S-Chromophores showed larger DFT calculation μβ and red-shifted λmax which indicated more effective intermolecular charge transfer.

We report high-power efficient green light generation by frequency doubling from a periodically poled MgO doped LiNbO(3) ridge waveguide. The ridge waveguide is fabricated by the annealed proton-exchanging and precise diamond blade dicing techniques. The ridge structure exhibits a surface roughness of only 3.7 nm, and near-90° vertical sidewall. The total insertion loss of an 8.5 µm wide and 1.4 cm long uncoated waveguide is 3.0 dB under direct fiber coupling. 466 mW of continuous-wave green light with an optical-to-optical conversion efficiency of 69.7% is obtained. To the best of our knowledge, this is the highest green light output power reached to date using a ridge-type LiNbO(3) waveguide device. Phase-matching temperature shift, tuning curve distortion, and waveguide loss increase are observed under high power operation. Our analysis shows that the photorefractive effect and the green induced infrared absorption are responsible for the observed phenomena, which becomes prominent under several megawatt per square centimeter power density.

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ABSTRACT:The influence of the compounding route of polypropylene (PP)/ethylene-propylene-diene terpolymer (EPDM)/nano-CaCO 3 composites on their properties, including their mechanical properties, the dispersion degree of nano-CaCO 3 , and the morphology of EPDM, was studied. The results showed that the toughness of the composites and the morphology of the EPDM particles were markedly influenced by the compounding route, whereas the dispersion degree of nano-CaCO 3 in the matrix was little influenced by the compounding route. The impact strength of composites prepared by one route was about 60 kJ/m 2 with 20 wt % nano-CaCO 3 . The results indicated that a sandbag of nanoCaCO 3 embedded in EPDM could effectively improve the toughness of the composites. A sandbag composed of EPDM and nano-CaCO 3 eliminated the deterioration effect of the nano-CaCO 3 agglomerate on the toughness of the composites, whereas the nano-CaCO 3 agglomerate separately dispersed in PP decreased the toughness of the tercomponent composite