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Effect of inversion sites on alexandrite laser efficiency

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Abstract

There are two kinds of ion site for the chromium in alexandrite. The Cr3+ ions at the mirror sites are electric dipole allowed and contribute to the laser action. The inversion sites constitute ~25 % of the chromium density in the crystal and are relatively long-lived (40 msec). Excitation spectra indicate that the 4T2 absorption peak of the inversion sites is ~500 nm, where the mirror site absorption is at its minimum.

© 1985 Optical Society of America

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