(adsbygoogle = window.adsbygoogle || []).push({}); 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)-A_{21}N2

dN1/dt=-B*p(w)(N1-N2)+A_{21}N2

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

**Physics Forums | Science Articles, Homework Help, Discussion**

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

# Homework Help: Two level laser

Can you offer guidance or do you also need help?

Draft saved
Draft deleted

**Physics Forums | Science Articles, Homework Help, Discussion**