- #36

Niles

- 1,866

- 0

Thanks. I thought I understood it, until I read through the derivation of the gain in a 3-level system and saw the attached graph -- note that in the derivation they do not take into account a lossy cavity. But still I believe that the graph contradicts the main point we have been talking about: That the gain is clamped. Don't you agree with me on this one?

The gain increases with pump, until lasing starts. All good so far. But after lasing starts (gain > 0), then gain = loss, but I don't see that *anywhere* on the graph. According to them, gain increases linearly for low pump power, and saturates at some point. So they talk about it as if they have command over the specific value of the gain, we didn't in our discussion -- there it was either nothing or equal to losses.

The gain increases with pump, until lasing starts. All good so far. But after lasing starts (gain > 0), then gain = loss, but I don't see that *anywhere* on the graph. According to them, gain increases linearly for low pump power, and saturates at some point. So they talk about it as if they have command over the specific value of the gain, we didn't in our discussion -- there it was either nothing or equal to losses.

#### Attachments

Last edited: