【作者】 朱长军； 翟学军； 薛兵；

【Author】 Zhu Changjun,Zhai Xuejun,Xue Bing Department of Physics,School of Science,Xi’an Polytechnic University,Xi’an 710048,China

【机构】 西安工程大学理学院物理系；

【摘要】 利用宽带的钛宝石飞秒激光脉冲相干激发铷原子中两个耦合的四波混频过程,采用泵浦-探测方法得到了四波混频信号强度随脉冲延迟的变化。通过含时傅里叶变换,从时域四波混频信号中得到7s和5d能级之间量子拍的动力学演化过程。结果表明,量子拍的动力学特性主要依赖于双原子准分子Rb₂^*的解离过程,通过量子拍的动力学特性曲线得到了Rb₂^*的解离时间。更多还原

【Abstract】 Femtosecond Ti:sapphire laser pulses with broad bandwidth were employed to excite coherently two coupled four-wave-mixing processes in Rb.Time varying four-wave-mixing signals from the two coupled four-wave-mixing processes in Rb were obtained using a pump-probe scheme.Dynamic characteristics of the quantum beat between 7s and 5d states were recovered from the time domain four-wave-mixing signals using time-dependent Fourier transform.The results show that,the quantum beat dynamic characteristics depend mainly on the dissociation of the diatomic eximer Rb₂^*, and the dissociation time of Rb₂^* is obtained by using the quantum beat dynamic characteristic curves.更多还原