Hi(adsbygoogle = window.adsbygoogle || []).push({});

At continuous-wave oscillation the gain is equal to the threshold gain, i.e. g = g_{threshold}. Now in my book, I have the following expression for the steady-state population-inversion for a three-level laser

N_{2, steady state}- N_{1, steady state}= (P-Γ_{12})/(P+Γ_{12})N_{T}

where N_{T}=N_{1, steady state}+N_{2, steady state}, P is the pump rate and Γ_{12}is the rate at which level 2 decays into level 1. Now my question is: If at CW-oscillation g=g_{t}, then why is it that we can change N_{2, steady state}- N_{1, steady state}(and thereby the gain) in a three-level laser at steady-state? Isn't this a contradiction?

**Physics Forums - The Fusion of Science and Community**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Laser: CW-oscillation in a 3-level laser

Loading...

Similar Threads - Laser oscillation level | Date |
---|---|

A Laser beam represented with complex conjugate? | Jan 11, 2018 |

B About Laser Production | Oct 30, 2017 |

I How do I make an atomic oscillation? | Oct 17, 2017 |

I Temperature impact on laser emission | Feb 12, 2017 |

I Laser gain location? | Nov 20, 2016 |

**Physics Forums - The Fusion of Science and Community**