple spatial frequencies. Their design relies on the use of small aperiodic grating sequences as unit cells whose repetition forms a superlattice. The superlattice provides well-defined Fourier components, while the choice of the unit cell structure enables the selection, modulation or suppression of certain Fourier components. Using these gratings to provide distributed feedback in mid-infrared quantum cascade lasers, we demonstrate simultaneous lasing on multiple well-defined and isolated longitudinal modes, each one having a sidemode suppression ratio of about 20 dB.en-USJournal Article2019-09-1710.1088/1367-2630/13/11/113023