Question
(a) What energy photons can pump chromium atoms in a ruby laser from the ground state to its second and third excited states? (b) What are the wavelengths of these photons? Verify that they are in the visible part of the spectrum.
1. $\textrm{E}_2 = 2.3 \textrm{ eV}$
$\textrm{E}_3 = 3.0 \textrm{ eV}$
2. $\lambda_2 = 540 \textrm{ nm}.$ This is green.
$\lambda_3 = 410 \textrm{ nm}$. This is violet.
Solution Video