# Homework Help: Fabry perot Laser

1. Sep 6, 2011

### zak8000

1. The problem statement, all variables and given/known data
Consider a Fabry-Perot laser, length 0.1m, with an unsaturated gain coefficient, $\gammao$=1m-1

one of the mirrors of the Fabry-Perot cavity is perfectly reflecting, the other reflects 95% of the light and transmits 5%. wit the aid of a brief calculation explain why steady state laser oscillation is expected?

i had no idea on how to approach this question so i did some research and i found this book kind of helpful under this link:
http://books.google.co.nz/books?id=...rip gain greater than round trip loss&f=false

2. Relevant equations

after reading a chapter in the book the steady state condition is R1R2exp(2aL-j2wL/c)=1

3. The attempt at a solution

since i am not given any frequency value i only solved the condition for the round trip amplitude coefficent and the way i calculated it was R1R2exp(2aL)=1 --->0.95exp(2*1*0.1)=1.15