Second-harmonic generation of blue light in GaN waveguidesRigler, Martin (Avtor) Troha, Tinkara (Avtor) Guo, Wei (Avtor) Kirste, Ronny (Avtor) Bryan, Isaac S. (Avtor) Collazo, Ramón (Avtor) Sitar, Zlatko (Avtor) Zgonik, Marko (Avtor) nonlinear opticsoptical waveguidessemiconductorsGaN waveguidessecond-harmonic generationmodal-dispersion phase matchingSecond-harmonic generation was studied in III-metal-polar GaN films grown on sapphire substrates by metalorganic chemical vapor deposition and formed into ridge waveguides. Broadband near-IR femtosecond pulses of an optical parametric amplifier system were injected by end-fire coupling and the nonlinear response was measured while tuning the central wavelength. A prominent peak was found at 450 nm for 1140 nm thick and 10 µm wide GaN waveguides. The measured second-harmonic peak was in agreement with the modal-dispersion phase matching condition calculated using the dispersion of the extraordinary refractive indices of GaN obtained by prism coupling.20182021-10-01 08:17:32Članek v reviji131677sl