title: AlGaAs guided-wave second-harmonic generation at 2.23  μm from a quantum cascade laser.
abstract: We demonstrate the frequency doubling of a quantum cascade laser in a multilayered, partially oxidized GaAs/AlOx waveguide. Using the waveguide width to fulfill the phase-matching condition, the second harmonic is generated in the wavelength range between 2.2 and 2.4 μm, where not many semiconductor sources are commercially available to date. We discuss the impact of a few fabrication and experimental parameters on the conversion efficiency, an essential step toward the improvement and practical implementation of this proof-of-principle semiconductor microsystem.
authors.forename: C
authors.initials: C
authors.lastname: Ozanam
authors.forename: M
authors.initials: M
authors.lastname: Savanier
authors.forename: A
authors.initials: A
authors.lastname: Lemaître
authors.forename: G
authors.initials: G
authors.lastname: Almuneau
authors.forename: M
authors.initials: M
authors.lastname: Carras
authors.forename: I
authors.initials: I
authors.lastname: Favero
authors.forename: S
authors.initials: S
authors.lastname: Ducci
authors.forename: G
authors.initials: G
authors.lastname: Leo