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Diffstat (limited to 'source/know/concept/salt-equation/index.md')
| -rw-r--r-- | source/know/concept/salt-equation/index.md | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/source/know/concept/salt-equation/index.md b/source/know/concept/salt-equation/index.md index 77f4755..d7f8ef3 100644 --- a/source/know/concept/salt-equation/index.md +++ b/source/know/concept/salt-equation/index.md @@ -268,9 +268,10 @@ it emits photons without any significant light amplification taking place. Upon gradually increasing the pump $$D_0$$ in the active region, all $$\Imag(k_n)$$ become less negative, until one hits the real axis $$\Imag(k_n) = 0$$, -at which point that mode starts lasing, -i.e. the Light gets Amplified by [Stimulated Emission](/know/concept/einstein-coefficients/) (LASE). -After that, $$D_0$$ can be increased even further until some other $$k_n$$ become real. +at which point that mode starts *lasing*: +its Light gets Amplified by [Stimulated Emission](/know/concept/einstein-coefficients/) of Radiation (LASER). +After that, $$D_0$$ can be increased even further until some other $$k_n$$ become real, +so there are multiple active modes competing for charge carriers. Below threshold (i.e. before any mode is lasing), the problem is linear in $$\Psi_n$$, but above threshold it is nonlinear via $$h(\vb{x})$$. |