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1·We have studied the level crossing effect in degenerate four-wave mixing and compared it with the level crossing effect in resonance fluorescence.

研究了简并四波混频的能级交叉效应，并与共振荧光的能级交叉效应比较。

2·This paper reveals that the group velocity of a weak laser probe field can be manipulated by controlling the intensity of the driving field applied to a near-degenerate closed three-level V system.

在近简并的封闭三能级V系统中，一束弱激光探测场的群速度可以通过控制一单色驱动场的强度实现慢光速到超光速的转换。

3·Thus the second-lowest energy level of the particle in a cube is threefold degenerate.

于是立方体中的第二最低能级是三重简并的。

4·The stimulated photon echo in degenerate two-level system has been studied.

研究了简并二能级系统的受激光子回波效应。

5·We have studied the saturation effect of degenerate four-wave mixing in Doppler-broadened two-level system.

我们研究了多普勒增宽的二能级系统中，简并四波混频的饱和效应。

6·In this paper, the time-resolved degenerate four-wave mixing in two-level system is treated rigorously with the density-matrix method.

本文用密度矩阵方法严格处理了在共振情况下二能级系统时间分辨简并四波混频问题。

7·Phase conjugation of backward-and forward-wave produced by degenerate four-wave mixing using a nearly resonantly enhanced nonlinearity in four-level organic dye solutions was investigated.

研究了近共振增强的四能级系统有机染料溶液中简并的四波混频后向反射波及前向波的位相复共轭特性。