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研究了一种基于单晶体的可调谐超荧光产生机理,在一个偏硼酸钡(BBO)晶体中实现了飞秒脉冲倍频过程和光参量产生过程.实验中采用kHz高功率钛宝石激光系统输出的飞秒脉冲光倍频后的蓝光作为抽运光,获得了可调谐范围为480—530nm参量超荧光光谱输出.理论上分析了这种超荧光产生机理,并利用放大传递函数模拟出参量超荧光环的产生过程.结果表明,在一个BBO晶体中,当抽运光源输出光入射晶体角度同时满足倍频相位匹配角和非共线光参量产生相位匹配角时可产生参量超荧光环,通过微调相位匹配角可控制参量超荧光光谱调谐输出.该理论和实验研究为控制参量超荧光和量子纠缠态的产生提供了理论依据,对于量子成像和量子通讯等领域的发展具有重要意义.
A tunable hyperfluorescence mechanism based on single crystal was studied in which the femtosecond pulse multiplication process and the optical parametric process were realized in a barium metaborate (BBO) crystal.Experiments using a high power Ti: sapphire laser output system fly The pulsed light with the pulsed frequency of second pulse was used as the pump light to obtain the super-fluorescence spectral output with a tunable range of 480-530nm.The mechanism of this superfluorescence was theoretically analyzed and the superfluorescent ring The results show that in a BBO crystal, a parametric hyperfluorescent ring can be generated when the output light angle of the pumping light source meets the requirements of the phase matching angle of the harmonic multiplier and the non-collinear optical parameters. By fine tuning the phase The matching angle can control the hyperfluorescence spectrum of the output of the spectrometer.The theoretical and experimental studies provide theoretical basis for controlling the hyperfluorescence and quantum entangled states of the parameters and are of great significance for the development of quantum imaging and quantum communication.