蓝宝石中振动模式相干耦合的量子拍频研究  

Quantum beats of coherent coupling between vibrational modes in sapphire

作　　者：杜鑫[1] Du Xin(College of Foundation Science, Harbin University of Commerce, Harbin 150028, China)

机构地区：[1]哈尔滨商业大学基础科学学院,哈尔滨150028

出　　处：《黑龙江科技大学学报》2016年第5期586-590,共5页Journal of Heilongjiang University of Science And Technology

基　　金：黑龙江省教育厅科学技术研究项目(12541206)

摘　　要：研究飞秒时间分辨相干反斯托克斯拉曼散射(CARS)技术意义重大。采用该技术对蓝宝石晶体中377、416、430和449 cm^(-1)四个振动模式同时激发,在这些模式的振动弛豫过程中,可见相干耦合的量子拍频现象,并给出量子拍频信号的傅里叶变换。实验以宽谱带的超连续白光为斯托克斯光,利用超连续白光的啁啾效应,可以省去复杂的激光系统。该研究可以帮助深入理解量子相干知识,也可应用于量子系统相干操纵技术。This paper is motivated by the greater technological importance of studying femtosecond time-resolved coherent anti-Stokes Ramans cattering（ CARS） technique. The study consists of the simultaneous excitement of the vibrational modes,such as 377,416,430 and 449 cm-1in sapphire crystal,using femtosecond time-resolved CARS technique; the subsequent observation of the quantum beat phenomenon presence in coherent coupling as the vibrational relaxation is detected; and the achievement of the Fourier transform of the quantum beat signal. The experiment points to the possible elimination of a complicated laser system due to the use of the ultrabroadband white-light continuum for the Stokes pulse and the application of the temporal chirp characteristics of the white-light continuum. This work might aid in a deeper insight into quantum coherence and a wider applications of coherent controlling technologies of quantum system.

关 键 词：量子拍频 飞秒时间分辨相干反斯托克斯拉曼散射 超连续白光 振动弛豫 

分 类 号：O433.5[机械工程—光学工程]