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The excited-state absorption cross section₂₀ (E) in the gain wavelength region of alexandrite has been determined and is shown to limit the vibronic laser range at both high and low energy. The maximum in vibronic laser emission is due to a minimum in₂₀ (E) near 13 000 cm-1. ₂₀ (E) is less than 10-20cm2between 12 000 and 14 000 cm-1.
Shand et al. (Thu,) studied this question.