Notice in Figure 9 33d that the level E 2 in Cr 3 is a doublet, the pair of states being separated by only 0 0036 eV (a) Assume that all of the Cr 3 ions in a certain laser are in the three states E 1 and E 2 (doublet) and compute the relative populations of these levels (b) If only the lower state...

Where E 2 is the lower energy level of the doublet and E 2 is the upper Let T 300K so kT 0 ...

Notice in Figure 9-33d that the level E 2 in Cr 3+ is a doublet, the pair

Question:

Notice in Figure 9-33d that the level E₂ in Cr³⁺ is a doublet, the pair of states being separated by only 0.0036 eV.

(a) Assume that all of the Cr³⁺ ions in a certain laser are in the three states E₁ and E₂ (doublet) and compute the relative populations of these levels.
(b) If only the lower state of the E₂ doublet can produce laser light but both levels must be pumped together, determine the pumping power necessary for laser action to occur. The density of states (degeneracy) of level E₁ is 4 and for each of the E₂ levels is 2.

Figure 9-33d