Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Two level laser

  1. Sep 5, 2011 #1
    1. The problem statement, all variables and given/known data
    consider a two level atomic system , solve the rate equations for the two levels to find expressions for N1(t) and N2(t) in terms of the intial populations N1(0) and N2(0)


    2. Relevant equations

    i have been able to derive the rate equations as:

    dN2/dt=B*p(w)(N1-N2)-A21N2
    dN1/dt=-B*p(w)(N1-N2)+A21N2

    now all i need to do is integrate each equation to find expressions for N1(t) and N2(t) but i have failed at integrating these frist order linear differential equations
    3. The attempt at a solution
     
  2. jcsd
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted