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。

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.

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然后从色散介质中相速度与群速度的关系，讨论了相速度和群速度超光速的可能性。

Then the possibility of larger phase velocity and group velocity than light speed in dispersive medium is discussed.

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然后从色散介质中相速度与群速度的关系，讨论了相速度和群速度超光速的可能性。

Then the possibility of larger phase velocity and group velocity than light speed in dispersive medium is discussed.

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