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利用飞秒脉冲激光激发,研究了均匀沉淀法制备获得的 ZnO 纳米多晶颗粒的室温紫外受激发射。在高密度激发功率下,其发射光谱表现为宽的发射背景上一系列的锐窄结构,且两相邻尖锐峰间距基本相同,即激射模式具有等间距性质。改变激光激发强度,发射谱带红移,但激射模式间距不随激发强度变化而变化:进一步比较三组典型粒径的 ZnO 纳米多晶颗粒样品发射光谱的激射模式,发现模式间距也相同,即激射模式间距与粒径也没有关系,不同于传统的谐振腔理论。
The femtosecond pulsed laser excitation was used to study the room-temperature ultraviolet (UV) stimulated emission of ZnO nanoparticles prepared by homogeneous precipitation. Under high-density excitation power, the emission spectra show a series of sharp and narrow structures on a broad emission background, and the spacing between two adjacent sharp peaks is basically the same, that is, the lasing mode has the same-spacing property. The laser excitation intensity was changed and the emission band was redshifted, but the lasing mode spacing did not change with the excitation intensity. The lasing modes of the ZnO nanocrystals with three typical particle sizes were further compared, and the mode spacing was also found to be the same. That lasing mode spacing and particle size also has nothing to do with the traditional cavity theory.