Lasers - energy per round-trip

[yoni3468]

Hi all,

I would like to ask a question regarding lasers and resonators:

If I have a solid-state laser, and I know the following information:

The gain medium diameter, it's length, population difference between the energy levels, gamma-alpha (r-a), broadening, wavelength, spontaneous emission rate, refraction coefficient, and the mirrors' reflectivity (R1=1 and R2=0.9);

How can I calculate the energy that is being added to the laser beam per round-trip within the resonator?

 

[yoni3468]

I thought a bit about it, and I have a theory:

If the cavity has already reached it's steady state, the energy must remain constant.
That means that if I'm looking for the energy increase, it must be equal to the losses.

What do you think?