About laser physics

  • Thread starter KFC
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KFC
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What does saturation mean in laser physics? I am reading some material on two-level system, in which it mentions something call "saturating pump field", what does this field mean?
 

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Andy Resnick
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In the two-state approximation (ground state and excited state), a pump field can move atoms from the ground state to excited state. When the efficiency of pumping goes to zero (which is reached at a 50-50 population distribution, IIRC), the laser medium is said to be 'saturated'- no additional atoms can be moved into the excited state without some returning to the ground state.

Population inversion (lasing with gain) requires at least three states.
 

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