Nacionalni portal odprte znanosti

Second-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 nonli ...

As an alternative to electrically injected diodes, UV light emission can be obtained via second harmonic generation (SHG). In weakly birefringent materials such as aluminum nitride (AlN), the phase matching of the driving and second harmonic waves can be achieved by the quasi-phase-matching (QPM) te ...

Single crystals of GaN < 3 mm in length were grown by sublimation/recondensation of GaN in 760 Torr ▫$NH_3$▫ at 1100°C. Platelets of AlN < 1 mm thick were similarly grown between 1950 and 2250°C using an Al source. Monocrystalline GaN and ▫$Al_xGa_{1-x}N$▫(0001)(0.05 < x < 0.96) films were grown via ...