标题: | 饱和吸收染料液滴雷射的共振腔量子电动力学稳态光谱研究 Studies on cavity-QED steady-state spectra of saturable absorbing liquid droplet dye lasers |
作者: | 游易儒 Yu, I-Ju 谢文峰 Wen-Feng Hsieh 光电工程学系 |
关键字: | 微米液滴;形依共振;品质因子;增强因子;microdroplet;MDR;quality factor;enhancement factor |
公开日期: | 1995 |
摘要: | 我们建立了一套微米大小之具饱和吸收的染料微滴雷射系统来观察其稳态 性质,根据共振腔量子电动力学的理论,该系统内由于共振模密度增大及模 间距的增加,自发辐射有增强的效应。而计算机模拟的结果显示,自发辐射 速率越大者,其激升临界值越低,在一个封闭的雷射腔中,激升临界值甚至 完全消失。实验结果也显示激升采 霋P辐射强度为正比的关系且无激升临 界值。另外,由于染料的低饱和吸收强度特性及其吸收截面与辐射截面重 叠的影响,此染料微滴雷射的共振光谱结构会随染料浓度的增高而往长波 长偏移,且共振频谱的谱宽分布甚广,并且在低染料浓度时,光谱谱线中出 现其它共振模阶的谱线结构,我们将理论模型的预测与实验的结果做比对, 得到与结果甚为吻合的解释。 We build up a micrometer diameter size saturable absorbing liquid droplet dye lasers in order to observe it' s steady-state properties. According to cavity-QED, the laser system has enhancement of spontaneous emission when the oscillation mode density and the mode distance increase. The simmulated results show that the larger spontaneous emission rate, the lower excitation threshold, which even completely disappear in a closed laser cavity. Experimental result also identify the linear proportion relation of the excitation and radition intensity, and the nearly disappearing excitation threshold. On the other hand,the structure of oscillationspectra of microdroplet dye lasers have the red shift when the concentration of dye increase, because of saturation absorption characteristics and the overlap between absorption and radiation crossection of dye in microdroplet cavity; besides,the range of oscillation spectra distributed widely,and the spectral lines appear other oscilases. We compare the experimental result with the prediction of theory, we find the nearly matched explanation. |
URI: | http://140.113.39.130/cdrfb3/record/nctu/#NT840124011 http://hdl.handle.net/11536/60139 |
显示于类别: | Thesis |