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Summary
The rational control of intrinsic defects in materials can significantly enhance their scientific and technological potentials, but it remains a long-standing challenge in nanocrystal-in-glass composites (NGCs). Herein, a defect engineering strategy mediated by the mixed alkali effect is proposed and experimentally demonstrated for NGCs. Interestingly, the hybridization of large alkali ions can effectively increase the barrier of Li+ migration and reduce the Li-related defects in LiNbO3 NGC. As a result, a novel LiNbO3 NGC with greatly reduced Li-related defects, high crystallinity of over 60%, and excellent optical transmission are successfully fabricated. This unique NGC configuration facilitates efficient transverse second harmonic generation (TSHG) in a broad wavelength region. Based on the above effects, a standard TSHG device is fabricated and implemented to monitor ultrashort optical pulses with duration in the order of approximate to 10-13 s over a broad wavelength region, down to 780 nm. The proposed strategy not only provides a new idea for defect engineering in materials science but also has great significance for boosting the practical applications of NGCs in ultrashort optical pulse monitoring. @@@ A novel defect engineering strategy mediated by the mixed alkali effect is proposed to regulate the intrinsic defects in nanocrystal-in-glass composites. A perfect LiNbO3 NGC with extremely low content of Li-related defects is successfully constructed. This unique NGC configuration facilitates the monitoring of ultrashort optical pulse in the time scale of approximate to 10-13 s over a wide wavelength region.image
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Institution广州大学; 浙江大学
