Tunable Second Harmonic Generation with High Conversion Efficiency in Periodically Poled Lithium Niobate Channel Waveguide

The experiment on quasi-phase-matched second harmonic generation (SHG) in a channel waveguide was reported. The waveguide was made by annealed proton exchange in the periodically poled lithium niobate (PPLN) with the period of PPLN of 14.9 μm, which was designed for cascading wavelength conversion in dense wavelength division multiplexer optical communications. The measurement results of SHG conversion efficiency as a function of fundamental wavelength at room temperature fit well to sinc~2 shape. The peak of SHG conversion efficiency was 75%·W~ -1 ·cm~ -2 as well as reported. The relationship between the center fundamental wavelength and temperature shows that SHG can be effectively tuned by the temperature in PPLN waveguide.     

ZnO薄膜PLD过程的机理及实验研究

讨论脉冲激光沉积原理,利用PLD在Si(001)衬底上生长ZnO薄膜,利用X射线衍射(XRD),原子力显微镜(AFM)等测试手段研究了不同衬底温度所生长的ZnO薄膜结构特征和性能。研究表明:衬底温度影响ZnO薄膜结构和性能。在500℃￣600℃沉积范围内随着温度升高,ZnO薄膜结构和性能提高。