Abstract

Alexandrite (Cr³⁺:BeAl₂O₄) is a broadly-tunable vibronic solid-state laser material allowing laser emission mainly in the near-IR wavelength region with a peak centered around 750 nm [1]. Nevertheless, it allows operation at the electronic transitions distinguished by sharp lines around 680 nm, known as R-lines from ruby laser, which is of great interest for spectroscopic purposes.

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