What is the AC Stark effect?

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Nusc
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Can someone please give me a brief description of the AC Stark effect? What is it ?
 
Nusc said:
Can someone please give me a brief description of the AC Stark effect? What is it ?
It's the Autler-Townes effect. Apply constant electric filed to an energy level would result stark effect. Apply sinusoidal Electric filed would result AC stark effect.