Make a rough estimate of the amount of energy that can be delivered by a ruby laser whose crystal is 5.0 mm in diameter and 0.050 m long. Assume the pulse of light lasts 5.0 × 10^-6s. The density of aluminum oxide (Al₂O₃) is 3.7 × 10³kg/m³. Use the data in the discussion of Fig. 13.7 and the fact that the chromium ions make a 1.79 eV lasing transition. How much power is available per pulse?

Fig. 13.7

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Flashtube Ruby Beam Trigger electrode Pumping energy Active medium Miror Partial mirror