Resolutions of degenerate four-wave mixing with forward and phase-conjugate configurations (FDFWM and PCDFWM) are investigated and compared theoretically and experimentally in hot rubidium (Rb) atomic vapor.The theore...Resolutions of degenerate four-wave mixing with forward and phase-conjugate configurations (FDFWM and PCDFWM) are investigated and compared theoretically and experimentally in hot rubidium (Rb) atomic vapor.The theoretical simulations indicate that PCDFWM is of much higher resolution than FDFWM.The resolution of PCDFWM is less dependent on Doppler broadening.The experimental results are in good agreement with the theoretical expectation.PCDFWM can resolve the hyperfine transitions and crossover resonances of 87 Rb which cannot be achieved by FDFWM.Additionally,with sample temperature increasing,the linewidth of FDFWM spectrum obviously broadens.In comparison,no obvious broadening can be observed in the PCDFWM spectrum.展开更多
In trace Li analysis with degenerate four-wave mixing （DFWM） method, acid anions and major metallic elements are dominant interferences in Li-eontaining samples. To better use DFWM technique to analyze trace Li in a...In trace Li analysis with degenerate four-wave mixing （DFWM） method, acid anions and major metallic elements are dominant interferences in Li-eontaining samples. To better use DFWM technique to analyze trace Li in actual samples, we study their effects on Li DFWM signal intensity. It is found that K, Cs, and Ni can enhance the Li DFWM signal, SO4^2, PO^34-, Cl-, and Ca can cause significant suppression, and NO3-, Mg, Ba, Sr, and Na almost have no effects. Finally, we use HaBOa to eliminate the depressive effects of chlorides on Li DFWM signal. The result is also of reference in other trace elements analysis with DFWM.展开更多
基金Supported by the National Basic Research Program of China under Grant No 2010CB434811the National Natural Science Foundation of China under Grant No 10874139+1 种基金the Ph.D.Program Foundation of Ministry of Education of China under Grant No 200806970002the Northwest University Innovation Fund for Postgraduate Students under Grant No 09YJC26.
文摘Resolutions of degenerate four-wave mixing with forward and phase-conjugate configurations (FDFWM and PCDFWM) are investigated and compared theoretically and experimentally in hot rubidium (Rb) atomic vapor.The theoretical simulations indicate that PCDFWM is of much higher resolution than FDFWM.The resolution of PCDFWM is less dependent on Doppler broadening.The experimental results are in good agreement with the theoretical expectation.PCDFWM can resolve the hyperfine transitions and crossover resonances of 87 Rb which cannot be achieved by FDFWM.Additionally,with sample temperature increasing,the linewidth of FDFWM spectrum obviously broadens.In comparison,no obvious broadening can be observed in the PCDFWM spectrum.
基金supported by the National "973" Plan Preliminary Study Special of China(Nos.2012CB723407 and 2010CB434811)the Northwest University Science Foundation(No.13NW12)the Shaanxi Provincial Department of Education Project(No.12JK0599)
文摘In trace Li analysis with degenerate four-wave mixing （DFWM） method, acid anions and major metallic elements are dominant interferences in Li-eontaining samples. To better use DFWM technique to analyze trace Li in actual samples, we study their effects on Li DFWM signal intensity. It is found that K, Cs, and Ni can enhance the Li DFWM signal, SO4^2, PO^34-, Cl-, and Ca can cause significant suppression, and NO3-, Mg, Ba, Sr, and Na almost have no effects. Finally, we use HaBOa to eliminate the depressive effects of chlorides on Li DFWM signal. The result is also of reference in other trace elements analysis with DFWM.
