CAJ | 학술논문

基于远失谐的四波混频过程,在实验上得到了放大的探针光脉冲和产生的共轭光脉冲的同时慢光传输,并通过改变抽运光和探针光之间的双光子失谐实现了群速度的同时操控.首先在连续光模式下,研究了入射探针光和新产生共轭光的增益与单光子失谐之间的变化关系.随着单光子失谐在一定范围内加大,探针光和共轭光的增益均表现出先增加后减小的变化趋势.在具有增益特性的基础上,分别采用6μs和365 ns探针光脉冲,研究了慢光的延迟时间和双光子失谐的关系.对6μs的探针光,得到探针和共轭光脉冲的最大延迟分别为2.1μs和1.9μs,对应的群速度分别约为0.000119c和0.000132c,相应延迟比分别为0.35和0.32.对365 ns探针光,探针和共轭光脉冲的最大延迟分别为756 ns和670 ns,对应的群速度分别约为0.00033c和0.00037c,相应延迟比提高到2.07和1.83.
기우원실해적사파혼빈과정,재실험상득도료방대적탐침광맥충화산생적공액광맥충적동시만광전수,병통과개변추운광화탐침광지간적쌍광자실해실현료군속도적동시조공.수선재련속광모식하,연구료입사탐침광화신산생공액광적증익여단광자실해지간적변화관계.수착단광자실해재일정범위내가대,탐침광화공액광적증익균표현출선증가후감소적변화추세.재구유증익특성적기출상,분별채용6μs화365 ns탐침광맥충,연구료만광적연지시간화쌍광자실해적관계.대6μs적탐침광,득도탐침화공액광맥충적최대연지분별위2.1μs화1.9μs,대응적군속도분별약위0.000119c화0.000132c,상응연지비분별위0.35화0.32.대365 ns탐침광,탐침화공액광맥충적최대연지분별위756 ns화670 ns,대응적군속도분별약위0.00033c화0.00037c,상응연지비제고도2.07화1.83.
Based on the far off-resonant four-wave mixing process, the slow light propagations of the amplified probe and generated conjugate pulses are obtained experimentally. Simultaneous manipulations of group velocity are realized by changing the two-photon detuning between the pump light and the probe light. The dependences of gains of the injected probe and generated conjugate light on the one-photon detuning for continuous wave mode are studied at different cesium vapor temperatures and pump light powers. It is shown that the maximum of gains occurs at the proper Raman one-photon detuning. The dependence of delay time on the two-photon detuning is measured using the 6 μs and 365 ns probe pulses, respectively. For the 6 μs input probe pulse, the maximum delay times of the probe and the conjugate pulses are 2.1 μs and 1.9 μs with the fractional delays of 0.35 and 0.32, respectively, corresponding to 0.000119c and 0.000132c group velocity. The high fractional delays of 2.07 and 1.83 with the maximum delay times of 756 ns and 670 ns for the 365 ns input pulse are obtained.