What is the significance of light-shifted ground states in sub-doppler cooling?

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I'm a second year physics undergraduate and am currently taking part in a summer studentship programme where I spend a few weeks working in the cold atoms lab at my university. I've been looking into sub-doppler cooling, and one text in particular keeps referring to 'light-shifted ground states' or 'light shifted energies', but does not explain what this means. 'Light shift' also seems to be used as a noun at times.

I was hoping someone might be able to explain to me what this means, as I can't find an explanation online anywhere.

Thanks very much!
 
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I think they just mean that the frequency of the light is shifted upon observation due to relative motion. Red shift or Blue shift. The Doppler effect.
 

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