Question: 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.
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
Energy, eV 2 0 Pump radiation Pump E3 levels Fast (nonradiative) transition E Metastable state Laser output 694.3 nm E Ground state
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Where E 2 is the lower energy level of the doublet and E 2 is the upper Let T 300K so kT 0... View full answer
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