摘要
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。
Stimulated emission from nanosized polycrystalline ZnO is observed under femtosecond excitation.At high excitation level,sharp lasing peaks with full wavelength at half maximum(FWHM)less than 0.5 nm emerged rapidly from the broad emission spectra and the emission lines are almost equally spaced in energy.With the excitation intensity further increasing,a clear redshift was observed for the peak position,while no change happened for the wavelength interval.By comparing the results of different diameters,we find that there is no relation between the mode space and the particle size,which is obviously different from the classical cavities.
出处
《红外与激光工程》
EI
CSCD
北大核心
2006年第z3期22-26,共5页
Infrared and Laser Engineering
基金
国家自然科学基金(10574165)
关键词
ZnO纳米多晶
受激辐射
激射模式
模式间距
Nanosized polycrystalline ZnO
Stimulated emission
Lasing mode
Mode space
